001    /*
002     * Copyright (C) 2012 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    package org.crsh.lang.java;
020    
021    import java.security.SecureClassLoader;
022    import java.util.HashMap;
023    import java.util.Map;
024    
025    /** @author Julien Viet */
026    class LoadingClassLoader extends SecureClassLoader {
027    
028      /** . */
029      private final Map<String, byte[]> definitions;
030    
031      /** . */
032      private final HashMap<String, Class<?>> classes;
033    
034      LoadingClassLoader(ClassLoader parent, Iterable<JavaClassFileObject> files) {
035        super(parent);
036    
037        //
038        HashMap<String, byte[]> definitions = new HashMap<String,byte[]>();
039        for (JavaClassFileObject definition : files) {
040          definitions.put(definition.getClassName(), definition.getBytes());
041        }
042    
043        //
044        this.definitions = definitions;
045        this.classes = new HashMap<String, Class<?>>();
046      }
047    
048      LoadingClassLoader(Map<String, byte[]> definitions) {
049        this.definitions = definitions;
050        this.classes = new HashMap<String, Class<?>>();
051      }
052    
053      @Override
054      protected Class<?> findClass(String name) throws ClassNotFoundException {
055        Class<?> clazz = classes.get(name);
056        if (clazz == null) {
057          byte[] definition = definitions.get(name);
058          if (definition == null) {
059            return super.findClass(name);
060          } else {
061            classes.put(name, clazz = super.defineClass(name, definition, 0, definition.length));
062          }
063        }
064        return clazz;
065      }
066    }