Package org.apache.maven.plugin.invoker

Source Code of org.apache.maven.plugin.invoker.AbstractInvokerMojo

package org.apache.maven.plugin.invoker;

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*  http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugin.invoker.model.BuildJob;
import org.apache.maven.plugin.invoker.model.io.xpp3.BuildJobXpp3Writer;
import org.apache.maven.model.Model;
import org.apache.maven.model.Profile;
import org.apache.maven.shared.invoker.InvocationRequest;
import org.apache.maven.shared.invoker.DefaultInvocationRequest;
import org.apache.maven.shared.invoker.MavenCommandLineBuilder;
import org.apache.maven.shared.invoker.CommandLineConfigurationException;
import org.apache.maven.shared.invoker.InvocationResult;
import org.apache.maven.shared.invoker.MavenInvocationException;
import org.apache.maven.shared.invoker.Invoker;
import org.apache.maven.project.MavenProject;
import org.apache.maven.settings.Settings;
import org.codehaus.plexus.util.StringUtils;
import org.codehaus.plexus.util.ReaderFactory;
import org.codehaus.plexus.util.FileUtils;
import org.codehaus.plexus.util.DirectoryScanner;
import org.codehaus.plexus.util.IOUtil;
import org.codehaus.plexus.util.InterpolationFilterReader;
import org.codehaus.plexus.util.WriterFactory;
import org.codehaus.plexus.interpolation.Interpolator;
import org.codehaus.plexus.interpolation.RegexBasedInterpolator;
import org.codehaus.plexus.interpolation.MapBasedValueSource;
import org.codehaus.plexus.interpolation.InterpolationException;

import java.io.IOException;
import java.io.File;
import java.io.Reader;
import java.io.FileOutputStream;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.BufferedReader;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;
import java.util.Properties;
import java.util.TreeSet;
import java.util.Map;
import java.util.LinkedHashMap;
import java.util.Arrays;
import java.util.HashMap;
import java.util.StringTokenizer;
import java.util.Collections;
import java.util.Locale;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;

/**
* Provides common code for mojos invoking sub builds.
*
* @author Stephen Connolly
* @since 15-Aug-2009 09:09:29
*/
public abstract class AbstractInvokerMojo
    extends AbstractMojo
{

    /**
     * Flag used to suppress certain invocations. This is useful in tailoring the build using profiles.
     *
     * @parameter expression="${invoker.skip}" default-value="false"
     * @since 1.1
     */
    private boolean skipInvocation;

    /**
     * Flag used to suppress the summary output notifying of successes and failures. If set to <code>true</code>, the
     * only indication of the build's success or failure will be the effect it has on the main build (if it fails, the
     * main build should fail as well). If {@link #streamLogs} is enabled, the sub-build summary will also provide an
     * indication.
     *
     * @parameter default-value="false"
     */
    protected boolean suppressSummaries;

    /**
     * Flag used to determine whether the build logs should be output to the normal mojo log.
     *
     * @parameter expression="${invoker.streamLogs}" default-value="false"
     */
    private boolean streamLogs;

    /**
     * The local repository for caching artifacts. It is strongly recommended to specify a path to an isolated
     * repository like <code>${project.build.directory}/it-repo</code>. Otherwise, your ordinary local repository will
     * be used, potentially soiling it with broken artifacts.
     *
     * @parameter expression="${invoker.localRepositoryPath}" default-value="${settings.localRepository}"
     */
    private File localRepositoryPath;

    /**
     * Directory to search for integration tests.
     *
     * @parameter expression="${invoker.projectsDirectory}" default-value="${basedir}/src/it/"
     */
    private File projectsDirectory;

    /**
     * Base directory where all build reports are written to.
     *
     * @parameter expression="${invoker.reportsDirectory}" default-value="${project.build.directory}/invoker-reports"
     * @since 1.4
     */
    private File reportsDirectory;

    /**
     * A flag to disable the generation of build reports.
     *
     * @parameter expression="${invoker.disableReports}" default-value="false"
     * @since 1.4
     */
    private boolean disableReports;

    /**
     * Directory to which projects should be cloned prior to execution. If not specified, each integration test will be
     * run in the directory in which the corresponding IT POM was found. In this case, you most likely want to configure
     * your SCM to ignore <code>target</code> and <code>build.log</code> in the test's base directory.
     *
     * @parameter
     * @since 1.1
     */
    private File cloneProjectsTo;

    /**
     * Some files are normally excluded when copying the IT projects from the directory specified by the parameter
     * projectsDirectory to the directory given by cloneProjectsTo (e.g. <code>.svn</code>, <code>CVS</code>,
     * <code>*~</code>, etc). Setting this parameter to <code>true</code> will cause all files to be copied to the
     * cloneProjectsTo directory.
     *
     * @parameter default-value="false"
     * @since 1.2
     */
    private boolean cloneAllFiles;

    /**
     * A single POM to build, skipping any scanning parameters and behavior.
     *
     * @parameter expression="${invoker.pom}"
     */
    private File pom;

    /**
     * Include patterns for searching the integration test directory for projects. This parameter is meant to be set
     * from the POM. If this parameter is not set, the plugin will search for all <code>pom.xml</code> files one
     * directory below {@link #projectsDirectory} (i.e. <code>*&#47;pom.xml</code>).<br>
     * <br>
     * Starting with version 1.3, mere directories can also be matched by these patterns. For example, the include
     * pattern <code>*</code> will run Maven builds on all immediate sub directories of {@link #projectsDirectory},
     * regardless if they contain a <code>pom.xml</code>. This allows to perform builds that need/should not depend on
     * the existence of a POM.
     *
     * @parameter
     */
    private List pomIncludes = Collections.singletonList( "*/pom.xml" );

    /**
     * Exclude patterns for searching the integration test directory. This parameter is meant to be set from the POM. By
     * default, no POM files are excluded. For the convenience of using an include pattern like <code>*</code>, the
     * custom settings file specified by the parameter {@link #settingsFile} will always be excluded automatically.
     *
     * @parameter
     */
    private List pomExcludes = Collections.EMPTY_LIST;

    /**
     * Include patterns for searching the projects directory for projects that need to be run before the other projects.
     * This parameter allows to declare projects that perform setup tasks like installing utility artifacts into the
     * local repository. Projects matched by these patterns are implicitly excluded from the scan for ordinary projects.
     * Also, the exclusions defined by the parameter {@link #pomExcludes} apply to the setup projects, too. Default
     * value is: <code>setup*&#47;pom.xml</code>.
     *
     * @parameter
     * @since 1.3
     */
    private List setupIncludes = Collections.singletonList( "setup*/pom.xml" );

    /**
     * The list of goals to execute on each project. Default value is: <code>package</code>.
     *
     * @parameter
     */
    private List goals = Collections.singletonList( "package" );

    /**
     * The name of the project-specific file that contains the enumeration of goals to execute for that test.
     *
     * @parameter expression="${invoker.goalsFile}" default-value="goals.txt"
     * @deprecated As of version 1.2, the key <code>invoker.goals</code> from the properties file specified by the
     *             parameter {@link #invokerPropertiesFile} should be used instead.
     */
    private String goalsFile;

    /**
     * @component
     */
    private Invoker invoker;

    /**
     * Relative path of a selector script to run prior in order to decide if the build should be executed. This script
     * may be written with either BeanShell or Groovy. If the file extension is omitted (e.g. <code>selector</code>),
     * the plugin searches for the file by trying out the well-known extensions <code>.bsh</code> and <code>.groovy</code>.
     * If this script exists for a particular project but returns any non-null value different from <code>true</code>,
     * the corresponding build is flagged as skipped. In this case, none of the pre-build hook script,
     * Maven nor the post-build hook script will be invoked. If this script throws an exception, the corresponding
     * build is flagged as in error, and none of the pre-build hook script, Maven not the post-build hook script will
     * be invoked.
     *
     * @parameter expression="${invoker.selectorScript}" default-value="selector"
     * @since 1.5
     */
    private String selectorScript;

