svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.framework / org.gvsig.andami / src / main / java / org / gvsig / andami / plugins / PluginClassLoader.java @ 42929
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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 modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 3 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us at info AT
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* 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.Arrays; |
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import java.util.Collections; |
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import java.util.Enumeration; |
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import java.util.HashMap; |
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import java.util.HashSet; |
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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.Set; |
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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>
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* Class loader which loads the classes requested by the plugins. It first tries
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* to search in the classpath, then it requests the class to the parent
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* classloader, then it searches in the owns plugins' library dir, and if all
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* these methods fail, it tries to load the class from any of the depended
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* plugins. Finally, if this also fails, the other classloaders provided in the
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* <code>addLoaders</code> method are requested to load the class.</p>
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*
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* <p>
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* The class loader can also be used to load resources from the plugin's
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* 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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/**
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* DOCUMENT ME!
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*/
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private static Logger logger = LoggerFactory.getLogger(PluginClassLoader.class.getName()); |
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private Map<String, ZipFile> clasesJar = new HashMap<>(); |
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private File baseDir; |
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private List<PluginClassLoader> pluginLoaders; |
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private static List<ClassLoader> otherLoaders = new ArrayList<>(); |
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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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this(jars, baseDir, cl, Arrays.asList(pluginLoaders)); |
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} |
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public PluginClassLoader(URL[] jars, String baseDir, ClassLoader cl, |
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List<PluginClassLoader> pluginLoaders) throws IOException { |
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super(jars, cl);
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this.baseDir = new File(new File(baseDir).getAbsolutePath()); |
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try {
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logger.debug("Creating PluginClassLoader for {}.", this.getPluginName()); |
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this.pluginLoaders = new ArrayList(); |
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this.pluginLoaders.addAll(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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logger.debug("Classloader {}, loading jar {}", this.getPluginName(), jars[i].getPath()); |
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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("Classloader {}, duplicated class {} in {} and {}",
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new Object[]{ |
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this.getPluginName(),
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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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} 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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} |
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} |
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} finally {
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debugDump(); |
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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 (PluginClassLoader pluginLoader : this.pluginLoaders) { |
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logger.debug(" {}", pluginLoader.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 (URL url : urls) { |
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logger.debug(" " + url.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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Class<?> c;
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Set<String> pluginsVisiteds = new HashSet<>(); |
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c = this.singleLoadClass(pluginsVisiteds, name);
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return c;
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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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@Override
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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 URLClassLoader
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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("Classloader {}, found class {}.", this.getPluginName(), name); |
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} |
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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("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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} |
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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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ClassLoader[] ocls = (ClassLoader[]) otherLoaders.toArray(new ClassLoader[0]); |
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Class<?> c;
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for (ClassLoader ocl : ocls) { |
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c = ocl.loadClass(name); |
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if (c != null) { |
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logger.debug("Classloader {}, found class {} in classloader {}",
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new Object[]{this, getPluginName(), name, ocl.toString()} |
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); |
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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. If the
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* resource is not found, search in dependents plugins, otherwise the parent
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* classloader will be invoked to try to get it. If it is not found, it will
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* 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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@Override
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public URL getResource(String res) { |
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URL ret ;
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Set<String> pluginsVisiteds = new HashSet<>(); |
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ret = this.getResource(pluginsVisiteds, res);
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return ret;
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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. If the
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* resource is not found, the parent classloader will be invoked to try to
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* 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 (File file : files) { |
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if (file.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:" + file.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(file, 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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@Override
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public Enumeration<URL> getResources(String name) throws IOException { |
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HashSet visitedPlugins = new HashSet(); |
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return getResources(name, visitedPlugins);
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} |
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protected Enumeration<URL> getResources(String name, HashSet<PluginClassLoader> visitedPlugins) throws IOException { |
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List<URL> resources = new ArrayList<>(); |
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Enumeration<URL> aux = super.getResources(name); |
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while(aux.hasMoreElements()){
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URL url = aux.nextElement();
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resources.add(url); |
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} |
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visitedPlugins.add(this);
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for(PluginClassLoader loader: this.pluginLoaders){ |
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if (!visitedPlugins.contains(loader)) {
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aux = loader.getResources(name, visitedPlugins); |
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while(aux.hasMoreElements()){
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URL url = aux.nextElement();
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resources.add(url); |
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} |
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} |
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} |
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return Collections.enumeration(resources); |
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} |
413 |
|
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/**
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* Returns the name of the plugin (the name of the directory containing the
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* 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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return baseDir.getName();
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} |
423 |
|
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/*
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* @see java.security.SecureClassLoader#getPermissions(java.security.CodeSource)
|
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*/
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@Override
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protected PermissionCollection getPermissions(CodeSource codesource) { |
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PermissionCollection perms = super.getPermissions(codesource); |
430 |
perms.add(new AllPermission()); |
431 |
|
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return perms;
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} |
434 |
|
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/**
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* Gets the plugin's base Iterator<Map.Entry<Integer, Integer>>dir, the
|
437 |
* directory which will be used to search resources.
