svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.framework / org.gvsig.andami / src / main / java / org / gvsig / andami / plugins / PluginClassLoader.java @ 40566
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2013 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.andami.plugins; |
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import java.io.DataInputStream; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.net.MalformedURLException; |
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import java.net.URL; |
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import java.net.URLClassLoader; |
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import java.security.AllPermission; |
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import java.security.CodeSource; |
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import java.security.PermissionCollection; |
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import java.util.ArrayList; |
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import java.util.Enumeration; |
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import java.util.Hashtable; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.Map.Entry; |
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import java.util.StringTokenizer; |
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import java.util.zip.ZipEntry; |
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import java.util.zip.ZipException; |
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import java.util.zip.ZipFile; |
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import org.gvsig.andami.messages.Messages; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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/**
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* <p>Class loader which loads the classes requested by the
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* plugins. It first tries to search in the classpath, then it requests
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* the class to the parent classloader, then it searches in the owns
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* plugins' library dir, and if all these methods fail, it tries to load
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* the class from any of the depended plugins. Finally, if this also
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* fails, the other classloaders provided in the <code>addLoaders</code> method
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* are requested to load the class.</p>
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*
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* <p>The class loader can also be used to load resources from the
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* plugin's directory by using the <code>getResource()</code> method.</p>
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*
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* @author Fernando Gonz�lez Cort�s
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*/
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public class PluginClassLoader extends URLClassLoader { |
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/** DOCUMENT ME! */
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private static Logger logger = LoggerFactory.getLogger(PluginClassLoader.class.getName()); |
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/** DOCUMENT ME! */
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private Hashtable<String, ZipFile> clasesJar = new Hashtable<String, ZipFile>(); |
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/** DOCUMENT ME! */
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private File baseDir; |
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private PluginClassLoader[] pluginLoaders; |
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private static List<ClassLoader> otherLoaders=new ArrayList<ClassLoader>(); |
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private boolean isOtherLoader=false; |
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/**
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* Creates a new PluginClassLoader object.
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*
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* @param jars Array with the search paths where classes will be searched
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* @param baseDir Base directory for this plugin. This is the directory
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* which will be used as basedir in the <code>getResources</code> method.
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* @param cl The parent classloader of this classloader. It will be used to
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* search classes before trying to search in the plugin's directory
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* @param pluginLoaders The classloaders of the depended plugins.
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*
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* @throws IOException
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*/
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public PluginClassLoader(URL[] jars, String baseDir, ClassLoader cl, |
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PluginClassLoader[] pluginLoaders) throws IOException { |
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super(jars, cl);
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logger.debug("Creating PluginClassLoader for {}.", baseDir);
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this.baseDir = new File(new File(baseDir).getAbsolutePath()); |
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this.pluginLoaders = pluginLoaders;
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if( jars==null || jars.length<1 ) { |
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debugDump(); |
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return;
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} |
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ZipFile[] jarFiles = new ZipFile[jars.length]; |
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for (int i = 0; i < jars.length; i++) { |
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try {
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jarFiles[i] = new ZipFile(jars[i].getPath()); |
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Enumeration<? extends ZipEntry> entradas = jarFiles[i].entries(); |
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while (entradas.hasMoreElements()) {
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ZipEntry file = (ZipEntry) entradas.nextElement(); |
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String fileName = file.getName();
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if (!fileName.toLowerCase().endsWith(".class")) { //$NON-NLS-1$ |
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continue;
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} |
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fileName = fileName.substring(0, fileName.length() - 6) |
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.replace('/', '.'); |
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if (clasesJar.get(fileName) != null) { |
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logger.warn("Duplicated class {} in {} and {}",
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new Object[] { |
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fileName, |
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jarFiles[i].getName(), |
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clasesJar.get(fileName).getName() |
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} |
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); |
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} |
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else {
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clasesJar.put(fileName, jarFiles[i]); |
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} |
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} |
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} catch (ZipException e) { |
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throw new IOException(e.getMessage() + " Jar: " + |
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jars[i].getPath() + ": " + jarFiles[i]);
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} catch (IOException e) { |
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throw e;
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} finally {
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debugDump(); |
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} |
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} |
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} |
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private void debugDump() { |
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if( !logger.isDebugEnabled() ) {
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return;
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} |
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logger.debug(this.toString());
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logger.debug(" baseDir: " + this.baseDir); |
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logger.debug(" parent: " + this.getParent()); |
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logger.debug(" depends:");
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for( int n=0; n<this.pluginLoaders.length; n++ ) { |
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logger.debug(" {}", this.pluginLoaders[n].toString() ); |
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} |
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logger.debug(" urls:");
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URL[] urls = this.getURLs(); |
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for( int n=0 ; n<urls.length; n++ ) { |
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logger.debug(" " + urls[n].toString());
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} |
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logger.debug(" classes:");
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Iterator<Map.Entry<String, ZipFile>>it = this.clasesJar.entrySet().iterator(); |
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while( it.hasNext() ) {
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Entry<String, ZipFile> entry = it.next(); |
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logger.debug(" "+ entry.getKey() + "("+entry.getValue().getName()+")"); |
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} |
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} |
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protected Class singleLoadClass(String name) throws ClassNotFoundException { |
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// Buscamos en las clases de las librer�as del plugin
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Class<?> c = findLoadedClass(name);
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if (c != null) { |
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return c;
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} |
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logger.debug("Searching class '{}' in {}", new Object[] {name, this.toString()}); |
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try {
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ZipFile jar = (ZipFile) clasesJar.get(name); |