    /**
     * Relative path of a pre-build hook script to run prior to executing the build. This script may be written with
     * either BeanShell or Groovy (since 1.3). If the file extension is omitted (e.g. <code>prebuild</code>), the plugin
     * searches for the file by trying out the well-known extensions <code>.bsh</code> and <code>.groovy</code>. If this
     * script exists for a particular project but returns any non-null value different from <code>true</code> or throws
     * an exception, the corresponding build is flagged as a failure. In this case, neither Maven nor the post-build
     * hook script will be invoked.
     *
     * @parameter expression="${invoker.preBuildHookScript}" default-value="prebuild"
     */
    private String preBuildHookScript;

    /**
     * Relative path of a cleanup/verification hook script to run after executing the build. This script may be written
     * with either BeanShell or Groovy (since 1.3). If the file extension is omitted (e.g. <code>verify</code>), the
     * plugin searches for the file by trying out the well-known extensions <code>.bsh</code> and <code>.groovy</code>.
     * If this script exists for a particular project but returns any non-null value different from <code>true</code> or
     * throws an exception, the corresponding build is flagged as a failure.
     *
     * @parameter expression="${invoker.postBuildHookScript}" default-value="postbuild"
     */
    private String postBuildHookScript;

    /**
     * Location of a properties file that defines CLI properties for the test.
     *
     * @parameter expression="${invoker.testPropertiesFile}" default-value="test.properties"
     */
    private String testPropertiesFile;

    /**
     * Common set of test properties to pass in on each IT's command line, via -D parameters.
     *
     * @parameter
     * @deprecated As of version 1.1, use the {@link #properties} parameter instead.
     */
    private Properties testProperties;

    /**
     * Common set of properties to pass in on each project's command line, via -D parameters.
     *
     * @parameter
     * @since 1.1
     */
    private Map properties;

    /**
     * Whether to show errors in the build output.
     *
     * @parameter expression="${invoker.showErrors}" default-value="false"
     */
    private boolean showErrors;

    /**
     * Whether to show debug statements in the build output.
     *
     * @parameter expression="${invoker.debug}" default-value="false"
     */
    private boolean debug;

    /**
     * Suppress logging to the <code>build.log</code> file.
     *
     * @parameter expression="${invoker.noLog}" default-value="false"
     */
    private boolean noLog;

    /**
     * List of profile identifiers to explicitly trigger in the build.
     *
     * @parameter
     * @since 1.1
     */
    private List profiles;

    /**
     * List of properties which will be used to interpolate goal files.
     *
     * @parameter
     * @since 1.1
     * @deprecated As of version 1.3, the parameter {@link #filterProperties} should be used instead.
     */
    private Properties interpolationsProperties;

    /**
     * A list of additional properties which will be used to filter tokens in POMs and goal files.
     *
     * @parameter
     * @since 1.3
     */
    private Map filterProperties;

    /**
     * The Maven Project Object
     *
     * @parameter expression="${project}"
     * @required
     * @readonly
     * @since 1.1
     */
    private MavenProject project;

    /**
     * A comma separated list of project names to run. Specify this parameter to run individual tests by file name,
     * overriding the {@link #setupIncludes}, {@link #pomIncludes} and {@link #pomExcludes} parameters. Each pattern you
     * specify here will be used to create an include pattern formatted like
     * <code>${projectsDirectory}/<i>pattern</i></code>, so you can just type
     * <code>-Dinvoker.test=FirstTest,SecondTest</code> to run builds in <code>${projectsDirectory}/FirstTest</code> and
     * <code>${projectsDirectory}/SecondTest</code>.
     *
     * @parameter expression="${invoker.test}"
     * @since 1.1
     */
    private String invokerTest;

    /**
     * The name of the project-specific file that contains the enumeration of profiles to use for that test. <b>If the
     * file exists and is empty no profiles will be used even if the parameter {@link #profiles} is set.</b>
     *
     * @parameter expression="${invoker.profilesFile}" default-value="profiles.txt"
     * @since 1.1
     * @deprecated As of version 1.2, the key <code>invoker.profiles</code> from the properties file specified by the
     *             parameter {@link #invokerPropertiesFile} should be used instead.
     */
    private String profilesFile;

    /**
     * Path to an alternate <code>settings.xml</code> to use for Maven invocation with all ITs. Note that the
     * <code>&lt;localRepository&gt;</code> element of this settings file is always ignored, i.e. the path given by the
     * parameter {@link #localRepositoryPath} is dominant.
     *
     * @parameter expression="${invoker.settingsFile}"
     * @since 1.2
     */
    private File settingsFile;

    /**
     * The <code>MAVEN_OPTS</code> environment variable to use when invoking Maven. This value can be overridden for
     * individual integration tests by using {@link #invokerPropertiesFile}.
     *
     * @parameter expression="${invoker.mavenOpts}"
     * @since 1.2
     */
    private String mavenOpts;

    /**
     * The home directory of the Maven installation to use for the forked builds. Defaults to the current Maven
     * installation.
     *
     * @parameter expression="${invoker.mavenHome}"
     * @since 1.3
     */
    private File mavenHome;

    /**
     * The <code>JAVA_HOME</code> environment variable to use for forked Maven invocations. Defaults to the current Java
     * home directory.
     *
     * @parameter expression="${invoker.javaHome}"
     * @since 1.3
     */
    private File javaHome;

    /**
     * The file encoding for the pre-/post-build scripts and the list files for goals and profiles.
     *
     * @parameter expression="${encoding}" default-value="${project.build.sourceEncoding}"
     * @since 1.2
     */
    private String encoding;

    /**
     * The current user system settings for use in Maven.
     *
     * @parameter expression="${settings}"
     * @required
     * @readonly
     * @since 1.2
     */
    private Settings settings;

    /**
     * A flag whether the test class path of the project under test should be included in the class path of the
     * pre-/post-build scripts. If set to <code>false</code>, the class path of script interpreter consists only of
     * the <a href="dependencies.html">runtime dependencies</a> of the Maven Invoker Plugin. If set the
     * <code>true</code>, the project's test class path will be prepended to the interpreter class path. Among
     * others, this feature allows the scripts to access utility classes from the test sources of your project.
     *
     * @parameter expression="${invoker.addTestClassPath}" default-value="false"
     * @since 1.2
     */
    private boolean addTestClassPath;

    /**
     * The test class path of the project under test.
     *
     * @parameter default-value="${project.testClasspathElements}"
     * @readonly
     */
    private List testClassPath;

