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- /*
- * Copyright (c) 2006-2007 Chris Smith, Shane Mc Cormack, Gregory Holmes
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
- package org.ownage.dmdirc.plugins;
-
- import java.io.DataInputStream;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.IOException;
-
-
- /**
- * A custom ClassLoader to load and unload plugins.
- */
- class PluginClassLoader extends ClassLoader {
- private String baseDir = null;
-
- /**
- * Constructs new PluginClassLoader
- *
- * @param baseDir plugin base dir
- */
- public PluginClassLoader(String baseDir) {
- this.baseDir = baseDir;
- }
-
- /**
- * Loads a plugin from disk.
- *
- * @param name plugin class name to load
- * @return plugin class
- */
- public Class loadClass(String name) throws ClassNotFoundException {
- Class loadedClass = findLoadedClass(name);
- if ( loadedClass == null ) {
- try {
- loadedClass = findSystemClass(name);
- } catch ( Exception e ) {
- // do nothing
- }
-
- if ( loadedClass == null ) {
- String fileName = baseDir + File.separator +
- name.replace('.', File.separatorChar) + ".class";
- byte[] data = null;
-
- System.out.println("Trying to load: " + fileName);
-
- try {
- data = loadClassData(fileName);
- } catch( IOException e ) {
- System.out.println(e);
- throw new ClassNotFoundException(e.getMessage());
- }
-
- loadedClass = defineClass(name,data, 0, data.length);
-
- if ( loadedClass == null ) {
- System.out.println("loadedClass == null");
- throw new ClassNotFoundException("Could not load " + name);
- } else {
- resolveClass(loadedClass);
- }
- } else {
- //Found loaded system class
- }
- } else {
- //Found loaded class
- }
-
- return loadedClass;
- }
-
- /**
- * Loads binary class data from disk.
- *
- * @param fileName file name
- * @return bytecodes
- */
- private byte[] loadClassData(String fileName) throws IOException {
- File file = new File(fileName);
- byte buffer[] = new byte[(int)file.length()];
-
- FileInputStream in = new FileInputStream(file);
- DataInputStream dataIn = new DataInputStream(in);
-
- dataIn.readFully(buffer);
- dataIn.close();
-
- return buffer;
- }
- }
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