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//No esta en ningun jar
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if (jar == null) { |
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//Buscamos en el directorio de clases
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String classFileName = baseDir + "/classes/" + |
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name.replace('.', '/') + ".class"; |
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File f = new File(classFileName); |
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if (f.exists()){
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byte[] data = loadClassData(f); |
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c = defineClass(name, data, 0, data.length);
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logger.debug("Found class {} in classes-folder of plugin {}",
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new Object[] {name, baseDir}); |
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} else {
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//Buscamos en los otros plugins
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logger.debug("Searching in depends pluginLoaders");
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for (int i = 0; i < pluginLoaders.length; i++) { |
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c = null;
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if (pluginLoaders[i] != null) { |
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try {
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c = pluginLoaders[i].singleLoadClass(name); |
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} catch (ClassNotFoundException e) { |
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// Si no la encontramos en el primer plugin, capturamos la exceptcion
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// porque es probable que la encontremos en el resto de plugins.
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} |
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} |
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if (c != null) { |
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break;
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} |
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} |
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} |
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} else {
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String fileName = name.replace('.', '/') + ".class"; |
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ZipEntry classFile = jar.getEntry(fileName);
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byte[] data = loadClassData(classFile, |
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jar.getInputStream(classFile)); |
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c = defineClass(name, data, 0, data.length);
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logger.debug("Found class {} in jar {} of plugin {}",
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new Object[] { name, jar.getName(), baseDir} ); |
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} |
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if (c == null) { |
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throw new ClassNotFoundException(name); |
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} |
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return c;
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} catch (IOException e) { |
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throw new ClassNotFoundException(Messages.getString( |
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"PluginClassLoader.Error_reading_file") + name);
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} |
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} |
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/**
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* Carga la clase
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*
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* @param name Nombre de la clase
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* @param resolve Si se ha de resolver la clase o no
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*
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* @return Clase cargada
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*
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* @throws ClassNotFoundException Si no se pudo encontrar la clase
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*/
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protected Class loadClass(String name, boolean resolve) |
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throws ClassNotFoundException { |
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Class<?> c = null; |
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// Intentamos cargar con el system classloader
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try {
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if (!isOtherLoader)
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c = super.loadClass(name, resolve);
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logger.debug("Found class {} in system-classloader", name);
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} catch (ClassNotFoundException e1) { |
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try {
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c = singleLoadClass(name); |
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} catch (ClassNotFoundException e2) { |
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try {
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isOtherLoader=true;
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c = loadOtherClass(name); |
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}catch (ClassNotFoundException e3) { |
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// throw new ClassNotFoundException(Messages.getString(
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// "PluginClassLoader.Error_reading_file")
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// + name, e3);
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throw new ClassNotFoundException("Class " + name |
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+ " not found through the plugin " + baseDir, e3);
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}finally {
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isOtherLoader=false;
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} |
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} |
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} |
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if (c==null) |
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throw new ClassNotFoundException(Messages.getString( |
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"PluginClassLoader.Error_reading_file") + name);
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if (resolve) {
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resolveClass(c); |
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} |
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return c;
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} |
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private Class<?> loadOtherClass(String name) |
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throws ClassNotFoundException |
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{ |
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ClassLoader[] ocl=(ClassLoader[])otherLoaders.toArray(new ClassLoader[0]); |
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Class<?> c=null; |
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for (int i=0;i<ocl.length;i++) { |
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c=ocl[i].loadClass(name); |
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if (c != null) { |
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logger.debug("Found class {} by the alternative classloaders of plugin {}",
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name, baseDir); |
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return c;
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} |
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} |
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throw new ClassNotFoundException(name); |
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} |
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/**
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* obtiene el array de bytes de la clase
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*
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* @param classFile Entrada dentro del jar contiene los bytecodes de la
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* clase (el .class)
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* @param is InputStream para leer la entrada del jar
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*
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* @return Bytes de la clase
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*
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* @throws IOException Si no se puede obtener el .class del jar
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*/
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private byte[] loadClassData(ZipEntry classFile, InputStream is) |
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throws IOException { |
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// Get size of class file
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int size = (int) classFile.getSize(); |
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// Reserve space to read
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byte[] buff = new byte[size]; |
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// Get stream to read from
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DataInputStream dis = new DataInputStream(is); |
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// Read in data
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dis.readFully(buff); |
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// close stream
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dis.close(); |
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// return data
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return buff;
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} |
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/**
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* Gets the bytes of a File
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*
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* @param file File
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*
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* @return bytes of file
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*
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* @throws IOException If the operation fails
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*/
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private byte[] loadClassData(File file) throws IOException { |
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InputStream is = new FileInputStream(file); |
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// Get the size of the file
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long length = file.length();
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// You cannot create an array using a long type.