    /**
     * The name of an optional project-specific file that contains properties used to specify settings for an individual
     * Maven invocation. Any property present in the file will override the corresponding setting from the plugin
     * configuration. The values of the properties are filtered and may use expressions like
     * <code>${project.version}</code> to reference project properties or values from the parameter
     * {@link #filterProperties}. The snippet below describes the supported properties:
     *
     * <pre>
     * # A comma or space separated list of goals/phases to execute, may
     * # specify an empty list to execute the default goal of the IT project
     * invoker.goals = clean install
     *
     * # Optionally, a list of goals to run during further invocations of Maven
     * invoker.goals.2 = ${project.groupId}:${project.artifactId}:${project.version}:run
     *
     * # A comma or space separated list of profiles to activate
     * invoker.profiles = its,jdk15
     *
     * # The path to an alternative POM or base directory to invoke Maven on, defaults to the
     * # project that was originally specified in the plugin configuration
     * # Since plugin version 1.4
     * invoker.project = sub-module
     *
     * # The value for the environment variable MAVEN_OPTS
     * invoker.mavenOpts = -Dfile.encoding=UTF-16 -Xms32m -Xmx256m
     *
     * # Possible values are &quot;fail-fast&quot; (default), &quot;fail-at-end&quot; and &quot;fail-never&quot;
     * invoker.failureBehavior = fail-never
     *
     * # The expected result of the build, possible values are &quot;success&quot; (default) and &quot;failure&quot;
     * invoker.buildResult = failure
     *
     * # A boolean value controlling the aggregator mode of Maven, defaults to &quot;false&quot;
     * invoker.nonRecursive = true
     *
     * # A boolean value controlling the network behavior of Maven, defaults to &quot;false&quot;
     * # Since plugin version 1.4
     * invoker.offline = true
     *
     * # The path to the properties file from which to load system properties, defaults to the
     * # filename given by the plugin parameter testPropertiesFile
     * # Since plugin version 1.4
     * invoker.systemPropertiesFile = test.properties
     *
     * # An optional human friendly name for this build job to be included in the build reports.
     * # Since plugin version 1.4
     * invoker.name = Test Build 01
     *
     * # An optional description for this build job to be included in the build reports.
     * # Since plugin version 1.4
     * invoker.description = Checks the support for build reports.
     *
     * # A comma separated list of JRE versions on which this build job should be run.
     * # Since plugin version 1.4
     * invoker.java.version = 1.4+, !1.4.1, 1.7-
     *
     * # A comma separated list of OS families on which this build job should be run.
     * # Since plugin version 1.4
     * invoker.os.family = !windows, unix, mac
     *
     * # A comma separated list of Maven versions on which this build should be run.
     * # Since plugin version 1.5
     * invoker.maven.version = 2.0.10+, !2.1.0, !2.2.0
     * </pre>
     *
     * @parameter expression="${invoker.invokerPropertiesFile}" default-value="invoker.properties"
     * @since 1.2
     */
    private String invokerPropertiesFile;
   
    /**
     * flag to enable show mvn version used for running its (cli option : -V,--show-version )
     * @parameter expression="${invoker.showVersion}" default-value="false"
     * @since 1.4
     */
    private boolean showVersion;
   
    /**
     * The scripter runner that is responsible to execute hook scripts.
     */
    private ScriptRunner scriptRunner;

    /**
     * A string used to prefix the file name of the filtered POMs in case the POMs couldn't be filtered in-place (i.e.
     * the projects were not cloned to a temporary directory), can be <code>null</code>. This will be set to
     * <code>null</code> if the POMs have already been filtered during cloning.
     */
    private String filteredPomPrefix = "interpolated-";

    /**
     * The format for elapsed build time.
     */
    private final DecimalFormat secFormat = new DecimalFormat( "(0.0 s)", new DecimalFormatSymbols( Locale.ENGLISH ) );

    /**
     * Invokes Maven on the configured test projects.
     *
     * @throws org.apache.maven.plugin.MojoExecutionException If the goal encountered severe errors.
     * @throws org.apache.maven.plugin.MojoFailureException If any of the Maven builds failed.
     */
    public void execute()
        throws MojoExecutionException, MojoFailureException
    {
        if ( skipInvocation )
        {
            getLog().info( "Skipping invocation per configuration."
                + " If this is incorrect, ensure the skipInvocation parameter is not set to true." );
            return;
        }

        BuildJob[] buildJobs;
        if ( pom != null )
        {
            try
            {
                projectsDirectory = pom.getCanonicalFile().getParentFile();
            }
            catch ( IOException e )
            {
                throw new MojoExecutionException( "Failed to discover projectsDirectory from pom File parameter."
                    + " Reason: " + e.getMessage(), e );
            }

            buildJobs = new BuildJob[]{ new BuildJob( pom.getName(), BuildJob.Type.NORMAL )};
        }
        else
        {
            try
            {
                buildJobs = getBuildJobs();
            }
            catch ( final IOException e )
            {
                throw new MojoExecutionException( "Error retrieving POM list from includes, excludes, "
                                + "and projects directory. Reason: " + e.getMessage(), e );
            }
        }


        if ( ( buildJobs == null ) || ( buildJobs.length < 1 ) )
        {
            getLog().info( "No projects were selected for execution." );
            return;
        }

        if ( StringUtils.isEmpty( encoding ) )
        {
            getLog().warn(
                           "File encoding has not been set, using platform encoding " + ReaderFactory.FILE_ENCODING
                               + ", i.e. build is platform dependent!" );
        }

        scriptRunner = new ScriptRunner( getLog() );
        scriptRunner.setScriptEncoding( encoding );
        scriptRunner.setGlobalVariable( "localRepositoryPath", localRepositoryPath );
        scriptRunner.setClassPath( addTestClassPath ? testClassPath : null );

        Collection collectedProjects = new LinkedHashSet();
        for ( int i = 0; i < buildJobs.length; i++ )
        {
            collectProjects( projectsDirectory, buildJobs[i].getProject(), collectedProjects, true );
        }

        File projectsDir = projectsDirectory;

        if ( cloneProjectsTo != null )
        {
            cloneProjects( collectedProjects );
            projectsDir = cloneProjectsTo;
        }
        else
        {
            getLog().warn( "Filtering of parent/child POMs is not supported without cloning the projects" );
        }

        runBuilds( projectsDir, buildJobs );

        processResults( new InvokerSession( buildJobs ) );
    }

    /**
     * Processes the results of invoking the build jobs.
     *
     * @param invokerSession The session with the build jobs, must not be <code>null</code>.
     * @throws MojoFailureException If the mojo had failed as a result of invoking the build jobs.
     * @since 1.4
     */
    abstract void processResults( InvokerSession invokerSession )
        throws MojoFailureException;

    /**
     * Creates a new reader for the specified file, using the plugin's {@link #encoding} parameter.
     *
     * @param file The file to create a reader for, must not be <code>null</code>.
     * @return The reader for the file, never <code>null</code>.
     * @throws java.io.IOException If the specified file was not found or the configured encoding is not supported.
     */
    private Reader newReader( File file )
        throws IOException
    {
        if ( StringUtils.isNotEmpty( encoding ) )
        {
            return ReaderFactory.newReader( file, encoding );
        }
        else
        {
            return ReaderFactory.newPlatformReader( file );
        }
    }

    /**
     * Collects all projects locally reachable from the specified project. The method will as such try to read the POM
     * and recursively follow its parent/module elements.
     *
     * @param projectsDir The base directory of all projects, must not be <code>null</code>.
     * @param projectPath The relative path of the current project, can denote either the POM or its base directory,
     *            must not be <code>null</code>.
     * @param projectPaths The set of already collected projects to add new projects to, must not be <code>null</code>.
     *            This set will hold the relative paths to either a POM file or a project base directory.
     * @param included A flag indicating whether the specified project has been explicitly included via the parameter
     *            {@link #pomIncludes}. Such projects will always be added to the result set even if there is no
     *            corresponding POM.
     * @throws org.apache.maven.plugin.MojoExecutionException If the project tree could not be traversed.
     */
    private void collectProjects( File projectsDir, String projectPath, Collection projectPaths, boolean included )
        throws MojoExecutionException
    {
        projectPath = projectPath.replace( '\\', '/' );
        File pomFile = new File( projectsDir, projectPath );
        if ( pomFile.isDirectory() )
        {
            pomFile = new File( pomFile, "pom.xml" );
            if ( !pomFile.exists() )
            {
                if ( included )
                {
                    projectPaths.add( projectPath );
                }
                return;
            }
            if ( !projectPath.endsWith( "/" ) )
            {
                projectPath += '/';
            }
            projectPath += "pom.xml";
        }
        else if ( !pomFile.isFile() )
        {
            return;
        }
        if ( !projectPaths.add( projectPath ) )
        {
            return;
        }
        getLog().debug( "Collecting parent/child projects of " + projectPath );