|
438 |
*
|
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* @return Returns the baseDir.
|
440 |
*/
|
441 |
public String getBaseDir() { |
442 |
return baseDir.getAbsolutePath();
|
443 |
} |
444 |
|
445 |
/**
|
446 |
* Adds other classloader to use when all the normal methods fail.
|
447 |
*
|
448 |
* @param classLoaders An ArrayList of ClassLoaders which will be used to
|
449 |
* load classes when all the normal methods fail.
|
450 |
*/
|
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public static void addLoaders(ArrayList classLoaders) { |
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otherLoaders.addAll(classLoaders); |
453 |
} |
454 |
|
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@Override
|
456 |
public String toString() { |
457 |
return super.toString() + " (" + getPluginName() + ")"; |
458 |
} |
459 |
|
460 |
public void addPluginClassLoader(PluginClassLoader pluginClassLoader) { |
461 |
if (!this.pluginLoaders.contains(pluginClassLoader)) { |
462 |
this.pluginLoaders.add(pluginClassLoader);
|
463 |
} |
464 |
} |
465 |
|
466 |
private Class singleLoadClass(Set<String> pluginsVisiteds, String name) throws ClassNotFoundException { |
467 |
|
468 |
if (pluginsVisiteds.contains(this.getPluginName())) { |
469 |
return null; |
470 |
} |
471 |
pluginsVisiteds.add(this.getPluginName());
|
472 |
|
473 |
// Buscamos en las clases de las librer�as del plugin
|
474 |
Class<?> c = findLoadedClass(name);
|
475 |
|
476 |
if (c != null) { |
477 |
return c;
|
478 |
} |
479 |
|
480 |
logger.debug("Classloader {}, searching class '{}'",
|
481 |
new Object[]{this.getPluginName(), name} |
482 |
); |
483 |
try {
|
484 |
ZipFile jar = (ZipFile) clasesJar.get(name); |
485 |
|
486 |
//No esta en ningun jar
|
487 |
if (jar == null) { |
488 |
//Buscamos en el directorio de clases
|
489 |
String classFileName = baseDir + "/classes/" |
490 |
+ name.replace('.', '/') + ".class"; |
491 |
File f = new File(classFileName); |
492 |
if (f.exists()) {
|
493 |
byte[] data = loadClassData(f); |
494 |
c = defineClass(name, data, 0, data.length);
|
495 |
logger.debug("Classloader {}/classes-folder, found class {}",
|
496 |
new Object[]{this.getPluginName(), name} |
497 |
); |
498 |
|
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} else {
|
500 |
for (PluginClassLoader pluginLoader1 : pluginLoaders) {
|
501 |
c = null;
|
502 |
PluginClassLoader pluginLoader = pluginLoader1; |
503 |
if (pluginLoader != null) { |
504 |
try {
|
505 |
c = pluginLoader.singleLoadClass(pluginsVisiteds, name); |
506 |
} catch (ClassNotFoundException e) { |
507 |
// Si no la encontramos en el primer plugin, capturamos la exceptcion
|
508 |
// porque es probable que la encontremos en el resto de plugins.
