Package org.apache.catalina.startup

Source Code of org.apache.catalina.startup.ClassLoaderFactory

/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2008 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License").  You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code.  If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license."  If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above.  However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.
*/




package org.apache.catalina.startup;


import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.apache.catalina.loader.StandardClassLoader;


/**
* <p>Utility class for building class loaders for Catalina.  The factory
* method requires the following parameters in order to build a new class
* loader (with suitable defaults in all cases):</p>
* <ul>
* <li>A set of directories containing unpacked classes (and resources)
*     that should be included in the class loader's
*     repositories.</li>
* <li>A set of directories containing classes and resources in JAR files.
*     Each readable JAR file discovered in these directories will be
*     added to the class loader's repositories.</li>
* <li><code>ClassLoader</code> instance that should become the parent of
*     the new class loader.</li>
* </ul>
*
* @author Craig R. McClanahan
* @version $Revision: 1.4.6.1 $ $Date: 2008/04/17 18:37:24 $
*/

public final class ClassLoaderFactory {


    // ------------------------------------------------------- Static Variables


    private static com.sun.org.apache.commons.logging.Log log=
        com.sun.org.apache.commons.logging.LogFactory.getLog( ClassLoaderFactory.class );

    /**
     * Debugging detail level for processing the startup.
     */
    private static int debug = 0;


    // ------------------------------------------------------ Static Properties


    /**
     * Return the debugging detail level.
     */
    public static int getDebug() {

        return (debug);

    }


    /**
     * Set the debugging detail level.
     *
     * @param newDebug The new debugging detail level
     */
    public static void setDebug(int newDebug) {

        debug = newDebug;

    }


    // --------------------------------------------------------- Public Methods


    /**
     * Create and return a new class loader, based on the configuration
     * defaults and the specified directory paths:
     *
     * @param unpacked Array of pathnames to unpacked directories that should
     *  be added to the repositories of the class loader, or <code>null</code>
     * for no unpacked directories to be considered
     * @param packed Array of pathnames to directories containing JAR files
     *  that should be added to the repositories of the class loader,
     * or <code>null</code> for no directories of JAR files to be considered
     * @param parent Parent class loader for the new class loader, or
     *  <code>null</code> for the system class loader.
     *
     * @exception Exception if an error occurs constructing the class loader
     */
    public static ClassLoader createClassLoader(File unpacked[],
                                                File packed[],
                                                ClassLoader parent)
        throws Exception {
        return createClassLoader(unpacked, packed, null, parent);
    }


    /**
     * Create and return a new class loader, based on the configuration
     * defaults and the specified directory paths:
     *
     * @param unpacked Array of pathnames to unpacked directories that should
     *  be added to the repositories of the class loader, or <code>null</code>
     * for no unpacked directories to be considered
     * @param packed Array of pathnames to directories containing JAR files
     *  that should be added to the repositories of the class loader,
     * or <code>null</code> for no directories of JAR files to be considered
     * @param urls Array of URLs to remote repositories, designing either JAR
     *  resources or uncompressed directories that should be added to
     *  the repositories of the class loader, or <code>null</code> for no
     *  directories of JAR files to be considered
     * @param parent Parent class loader for the new class loader, or
     *  <code>null</code> for the system class loader.
     *
     * @exception Exception if an error occurs constructing the class loader
     */
    public static ClassLoader createClassLoader(File unpacked[],
                                                File packed[],
                                                URL urls[],
                                                ClassLoader parent)
        throws Exception {

        if (log.isDebugEnabled())
            log.debug("Creating new class loader");

        // Construct the "class path" for this class loader
        ArrayList list = new ArrayList();

        // Add unpacked directories
        if (unpacked != null) {
            for (int i = 0; i < unpacked.length; i++)  {
                File file = unpacked[i];
                if (!file.exists() || !file.canRead())
                    continue;
                if (log.isDebugEnabled())
                    log.debug("  Including directory or JAR "
                        + file.getAbsolutePath());
                URL url = new URL("file", null,
                                  file.getCanonicalPath() + File.separator);
                list.add(url.toString());
            }
        }

        // Add packed directory JAR files
        if (packed != null) {
            for (int i = 0; i < packed.length; i++) {
                File directory = packed[i];
                if (!directory.isDirectory() || !directory.exists() ||
                    !directory.canRead())
                    continue;
                String filenames[] = directory.list();
                for (int j = 0; j < filenames.length; j++) {
                    String filename = filenames[j].toLowerCase();
                    if (!filename.endsWith(".jar"))
                        continue;
                    File file = new File(directory, filenames[j]);
                    if (log.isDebugEnabled())
                        log.debug("  Including jar file " + file.getAbsolutePath());
                    URL url = new URL("file", null,
                                      file.getCanonicalPath());
                    list.add(url.toString());
                }
            }
        }

        // Add remote URLs
        if (urls != null) {
            for (int i = 0; i < urls.length; i++) {
                list.add(urls[i].toString());
            }
        }

        // Construct the class loader itself
        String array[] = (String[]) list.toArray(new String[list.size()]);
        StandardClassLoader classLoader = null;
        if (parent == null)
            classLoader = new StandardClassLoader(array);
        else
            classLoader = new StandardClassLoader(array, parent);
        classLoader.setDelegate(true);
        return (classLoader);

    }


    // -------------------------------------------------------- Private Methods



}
TOP

Related Classes of org.apache.catalina.startup.ClassLoaderFactory

TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.