        Model model = PomUtils.loadPom( pomFile );

        try
        {
            String projectsRoot = projectsDir.getCanonicalPath();
            String projectDir = pomFile.getParent();

            String parentPath = "../pom.xml";
            if ( model.getParent() != null && StringUtils.isNotEmpty( model.getParent().getRelativePath() ) )
            {
                parentPath = model.getParent().getRelativePath();
            }
            String parent = relativizePath( new File( projectDir, parentPath ), projectsRoot );
            if ( parent != null )
            {
                collectProjects( projectsDir, parent, projectPaths, false );
            }

            Collection modulePaths = new LinkedHashSet();

            modulePaths.addAll( model.getModules() );

            for ( Iterator it = model.getProfiles().iterator(); it.hasNext(); )
            {
                Profile profile = (Profile) it.next();
                modulePaths.addAll( profile.getModules() );
            }

            for ( Iterator it = modulePaths.iterator(); it.hasNext(); )
            {
                String modulePath = (String) it.next();
                String module = relativizePath( new File( projectDir, modulePath ), projectsRoot );
                if ( module != null )
                {
                    collectProjects( projectsDir, module, projectPaths, false );
                }
            }
        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "Failed to analyze POM: " + pomFile, e );
        }
    }

    /**
     * Copies the specified projects to the directory given by {@link #cloneProjectsTo}. A project may either be denoted
     * by a path to a POM file or merely by a path to a base directory. During cloning, the POM files will be filtered.
     *
     * @param projectPaths The paths to the projects to clone, relative to the projects directory, must not be
     *            <code>null</code> nor contain <code>null</code> elements.
     * @throws org.apache.maven.plugin.MojoExecutionException If the the projects could not be copied/filtered.
     */
    private void cloneProjects( Collection projectPaths )
        throws MojoExecutionException
    {
        cloneProjectsTo.mkdirs();

        // determine project directories to clone
        Collection dirs = new LinkedHashSet();
        for ( Iterator it = projectPaths.iterator(); it.hasNext(); )
        {
            String projectPath = (String) it.next();
            if ( !new File( projectsDirectory, projectPath ).isDirectory() )
            {
                projectPath = getParentPath( projectPath );
            }
            dirs.add( projectPath );
        }

        boolean filter = false;

        // clone project directories
        try
        {
            filter = !cloneProjectsTo.getCanonicalFile().equals( projectsDirectory.getCanonicalFile() );

            List clonedSubpaths = new ArrayList();

            for ( Iterator it = dirs.iterator(); it.hasNext(); )
            {
                String subpath = (String) it.next();

                // skip this project if its parent directory is also scheduled for cloning
                if ( !".".equals( subpath ) && dirs.contains( getParentPath( subpath ) ) )
                {
                    continue;
                }

                // avoid copying subdirs that are already cloned.
                if ( !alreadyCloned( subpath, clonedSubpaths ) )
                {
                    // avoid creating new files that point to dir/.
                    if ( ".".equals( subpath ) )
                    {
                        String cloneSubdir = relativizePath( cloneProjectsTo, projectsDirectory.getCanonicalPath() );

                        // avoid infinite recursion if the cloneTo path is a subdirectory.
                        if ( cloneSubdir != null )
                        {
                            File temp = File.createTempFile( "pre-invocation-clone.", "" );
                            temp.delete();
                            temp.mkdirs();

                            copyDirectoryStructure( projectsDirectory, temp );

                            FileUtils.deleteDirectory( new File( temp, cloneSubdir ) );

                            copyDirectoryStructure( temp, cloneProjectsTo );
                        }
                        else
                        {
                            copyDirectoryStructure( projectsDirectory, cloneProjectsTo );
                        }
                    }
                    else
                    {
                        File srcDir = new File( projectsDirectory, subpath );
                        File dstDir = new File( cloneProjectsTo, subpath );
                        copyDirectoryStructure( srcDir, dstDir );
                    }

                    clonedSubpaths.add( subpath );
                }
            }
        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "Failed to clone projects from: " + projectsDirectory + " to: "
                + cloneProjectsTo + ". Reason: " + e.getMessage(), e );
        }

        // filter cloned POMs
        if ( filter )
        {
            for ( Iterator it = projectPaths.iterator(); it.hasNext(); )
            {
                String projectPath = (String) it.next();
                File pomFile = new File( cloneProjectsTo, projectPath );
                if ( pomFile.isFile() )
                {
                    buildInterpolatedFile( pomFile, pomFile );
                }
            }
            filteredPomPrefix = null;
        }
    }

    /**
     * Gets the parent path of the specified relative path.
     *
     * @param path The relative path whose parent should be retrieved, must not be <code>null</code>.
     * @return The parent path or "." if the specified path has no parent, never <code>null</code>.
     */
    private String getParentPath( String path )
    {
        int lastSep = Math.max( path.lastIndexOf( '/' ), path.lastIndexOf( '\\' ) );
        return ( lastSep < 0 ) ? "." : path.substring( 0, lastSep );
    }

    /**
     * Copied a directory structure with deafault exclusions (.svn, CVS, etc)
     *
     * @param sourceDir The source directory to copy, must not be <code>null</code>.
     * @param destDir The target directory to copy to, must not be <code>null</code>.
     * @throws java.io.IOException If the directory structure could not be copied.
     */
    private void copyDirectoryStructure( File sourceDir, File destDir )
        throws IOException
    {
        DirectoryScanner scanner = new DirectoryScanner();
        scanner.setBasedir( sourceDir );
        if ( !cloneAllFiles )
        {
            scanner.addDefaultExcludes();
        }
        scanner.scan();

        /*
         * NOTE: Make sure the destination directory is always there (even if empty) to support POM-less ITs.
         */
        destDir.mkdirs();
        String[] includedDirs = scanner.getIncludedDirectories();
        for ( int i = 0; i < includedDirs.length; ++i )
        {
            File clonedDir = new File( destDir, includedDirs[i] );
            clonedDir.mkdirs();
        }

        String[] includedFiles = scanner.getIncludedFiles();
        for ( int i = 0; i < includedFiles.length; ++i )
        {
            File sourceFile = new File( sourceDir, includedFiles[i] );
            File destFile = new File( destDir, includedFiles[i] );
            FileUtils.copyFile( sourceFile, destFile );
        }
    }

    /**
     * Determines whether the specified sub path has already been cloned, i.e. whether one of its ancestor directories
     * was already cloned.
     *
     * @param subpath The sub path to check, must not be <code>null</code>.
     * @param clonedSubpaths The list of already cloned paths, must not be <code>null</code> nor contain
     *            <code>null</code> elements.
     * @return <code>true</code> if the specified path has already been cloned, <code>false</code> otherwise.
     */
    static boolean alreadyCloned( String subpath, List clonedSubpaths )
    {
        for ( Iterator iter = clonedSubpaths.iterator(); iter.hasNext(); )
        {
            String path = (String) iter.next();

            if ( ".".equals( path ) || subpath.equals( path ) || subpath.startsWith( path + File.separator ) )
            {
                return true;
            }
        }

        return false;
    }

    /**
     * Runs the specified build jobs.
     *
     * @param projectsDir The base directory of all projects, must not be <code>null</code>.
     * @param buildJobs The build jobs to run must not be <code>null</code> nor contain <code>null</code> elements.
     * @throws org.apache.maven.plugin.MojoExecutionException If any build could not be launched.
     */
    private void runBuilds( File projectsDir, BuildJob[] buildJobs )
        throws MojoExecutionException
    {
        if ( !localRepositoryPath.exists() )
        {
            localRepositoryPath.mkdirs();
        }

