001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 */
017package org.apache.xbean.finder.archive;
018
019import java.io.BufferedInputStream;
020import java.io.IOException;
021import java.io.InputStream;
022import java.net.URL;
023import java.util.Arrays;
024import java.util.Iterator;
025import java.util.LinkedHashMap;
026import java.util.LinkedHashSet;
027import java.util.Map;
028import java.util.Set;
029
030/**
031 * @version $Rev$ $Date$
032 */
033public class ClassesArchive implements Archive {
034
035    private final Set<ClassLoader> loaders = new LinkedHashSet<ClassLoader>();
036    private final Map<String, Class<?>> classes = new LinkedHashMap<String, Class<?>>();
037
038    public ClassesArchive(Class<?>... classes) {
039        this(Arrays.asList(classes));
040    }
041
042    public ClassesArchive(Iterable<Class<?>> classes) {
043        assert classes != null;
044
045        for (Class<?> clazz : classes) {
046            if (clazz == null) continue;
047            if (clazz.getClassLoader() == null) continue;
048            this.classes.put(clazz.getName(), clazz);
049            loaders.add(clazz.getClassLoader());
050        }
051    }
052
053    public Iterator<Entry> iterator() {
054        return new ArchiveIterator(this, classes.keySet().iterator());
055    }
056
057    public InputStream getBytecode(String className) throws IOException, ClassNotFoundException {
058        assert className != null;
059
060        int pos = className.indexOf("<");
061        if (pos > -1) {
062            className = className.substring(0, pos);
063        }
064        pos = className.indexOf(">");
065        if (pos > -1) {
066            className = className.substring(0, pos);
067        }
068        if (!className.endsWith(".class")) {
069            className = className.replace('.', '/') + ".class";
070        }
071        for (ClassLoader loader : loaders) {
072            URL resource = loader.getResource(className);
073            if (resource != null) return new BufferedInputStream(resource.openStream());
074        }
075
076        throw new ClassNotFoundException(className);
077    }
078
079    public Class<?> loadClass(String className) throws ClassNotFoundException {
080        Class<?> clazz = classes.get(className);
081        if (clazz != null) return clazz;
082
083        for (ClassLoader loader : loaders) {
084            try {
085                return loader.loadClass(className);
086            } catch (ClassNotFoundException e) {
087            }
088        }
089
090        throw new ClassNotFoundException(className);
091    }
092
093}