|
509 |
} |
510 |
if (c != null) { |
511 |
logger.debug("Classloader {}, found class {} in plugin {}",
|
512 |
new Object[]{ |
513 |
this.getPluginName(),
|
514 |
name, |
515 |
pluginLoader.getPluginName() |
516 |
} |
517 |
); |
518 |
return c;
|
519 |
} |
520 |
} |
521 |
} |
522 |
|
523 |
|
524 |
} |
525 |
} else {
|
526 |
logger.debug("Classloader {}, found class {} in jar {}",
|
527 |
new Object[]{ |
528 |
this.getPluginName(),
|
529 |
name, |
530 |
jar.getName() |
531 |
} |
532 |
); |
533 |
String fileName = name.replace('.', '/') + ".class"; |
534 |
ZipEntry classFile = jar.getEntry(fileName);
|
535 |
byte[] data = loadClassData(classFile, |
536 |
jar.getInputStream(classFile)); |
537 |
|
538 |
c = defineClass(name, data, 0, data.length);
|
539 |
if (c == null) { |
540 |
logger.debug("Classloader {}, can't load class {} from jar {}",
|
541 |
new Object[]{ |
542 |
this.getPluginName(),
|
543 |
name, |
544 |
jar.getName() |
545 |
} |
546 |
); |
547 |
} |
548 |
|
549 |
} |
550 |
|
551 |
if (c == null) { |
552 |
logger.debug("Classloader {}, class not found {}",
|
553 |
new Object[]{ |
554 |
this.getPluginName(),
|
555 |
name |
556 |
} |
557 |
); |
558 |
debugDump(); |
559 |
throw new ClassNotFoundException(name); |
560 |
} |
561 |
|
562 |
return c;
|
563 |
} catch (IOException e) { |
564 |
logger.debug("Classloader {}, error loading class {}",
|
565 |
new Object[]{ |
566 |
this.getPluginName(),
|
567 |
name |
568 |
}, |
569 |
e |
570 |
); |
571 |
throw new ClassNotFoundException(Messages.getString( |
572 |
"PluginClassLoader.Error_reading_file") + name);
|
573 |
} |
574 |
} |
575 |
|
576 |
/**
|
577 |
* Este metodo busca en este class loader y en el de los plugins de los que
|
578 |
* depende. Se cerciora de que no se queda bucleado cuando hay una relacion
|
579 |
* recursiva entre los plugins.
|
580 |
*
|
581 |
* @param pluginsVisiteds, set con los plugins que va visitando para evitar
|
582 |
* que se quede bucleado cuando hay referencia ciclicas entre plugins.
|
583 |
* @param res
|
584 |
*
|
585 |
* @return
|
586 |
*/
|
587 |
private URL getResource(Set<String> pluginsVisiteds, String res) { |
588 |
URL ret = null; |
589 |
|
590 |
if (pluginsVisiteds.contains(this.getPluginName())) { |
591 |
return null; |
592 |
} |
593 |
pluginsVisiteds.add(this.getPluginName());
|
594 |
|
595 |
//
|
596 |
// Primero buscamos en el directorio del plugin.
|
597 |
try {
|
598 |
logger.debug("Classloader {}, searching resource '{}'", this.getPluginName(), res); |
599 |
List<String> resource = new ArrayList<>(); |
600 |
StringTokenizer st = new StringTokenizer(res, "\\/"); |
601 |
while (st.hasMoreTokens()) {
|
602 |
String token = st.nextToken();
|
603 |
resource.add(token); |
604 |
} |
605 |
ret = getResource(baseDir, resource); |
606 |
if (ret != null) { |
607 |
return ret;
|
608 |
} |
609 |
} catch (Exception e) { |
610 |
logger.warn("Classloader {}, Error getting resource '{}'.",
|
611 |
new Object[]{ |
612 |
this.getPluginName(), res
|
613 |
}, |
614 |
e |
615 |
); |
616 |
} |
617 |
|
618 |
logger.debug("Classloader {}, searching in depends pluginLoaders", this.getPluginName()); |
619 |
for (PluginClassLoader pluginClassLoader : this.pluginLoaders) { |
620 |
if (pluginClassLoader != null) { |
621 |
try {
|
622 |
pluginsVisiteds.add(pluginClassLoader.getPluginName()); |
623 |
ret = pluginClassLoader.getResource(pluginsVisiteds, res); |
624 |
if (ret != null) { |
625 |
logger.debug("Classloader {}, Found resource '{}' in plugin '{}'.",
|
626 |
new Object[]{ |
627 |
this.getPluginName(), res, pluginClassLoader.getPluginName(),});
|
628 |
return ret;
|
629 |
} |
630 |
} catch (Exception e) { |
631 |
// Ignore, try in next classloader
|
632 |
} |
633 |
} |
634 |
} |
635 |
|
636 |
if (ret == null) { |
637 |
//
|
638 |
// Por ultimo en el class loader padre, se supone que es el del sistema.
|
639 |
try {
|
640 |
ret = super.getResource(res);
|
641 |
} catch (Exception e) { |
642 |
logger.warn("Classloader {}, error getting resource '{}' in parent classloader'",
|
643 |
new Object[]{this.getPluginName(), res}, |
644 |
e |
645 |
); |
646 |
} |
647 |
if (ret == null) { |
648 |
logger.debug("Classloader {}, Resource '{}' not found.",
|
649 |
new Object[]{this.getPluginName(), res} |
650 |
); |
651 |
} |
652 |
} |
653 |
return ret;
|
654 |
} |
655 |
|
656 |
} |