        File interpolatedSettingsFile = null;
        if ( settingsFile != null )
        {
            if ( cloneProjectsTo != null )
            {
                interpolatedSettingsFile = new File( cloneProjectsTo, "interpolated-" + settingsFile.getName() );
            }
            else
            {
                interpolatedSettingsFile =
                    new File( settingsFile.getParentFile(), "interpolated-" + settingsFile.getName() );
            }
            buildInterpolatedFile( settingsFile, interpolatedSettingsFile );
        }

        try
        {
            for ( int i = 0; i < buildJobs.length; i++ )
            {
                BuildJob project = buildJobs[i];
                runBuild( projectsDir, project, interpolatedSettingsFile );
            }
        }
        finally
        {
            if ( interpolatedSettingsFile != null && cloneProjectsTo == null )
            {
                interpolatedSettingsFile.delete();
            }
        }
    }

    /**
     * Runs the specified project.
     *
     * @param projectsDir The base directory of all projects, must not be <code>null</code>.
     * @param buildJob The build job to run, must not be <code>null</code>.
     * @param settingsFile The (already interpolated) user settings file for the build, may be <code>null</code> to use
     *            the current user settings.
     * @throws org.apache.maven.plugin.MojoExecutionException If the project could not be launched.
     */
    private void runBuild( File projectsDir, BuildJob buildJob, File settingsFile )
        throws MojoExecutionException
    {
        File pomFile = new File( projectsDir, buildJob.getProject() );
        File basedir;
        if ( pomFile.isDirectory() )
        {
            basedir = pomFile;
            pomFile = new File( basedir, "pom.xml" );
            if ( !pomFile.exists() )
            {
                pomFile = null;
            }
            else
            {
                buildJob.setProject( buildJob.getProject() + File.separator + "pom.xml" );
            }
        }
        else
        {
            basedir = pomFile.getParentFile();
        }

        getLog().info( "Building: " + buildJob.getProject() );

        File interpolatedPomFile = null;
        if ( pomFile != null )
        {
            if ( filteredPomPrefix != null )
            {
                interpolatedPomFile = new File( basedir, filteredPomPrefix + pomFile.getName() );
                buildInterpolatedFile( pomFile, interpolatedPomFile );
            }
            else
            {
                interpolatedPomFile = pomFile;
            }
        }

        InvokerProperties invokerProperties = getInvokerProperties( basedir );

        // let's set what details we can
        buildJob.setName( invokerProperties.getJobName() );
        buildJob.setDescription( invokerProperties.getJobDescription() );

        try
        {
            if ( isSelected( invokerProperties ) )
            {
                long milliseconds = System.currentTimeMillis();
                boolean executed;
                try
                {
                    executed = runBuild( basedir, interpolatedPomFile, settingsFile, invokerProperties );
                }
                finally
                {
                    milliseconds = System.currentTimeMillis() - milliseconds;
                    buildJob.setTime( milliseconds / 1000.0 );
                }

                if ( executed )
                {

                    buildJob.setResult( BuildJob.Result.SUCCESS );

                    if ( !suppressSummaries )
                    {
                        getLog().info( "..SUCCESS " + formatTime( buildJob.getTime() ) );
                    }
                }
                else
                {
                    buildJob.setResult( BuildJob.Result.SKIPPED );

                    if ( !suppressSummaries )
                    {
                        getLog().info( "..SKIPPED " + formatTime( buildJob.getTime() ) );
                    }
                }
            }
            else
            {
                buildJob.setResult( BuildJob.Result.SKIPPED );

                if ( !suppressSummaries )
                {
                    getLog().info( "..SKIPPED " );
                }
            }
        }
        catch ( BuildErrorException e )
        {
            buildJob.setResult( BuildJob.Result.ERROR );
            buildJob.setFailureMessage( e.getMessage() );

            if ( !suppressSummaries )
            {
                getLog().info( "..ERROR " + formatTime( buildJob.getTime() ) );
                getLog().info( "  " + e.getMessage() );
            }
        }
        catch ( BuildFailureException e )
        {
            buildJob.setResult( e.getType() );
            buildJob.setFailureMessage( e.getMessage() );

            if ( !suppressSummaries )
            {
                getLog().info( "..FAILED " + formatTime( buildJob.getTime() ) );
                getLog().info( "  " + e.getMessage() );
            }
        }
        finally
        {
            if ( interpolatedPomFile != null && StringUtils.isNotEmpty( filteredPomPrefix ) )
            {
                interpolatedPomFile.delete();
            }
            writeBuildReport( buildJob );
        }
    }

    /**
     * Determines whether selector conditions of the specified invoker properties match the current environment.
     *
     * @param invokerProperties The invoker properties to check, must not be <code>null</code>.
     * @return <code>true</code> if the job corresponding to the properties should be run, <code>false</code> otherwise.
     */
    private boolean isSelected( InvokerProperties invokerProperties )
    {
        if ( !SelectorUtils.isMavenVersion( invokerProperties.getMavenVersion() ) )
        {
            return false;
        }

        if ( !SelectorUtils.isJreVersion( invokerProperties.getJreVersion() ) )
        {
            return false;
        }

        if ( !SelectorUtils.isOsFamily( invokerProperties.getOsFamily() ) )
        {
            return false;
        }

        return true;
    }

    /**
     * Writes the XML report for the specified build job unless report generation has been disabled.
     *
     * @param buildJob The build job whose report should be written, must not be <code>null</code>.
     * @throws org.apache.maven.plugin.MojoExecutionException If the report could not be written.
     */
    private void writeBuildReport( BuildJob buildJob )
        throws MojoExecutionException
    {
        if ( disableReports )
        {
            return;
        }

        if ( !reportsDirectory.exists() )
        {
            reportsDirectory.mkdirs();
        }

        String safeFileName = buildJob.getProject().replace( '/', '_' ).replace( '\\', '_' ).replace( ' ', '_' );
        if ( safeFileName.endsWith( "_pom.xml" ) )
        {
            safeFileName = safeFileName.substring( 0, safeFileName.length() - "_pom.xml".length() );
        }

        File reportFile = new File( reportsDirectory, "BUILD-" + safeFileName + ".xml" );
        try
        {
            FileOutputStream fos = new FileOutputStream( reportFile );
            try
            {
                Writer osw = new OutputStreamWriter( fos, buildJob.getModelEncoding() );
                BuildJobXpp3Writer writer = new BuildJobXpp3Writer();
                writer.write( osw, buildJob );
                osw.close();
            }
            finally
            {
                fos.close();
            }
        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "Failed to write build report " + reportFile, e );
        }
    }

    /**
     * Formats the specified build duration time.
     *
     * @param seconds The duration of the build.
     * @return The formatted time, never <code>null</code>.
     */
    private String formatTime( double seconds )
    {
        return secFormat.format( seconds );
    }

