Package org.jacoco.maven

Source Code of org.jacoco.maven.InstrumentMojo

/*******************************************************************************
* Copyright (c) 2009, 2014 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
*    Evgeny Mandrikov - initial API and implementation
*
*******************************************************************************/
package org.jacoco.maven;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.codehaus.plexus.util.FileUtils;
import org.codehaus.plexus.util.IOUtil;
import org.jacoco.core.instr.Instrumenter;
import org.jacoco.core.runtime.OfflineInstrumentationAccessGenerator;

/**
* Performs offline instrumentation. Note that after execution of test you must
* restore original classes with help of "restore-instrumented-classes" goal.
* <p>
* <strong>Warning:</strong> The preferred way for code coverage analysis with
* JaCoCo is on-the-fly instrumentation. Offline instrumentation has several
* drawbacks and should only be used if a specific scenario explicitly requires
* this mode. Please consult <a href="offline.html">documentation</a> about
* offline instrumentation before using this mode.
* </p>
*
* @phase process-classes
* @goal instrument
* @requiresProject true
* @threadSafe
* @since 0.6.2
*/
public class InstrumentMojo extends AbstractJacocoMojo {

  @Override
  public void executeMojo() throws MojoExecutionException,
      MojoFailureException {
    final File originalClassesDir = new File(getProject().getBuild()
        .getDirectory(), "generated-classes/jacoco");
    originalClassesDir.mkdirs();
    final File classesDir = new File(
        getProject().getBuild().getOutputDirectory());
    if (!classesDir.exists()) {
      getLog().info(
          "Skipping JaCoCo execution due to missing classes directory:" +
          classesDir);
      return;
    }

    final List<String> fileNames;
    try {
      fileNames = new FileFilter(this.getIncludes(), this.getExcludes())
          .getFileNames(classesDir);
    } catch (final IOException e1) {
      throw new MojoExecutionException(
          "Unable to get list of files to instrument.", e1);
    }

    final Instrumenter instrumenter = new Instrumenter(
        new OfflineInstrumentationAccessGenerator());
    for (final String fileName : fileNames) {
      if (fileName.endsWith(".class")) {
        final File source = new File(classesDir, fileName);
        final File backup = new File(originalClassesDir, fileName);
        InputStream input = null;
        OutputStream output = null;
        try {
          FileUtils.copyFile(source, backup);
          input = new FileInputStream(backup);
          output = new FileOutputStream(source);
          instrumenter.instrument(input, output, source.getPath());
        } catch (final IOException e2) {
          throw new MojoExecutionException(
              "Unable to instrument file.", e2);
        } finally {
          IOUtil.close(input);
          IOUtil.close(output);
        }
      }
    }
  }

}
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