org.openflexo.toolbox.JarInDirClassLoader.java Source code

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Here is the source code for org.openflexo.toolbox.JarInDirClassLoader.java

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/*
 * (c) Copyright 2013 Openflexo
 *
 * This file is part of OpenFlexo.
 *
 * OpenFlexo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * OpenFlexo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with OpenFlexo. If not, see <http://www.gnu.org/licenses/>.
 *
 */

package org.openflexo.toolbox;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Collection;
import java.util.List;

import org.apache.commons.io.FileUtils;

/**
 * 
 * This class Loader looks for classes and resources in a set of jars found in a set of directories
 * Any Jar in the directory List ist 
 * 
 * Directories can anly be added to the list and not removed.
 * 
 * @author sylvain,xtof
 *
 */

public class JarInDirClassLoader extends URLClassLoader {

    private static final java.util.logging.Logger LOGGER = org.openflexo.logging.FlexoLogger
            .getLogger(JarInDirClassLoader.class.getPackage().getName());

    private final List<File> jarDirectories;

    public JarInDirClassLoader(List<File> jarDirectories) {
        super(new URL[] {}, JarInDirClassLoader.class.getClassLoader());
        this.jarDirectories = jarDirectories;
        for (File jarDir : jarDirectories) {
            addFilesFromDirectory(jarDir);
        }
    }

    @Override
    protected void finalize() throws Throwable {
        LOGGER.info("Finalizing Jar Class Loader");
        super.finalize();
    }

    /**
     * adds a Directory in the list of directories to search for
     * 
     * @param directory
     */

    public void addJarDirectory(File directory) {
        if (directory != null && directory.isDirectory()) {
            this.jarDirectories.add(directory);
            addFilesFromDirectory(directory);
        }
    }

    /**
     * 
     * looks for files in directory and add them to the list of files to be used to resolve class and resources
     * 
     * @param jarDir
     */
    private void addFilesFromDirectory(File jarDir) {
        if (jarDir != null && jarDir.isDirectory()) {
            Collection<File> lstFile = FileUtils.listFiles(jarDir, new String[] { "jar" }, false);
            for (File f : lstFile) {
                try {
                    this.addURL(f.toURI().toURL());
                } catch (MalformedURLException e) {
                    LOGGER.severe("JarInDirClassLoader: cannot load file from Malformed URI: " + jarDir.toString());
                }
            }
        }
    }

}