    /**
     * Runs the specified project.
     *
     * @param basedir The base directory of the project, must not be <code>null</code>.
     * @param pomFile The (already interpolated) POM file, may be <code>null</code> for a POM-less Maven invocation.
     * @param settingsFile The (already interpolated) user settings file for the build, may be <code>null</code> to use
     *            the current user settings.
     * @param invokerProperties The properties to use.
     * @return <code>true</code> if the project was launched or <code>false</code> if the selector script indicated that
     *            the project should be skipped.
     * @throws org.apache.maven.plugin.MojoExecutionException If the project could not be launched.
     * @throws org.apache.maven.plugin.invoker.BuildFailureException If either a hook script or the build itself failed.
     */
    private boolean runBuild( File basedir, File pomFile, File settingsFile, InvokerProperties invokerProperties )
        throws MojoExecutionException, BuildFailureException
    {
        if ( getLog().isDebugEnabled() && !invokerProperties.getProperties().isEmpty() )
        {
            Properties props = invokerProperties.getProperties();
            getLog().debug( "Using invoker properties:" );
            for ( Iterator it = new TreeSet( props.keySet() ).iterator(); it.hasNext(); )
            {
                String key = (String) it.next();
                String value = props.getProperty( key );
                getLog().debug( "  " + key + " = " + value );
            }
        }

        List goals = getGoals( basedir );

        List profiles = getProfiles( basedir );

        Map context = new LinkedHashMap();

        FileLogger logger = setupLogger( basedir );
        try
        {
            try
            {
                scriptRunner.run( "selector script", basedir, selectorScript, context, logger,
                                  BuildJob.Result.SKIPPED, false );
            }
            catch ( BuildErrorException e )
            {
    throw e;
            }
            catch ( BuildFailureException e )
            {
                return false;
            }
            scriptRunner.run( "pre-build script", basedir, preBuildHookScript, context, logger,
                              BuildJob.Result.FAILURE_PRE_HOOK, false );

            final InvocationRequest request = new DefaultInvocationRequest();

            request.setLocalRepositoryDirectory( localRepositoryPath );

            request.setUserSettingsFile( settingsFile );

            request.setInteractive( false );

            request.setShowErrors( showErrors );

            request.setDebug( debug );

            request.setShowVersion( showVersion );

            if ( logger != null )
            {
                request.setErrorHandler( logger );

                request.setOutputHandler( logger );
            }

            if ( mavenHome != null )
            {
                invoker.setMavenHome( mavenHome );
                request.addShellEnvironment( "M2_HOME", mavenHome.getAbsolutePath() );
            }

            if ( javaHome != null )
            {
                request.setJavaHome( javaHome );
            }

            for ( int invocationIndex = 1;; invocationIndex++ )
            {
                if ( invocationIndex > 1 && !invokerProperties.isInvocationDefined( invocationIndex ) )
                {
                    break;
                }

                request.setBaseDirectory( basedir );

                request.setPomFile( pomFile );

                request.setGoals( goals );

                request.setProfiles( profiles );

                request.setMavenOpts( mavenOpts );

                request.setOffline( false );

                Properties systemProperties =
                    getSystemProperties( basedir, invokerProperties.getSystemPropertiesFile( invocationIndex ) );
                request.setProperties( systemProperties );

                invokerProperties.configureInvocation( request, invocationIndex );

                if ( getLog().isDebugEnabled() )
                {
                    try
                    {
                        getLog().debug( "Using MAVEN_OPTS: " + request.getMavenOpts() );
                        getLog().debug( "Executing: " + new MavenCommandLineBuilder().build( request ) );
                    }
                    catch ( CommandLineConfigurationException e )
                    {
                        getLog().debug( "Failed to display command line: " + e.getMessage() );
                    }
                }

                InvocationResult result;

                try
                {
                    result = invoker.execute( request );
                }
                catch ( final MavenInvocationException e )
                {
                    getLog().debug( "Error invoking Maven: " + e.getMessage(), e );
                    throw new BuildFailureException( "Maven invocation failed. " + e.getMessage(),
                                                     BuildJob.Result.FAILURE_BUILD );
                }

                verify( result, invocationIndex, invokerProperties, logger );
            }

            scriptRunner.run( "post-build script", basedir, postBuildHookScript, context, logger,
                              BuildJob.Result.FAILURE_POST_HOOK, true );
        }
        finally
        {
            if ( logger != null )
            {
                logger.close();
            }
        }
        return true;
    }

    /**
     * Initializes the build logger for the specified project.
     *
     * @param basedir The base directory of the project, must not be <code>null</code>.
     * @return The build logger or <code>null</code> if logging has been disabled.
     * @throws org.apache.maven.plugin.MojoExecutionException If the log file could not be created.
     */
    private FileLogger setupLogger( File basedir )
        throws MojoExecutionException
    {
        FileLogger logger = null;

        if ( !noLog )
        {
            File outputLog = new File( basedir, "build.log" );
            try
            {
                if ( streamLogs )
                {
                    logger = new FileLogger( outputLog, getLog() );
                }
                else
                {
                    logger = new FileLogger( outputLog );
                }

                getLog().debug( "build log initialized in: " + outputLog );
            }
            catch ( IOException e )
            {
                throw new MojoExecutionException( "Error initializing build logfile in: " + outputLog, e );
            }
        }

        return logger;
    }

    /**
     * Gets the system properties to use for the specified project.
     *
     * @param basedir The base directory of the project, must not be <code>null</code>.
     * @param filename The filename to the properties file to load, may be <code>null</code> to use the default path
     *            given by {@link #testPropertiesFile}.
     * @return The system properties to use, may be empty but never <code>null</code>.
     * @throws org.apache.maven.plugin.MojoExecutionException If the properties file exists but could not be read.
     */
    private Properties getSystemProperties( final File basedir, final String filename )
        throws MojoExecutionException
    {
        Properties collectedTestProperties = new Properties();

        if ( testProperties != null )
        {
            collectedTestProperties.putAll( testProperties );
        }

        if ( properties != null )
        {
            collectedTestProperties.putAll( properties );
        }

        File propertiesFile = null;
        if ( filename != null )
        {
            propertiesFile = new File( basedir, filename );
        }
        else if ( testPropertiesFile != null )
        {
            propertiesFile = new File( basedir, testPropertiesFile );
        }

        if ( propertiesFile != null && propertiesFile.isFile() )
        {
            InputStream fin = null;
            try
            {
                fin = new FileInputStream( propertiesFile );

                Properties loadedProperties = new Properties();
                loadedProperties.load( fin );
                collectedTestProperties.putAll( loadedProperties );
            }
            catch ( IOException e )
            {
                throw new MojoExecutionException( "Error reading system properties from " + propertiesFile );
            }
            finally
            {
                IOUtil.close( fin );
            }
        }

        return collectedTestProperties;
    }

    /**
     * Verifies the invocation result.
     *
     * @param result The invocation result to check, must not be <code>null</code>.
     * @param invocationIndex The index of the invocation for which to check the exit code, must not be negative.
     * @param invokerProperties The invoker properties used to check the exit code, must not be <code>null</code>.
     * @param logger The build logger, may be <code>null</code> if logging is disabled.
     * @throws org.apache.maven.plugin.invoker.BuildFailureException If the invocation result indicates a build failure.
     */
    private void verify( InvocationResult result, int invocationIndex, InvokerProperties invokerProperties,
                         FileLogger logger )
        throws BuildFailureException
    {
        if ( result.getExecutionException() != null )
        {
            throw new BuildFailureException( "The Maven invocation failed. "
                + result.getExecutionException().getMessage(), BuildJob.Result.ERROR );
        }
        else if ( !invokerProperties.isExpectedResult( result.getExitCode(), invocationIndex ) )
        {
            StringBuffer buffer = new StringBuffer( 256 );
            buffer.append( "The build exited with code " ).append( result.getExitCode() ).append( ". " );
            if ( logger != null )
            {
                buffer.append( "See " );
                buffer.append( logger.getOutputFile().getAbsolutePath() );
                buffer.append( " for details." );
            }
            else
            {
                buffer.append( "See console output for details." );
            }
            throw new BuildFailureException( buffer.toString(), BuildJob.Result.FAILURE_BUILD );
        }
    }