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// It needs to be an int type.
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// Before converting to an int type, check
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// to ensure that file is not larger than Integer.MAX_VALUE.
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if (length > Integer.MAX_VALUE) { |
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// File is too large
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} |
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// Create the byte array to hold the data
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byte[] bytes = new byte[(int) length]; |
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// Read in the bytes
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int offset = 0; |
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int numRead = 0; |
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while ((offset < bytes.length) &&
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((numRead = is.read(bytes, offset, bytes.length - offset)) >= 0)) {
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offset += numRead; |
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} |
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// Close the input stream and return bytes
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is.close(); |
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// Ensure all the bytes have been read in
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if (offset < bytes.length) {
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throw new IOException("Could not completely read file " + |
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file.getName()); |
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} |
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return bytes;
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} |
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/**
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* Gets the requested resource. If the path is relative, its base directory
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* will be the one provided in the PluginClassLoader's constructor.
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* If the resource is not found, the parent classloader will be invoked
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* to try to get it. If it is not found, it will return null.
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*
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* @param res An absolute or relative path to the requested resource.
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*
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* @return Resource's URL if it was found, nul otherwise.
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*/
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public URL getResource(String res) { |
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URL ret = null; |
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try {
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logger.debug("Search resource {} in {}", res, this.baseDir.toString()); |
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List<String> resource = new ArrayList<String>(); |
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StringTokenizer st = new StringTokenizer(res, "\\/"); |
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while (st.hasMoreTokens()) {
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String token = st.nextToken();
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resource.add(token); |
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} |
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ret = getResource(baseDir, resource); |
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if (ret != null) { |
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return ret;
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} |
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} catch (Exception e) { |
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logger.info("Error getting resource {} in {}'", new Object[] {res,this.baseDir.toString()}, e); |
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} |
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try {
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ret = super.getResource(res);
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} catch (Exception e) { |
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logger.info("Error getting resource {} in {}'", new Object[] {res,this.baseDir.toString()}, e); |
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} |
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if( ret == null ) { |
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logger.info("Error getting resource {} in {}'", new Object[] {res,this.baseDir.toString()}); |
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} |
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return ret;
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} |
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|
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/**
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* Gets the requested resource. If the path is relative, its base directory
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* will be the one provided in the PluginClassLoader's constructor.
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* If the resource is not found, the parent classloader will be invoked
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* to try to get it. If it is not found, it will return null.
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*
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* @param res An absolute or relative path to the requested resource.
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*
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* @return Resource's URL if it was found, nul otherwise.
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*/
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private URL getResource(File base, List<String> res) { |
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File[] files = base.listFiles(); |
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String parte = res.get(0); |
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for (int i = 0; i < files.length; i++) { |
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if (files[i].getName().compareTo(parte) == 0) { |
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if (res.size() == 1) { |
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try {
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return new URL("file:" + files[i].toString()); |
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} catch (MalformedURLException e) { |
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return null; |
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} |
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} else {
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return getResource(files[i], res.subList(1, res.size())); |
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} |
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} |
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} |
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return null; |
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} |
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|
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/**
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* Returns the name of the plugin (the name of the directory containing
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* the plugin).
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*
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* @return An String containing the plugin's name.
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*/
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public String getPluginName() { |
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String ret = baseDir.getAbsolutePath().substring(baseDir.getAbsolutePath()
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.lastIndexOf(File.separatorChar) +
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1);
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return ret;
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} |
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|
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/*
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* @see java.security.SecureClassLoader#getPermissions(java.security.CodeSource)
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*/
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protected PermissionCollection getPermissions(CodeSource codesource) { |
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PermissionCollection perms = super.getPermissions(codesource); |
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perms.add(new AllPermission()); |
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return perms;
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} |
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|
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/**
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* Gets the plugin's base Iterator<Map.Entry<Integer, Integer>>dir, the directory which will be used to
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* search resources.
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*
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* @return Returns the baseDir.
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*/
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public String getBaseDir() { |
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return baseDir.getAbsolutePath();
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} |
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|
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/**
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* Adds other classloader to use when all the normal methods fail.
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*
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* @param classLoaders An ArrayList of ClassLoaders which will
|
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* be used to load classes when all the normal methods fail.
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*/
|
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public static void addLoaders(ArrayList classLoaders) { |
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otherLoaders.addAll(classLoaders); |
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} |
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|
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@Override
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public String toString() { |
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return super.toString() + " (" + getPluginName() + ")"; |
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} |
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} |