    /**
     * Gets the goal list for the specified project.
     *
     * @param basedir The base directory of the project, must not be <code>null</code>.
     * @return The list of goals to run when building the project, may be empty but never <code>null</code>.
     * @throws org.apache.maven.plugin.MojoExecutionException If the profile file could not be read.
     */
    List getGoals( final File basedir )
        throws MojoExecutionException
    {
        try
        {
            return getTokens( basedir, goalsFile, goals );
        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "error reading goals", e );
        }
    }

    /**
     * Gets the profile list for the specified project.
     *
     * @param basedir The base directory of the project, must not be <code>null</code>.
     * @return The list of profiles to activate when building the project, may be empty but never <code>null</code>.
     * @throws org.apache.maven.plugin.MojoExecutionException If the profile file could not be read.
     */
    List getProfiles( File basedir )
        throws MojoExecutionException
    {
        try
        {
            return getTokens( basedir, profilesFile, profiles );
        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "error reading profiles", e );
        }
    }

    /**
     * Gets the build jobs that should be processed. Note that the order of the returned build jobs is significant.
     *
     * @return The build jobs to process, may be empty but never <code>null</code>.
     * @throws java.io.IOException If the projects directory could not be scanned.
     */
    BuildJob[] getBuildJobs()
        throws IOException
    {
        BuildJob[] buildJobs;

        if ( ( pom != null ) && pom.exists() )
        {
            buildJobs = new BuildJob[] { new BuildJob( pom.getAbsolutePath(), BuildJob.Type.NORMAL ) };
        }
        else if ( invokerTest != null )
        {
            String[] testRegexes = StringUtils.split( invokerTest, "," );
            List /* String */includes = new ArrayList( testRegexes.length );

            for ( int i = 0, size = testRegexes.length; i < size; i++ )
            {
                // user just use -Dinvoker.test=MWAR191,MNG111 to use a directory thats the end is not pom.xml
                includes.add( testRegexes[i] );
            }

            // it would be nice if we could figure out what types these are... but perhaps
            // not necessary for the -Dinvoker.test=xxx t
            buildJobs = scanProjectsDirectory( includes, null, BuildJob.Type.DIRECT );
        }
        else
        {
            List excludes = ( pomExcludes != null ) ? new ArrayList( pomExcludes ) : new ArrayList();
            if ( this.settingsFile != null )
            {
                String exclude = relativizePath( this.settingsFile, projectsDirectory.getCanonicalPath() );
                if ( exclude != null )
                {
                    excludes.add( exclude.replace( '\\', '/' ) );
                    getLog().debug( "Automatically excluded " + exclude + " from project scanning" );
                }
            }

            BuildJob[] setupPoms = scanProjectsDirectory( setupIncludes, excludes, BuildJob.Type.SETUP );
            getLog().debug( "Setup projects: " + Arrays.asList( setupPoms ) );

            BuildJob[] normalPoms = scanProjectsDirectory( pomIncludes, excludes, BuildJob.Type.NORMAL );

            Map uniquePoms = new LinkedHashMap();
            for ( int i = 0; i < setupPoms.length; i++ )
            {
                uniquePoms.put( setupPoms[i].getProject(), setupPoms[i] );
            }
            for ( int i = 0; i < normalPoms.length; i++ )
            {
                if ( !uniquePoms.containsKey( normalPoms[i].getProject() ) )
                {
                    uniquePoms.put( normalPoms[i].getProject(), normalPoms[i] );
                }
            }

            buildJobs = (BuildJob[]) uniquePoms.values().toArray( new BuildJob[uniquePoms.size()] );
        }

        relativizeProjectPaths( buildJobs );

        return buildJobs;
    }

    /**
     * Scans the projects directory for projects to build. Both (POM) files and mere directories will be matched by the
     * scanner patterns. If the patterns match a directory which contains a file named "pom.xml", the results will
     * include the path to this file rather than the directory path in order to avoid duplicate invocations of the same
     * project.
     *
     * @param includes The include patterns for the scanner, may be <code>null</code>.
     * @param excludes The exclude patterns for the scanner, may be <code>null</code> to exclude nothing.
     * @param type The type to assign to the resulting build jobs, must not be <code>null</code>.
     * @return The build jobs matching the patterns, never <code>null</code>.
     * @throws java.io.IOException If the project directory could not be scanned.
     */
    private BuildJob[] scanProjectsDirectory( List includes, List excludes, String type )
        throws IOException
    {
        if ( !projectsDirectory.isDirectory() )
        {
            return new BuildJob[0];
        }

        DirectoryScanner scanner = new DirectoryScanner();
        scanner.setBasedir( projectsDirectory.getCanonicalFile() );
        scanner.setFollowSymlinks( false );
        if ( includes != null )
        {
            scanner.setIncludes( (String[]) includes.toArray( new String[includes.size()] ) );
        }
        if ( excludes != null )
        {
            scanner.setExcludes( (String[]) excludes.toArray( new String[excludes.size()] ) );
        }
        scanner.addDefaultExcludes();
        scanner.scan();

        Map matches = new LinkedHashMap();

        String[] includedFiles = scanner.getIncludedFiles();
        for ( int i = 0; i < includedFiles.length; i++ )
        {
            matches.put( includedFiles[i], new BuildJob( includedFiles[i], type ) );
        }

        String[] includedDirs = scanner.getIncludedDirectories();
        for ( int i = 0; i < includedDirs.length; i++ )
        {
            String includedFile = includedDirs[i] + File.separatorChar + "pom.xml";
            if ( new File( scanner.getBasedir(), includedFile ).isFile() )
            {
                matches.put( includedFile, new BuildJob( includedFile, type ) );
            }
            else
            {
                matches.put( includedDirs[i], new BuildJob( includedDirs[i], type ) );
            }
        }

        return (BuildJob[]) matches.values().toArray( new BuildJob[matches.size()] );
    }

    /**
     * Relativizes the project paths of the specified build jobs against the directory specified by
     * {@link #projectsDirectory} (if possible). If a project path does not denote a sub path of the projects directory,
     * it is returned as is.
     *
     * @param buildJobs The build jobs whose project paths should be relativized, must not be <code>null</code> nor
     *            contain <code>null</code> elements.
     * @throws java.io.IOException If any path could not be relativized.
     */
    private void relativizeProjectPaths( BuildJob[] buildJobs )
        throws IOException
    {
        String projectsDirPath = projectsDirectory.getCanonicalPath();

        for ( int i = 0; i < buildJobs.length; i++ )
        {
            String projectPath = buildJobs[i].getProject();

            File file = new File( projectPath );

            if ( !file.isAbsolute() )
            {
                file = new File( projectsDirectory, projectPath );
            }

            String relativizedPath = relativizePath( file, projectsDirPath );

            if ( relativizedPath == null )
            {
                relativizedPath = projectPath;
            }

            buildJobs[i].setProject( relativizedPath );
        }
    }

    /**
     * Relativizes the specified path against the given base directory. Besides relativization, the returned path will
     * also be normalized, e.g. directory references like ".." will be removed.
     *
     * @param path The path to relativize, must not be <code>null</code>.
     * @param basedir The (canonical path of the) base directory to relativize against, must not be <code>null</code>.
     * @return The relative path in normal form or <code>null</code> if the input path does not denote a sub path of the
     *         base directory.
     * @throws java.io.IOException If the path could not be relativized.
     */
    private String relativizePath( File path, String basedir )
        throws IOException
    {
        String relativizedPath = path.getCanonicalPath();

        if ( relativizedPath.startsWith( basedir ) )
        {
            relativizedPath = relativizedPath.substring( basedir.length() );
            if ( relativizedPath.startsWith( File.separator ) )
            {
                relativizedPath = relativizedPath.substring( File.separator.length() );
            }

            return relativizedPath;
        }
        else
        {
            return null;
        }
    }

    /**
     * Returns the map-based value source used to interpolate POMs and other stuff.
     *
     * @return The map-based value source for interpolation, never <code>null</code>.
     */
    private Map getInterpolationValueSource()
    {
        Map props = new HashMap();
        if ( interpolationsProperties != null )
        {
            props.putAll( interpolationsProperties );
        }
        if ( filterProperties != null )
        {
            props.putAll( filterProperties );
        }
        props.put( "basedir", this.project.getBasedir().getAbsolutePath() );
        props.put( "baseurl", toUrl( this.project.getBasedir().getAbsolutePath() ) );
        if ( settings.getLocalRepository() != null )
        {
            props.put( "localRepository", settings.getLocalRepository() );
            props.put( "localRepositoryUrl", toUrl( settings.getLocalRepository() ) );
        }
        return new CompositeMap( this.project, props );
    }

    /**
     * Converts the specified filesystem path to a URL. The resulting URL has no trailing slash regardless whether the
     * path denotes a file or a directory.
     *
     * @param filename The filesystem path to convert, must not be <code>null</code>.
     * @return The <code>file:</code> URL for the specified path, never <code>null</code>.
     */
    private static String toUrl( String filename )
    {
        /*
         * NOTE: Maven fails to properly handle percent-encoded "file:" URLs (WAGON-111) so don't use File.toURI() here
         * as-is but use the decoded path component in the URL.
         */
        String url = "file://" + new File( filename ).toURI().getPath();
        if ( url.endsWith( "/" ) )
        {
            url = url.substring( 0, url.length() - 1 );
        }
        return url;
    }

    /**
     * Gets goal/profile names for the specified project, either directly from the plugin configuration or from an
     * external token file.
     *
     * @param basedir The base directory of the test project, must not be <code>null</code>.
     * @param filename The (simple) name of an optional file in the project base directory from which to read
     *            goals/profiles, may be <code>null</code>.
     * @param defaultTokens The list of tokens to return in case the specified token file does not exist, may be
     *            <code>null</code>.
     * @return The list of goal/profile names, may be empty but never <code>null</code>.
     * @throws java.io.IOException If the token file exists but could not be parsed.
     */
    private List getTokens( File basedir, String filename, List defaultTokens )
        throws IOException
    {
        List tokens = ( defaultTokens != null ) ? defaultTokens : new ArrayList();

        if ( StringUtils.isNotEmpty( filename ) )
        {
            File tokenFile = new File( basedir, filename );

            if ( tokenFile.exists() )
            {
                tokens = readTokens( tokenFile );
            }
        }

        return tokens;
    }

    /**
     * Reads the tokens from the specified file. Tokens are separated either by line terminators or commas. During
     * parsing, the file contents will be interpolated.
     *
     * @param tokenFile The file to read the tokens from, must not be <code>null</code>.
     * @return The list of tokens, may be empty but never <code>null</code>.
     * @throws java.io.IOException If the token file could not be read.
     */
    private List readTokens( final File tokenFile )
        throws IOException
    {
        List result = new ArrayList();

        BufferedReader reader = null;
        try
        {
            Map composite = getInterpolationValueSource();
            reader = new BufferedReader( new InterpolationFilterReader( newReader( tokenFile ), composite ) );

            String line = null;
            while ( ( line = reader.readLine() ) != null )
            {
                result.addAll( collectListFromCSV( line ) );
            }
        }
        finally
        {
            IOUtil.close( reader );
        }

        return result;
    }

    /**
     * Gets a list of comma separated tokens from the specified line.
     *
     * @param csv The line with comma separated tokens, may be <code>null</code>.
     * @return The list of tokens from the line, may be empty but never <code>null</code>.
     */
    private List collectListFromCSV( final String csv )
    {
        final List result = new ArrayList();

        if ( ( csv != null ) && ( csv.trim().length() > 0 ) )
        {
            final StringTokenizer st = new StringTokenizer( csv, "," );

            while ( st.hasMoreTokens() )
            {
                result.add( st.nextToken().trim() );
            }
        }

        return result;
    }

    /**
     * Interpolates the specified POM/settings file to a temporary file. The destination file may be same as the input
     * file, i.e. interpolation can be performed in-place.
     *
     * @param originalFile The XML file to interpolate, must not be <code>null</code>.
     * @param interpolatedFile The target file to write the interpolated contents of the original file to, must not be
     *            <code>null</code>.
     * @throws org.apache.maven.plugin.MojoExecutionException If the target file could not be created.
     */
    void buildInterpolatedFile( File originalFile, File interpolatedFile )
        throws MojoExecutionException
    {
        getLog().debug( "Interpolate " + originalFile.getPath() + " to " + interpolatedFile.getPath() );

        try
        {
            String xml;

            Reader reader = null;
            try
            {
                // interpolation with token @...@
                Map composite = getInterpolationValueSource();
                reader = ReaderFactory.newXmlReader( originalFile );
                reader = new InterpolationFilterReader( reader, composite, "@", "@" );
                xml = IOUtil.toString( reader );
            }
            finally
            {
                IOUtil.close( reader );
            }

            Writer writer = null;
            try
            {
                interpolatedFile.getParentFile().mkdirs();
                writer = WriterFactory.newXmlWriter( interpolatedFile );
                writer.write( xml );
                writer.flush();
            }
            finally
            {
                IOUtil.close( writer );
            }
        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "Failed to interpolate file " + originalFile.getPath(), e );
        }
    }

    /**
     * Gets the (interpolated) invoker properties for an integration test.
     *
     * @param projectDirectory The base directory of the IT project, must not be <code>null</code>.
     * @return The invoker properties, may be empty but never <code>null</code>.
     * @throws org.apache.maven.plugin.MojoExecutionException If an I/O error occurred during reading the properties.
     */
    private InvokerProperties getInvokerProperties( final File projectDirectory )
        throws MojoExecutionException
    {
        Properties props = new Properties();
        if ( invokerPropertiesFile != null )
        {
            File propertiesFile = new File( projectDirectory, invokerPropertiesFile );
            if ( propertiesFile.isFile() )
            {
                InputStream in = null;
                try
                {
                    in = new FileInputStream( propertiesFile );
                    props.load( in );
                }
                catch ( IOException e )
                {
                    throw new MojoExecutionException( "Failed to read invoker properties: " + propertiesFile, e );
                }
                finally
                {
                    IOUtil.close( in );
                }
            }

            Interpolator interpolator = new RegexBasedInterpolator();
            interpolator.addValueSource( new MapBasedValueSource( getInterpolationValueSource() ) );
            for ( Iterator it = props.keySet().iterator(); it.hasNext(); )
            {
                String key = (String) it.next();
                String value = props.getProperty( key );
                try
                {
                    value = interpolator.interpolate( value, "" );
                }
                catch ( InterpolationException e )
                {
                    throw new MojoExecutionException( "Failed to interpolate invoker properties: " + propertiesFile,
                                                      e );
                }
                props.setProperty( key, value );
            }
        }
        return new InvokerProperties( props );
    }

}
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