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- package org.aspectj.apache.bcel.util;
-
- /* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2001 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" and
- * "Apache BCEL" must not be used to endorse or promote products
- * derived from this software without prior written permission. For
- * written permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * "Apache BCEL", nor may "Apache" appear in their name, without
- * prior written permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- import java.io.IOException;
- import java.io.InputStream;
- import java.lang.ref.ReferenceQueue;
- import java.lang.ref.SoftReference;
- import java.net.URL;
- import java.net.URLClassLoader;
- import java.util.AbstractMap;
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.Map;
- import java.util.Set;
-
- import org.aspectj.apache.bcel.classfile.ClassParser;
- import org.aspectj.apache.bcel.classfile.JavaClass;
-
- /**
- * The repository maintains information about which classes have been loaded.
- *
- * It loads its data from the ClassLoader implementation passed into its constructor.
- *
- * @see org.aspectj.apache.bcel.Repository
- *
- * @version $Id: NonCachingClassLoaderRepository.java,v 1.6 2009/09/09 19:56:20 aclement Exp $
- * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
- * @author David Dixon-Peugh
- *
- */
- public class NonCachingClassLoaderRepository implements Repository {
- private static java.lang.ClassLoader bootClassLoader = null;
-
- private final ClassLoaderReference loaderRef;
- private final Map<String, JavaClass> loadedClasses = new SoftHashMap();
-
- public static class SoftHashMap extends AbstractMap {
- private Map<Object, SpecialValue> map;
- private ReferenceQueue rq = new ReferenceQueue();
-
- public SoftHashMap(Map<Object, SpecialValue> map) {
- this.map = map;
- }
-
- public SoftHashMap() {
- this(new HashMap<Object,SpecialValue>());
- }
-
- public SoftHashMap(Map<Object,SpecialValue> map, boolean b) {
- this(map);
- }
-
- class SpecialValue extends SoftReference {
- private final Object key;
-
- SpecialValue(Object k, Object v) {
- super(v, rq);
- this.key = k;
- }
- }
-
- private void processQueue() {
- SpecialValue sv = null;
- while ((sv = (SpecialValue) rq.poll()) != null) {
- map.remove(sv.key);
- }
- }
-
- @Override
- public Object get(Object key) {
- SpecialValue value = map.get(key);
- if (value == null)
- return null;
- if (value.get() == null) {
- // it got GC'd
- map.remove(value.key);
- return null;
- } else {
- return value.get();
- }
- }
-
- @Override
- public Object put(Object k, Object v) {
- processQueue();
- return map.put(k, new SpecialValue(k, v));
- }
-
- @Override
- public Set entrySet() {
- return map.entrySet();
- }
-
- @Override
- public void clear() {
- processQueue();
- Set<Object> keys = map.keySet();
- for (Iterator<Object> iterator = keys.iterator(); iterator.hasNext();) {
- Object name = iterator.next();
- map.remove(name);
- }
- }
-
- @Override
- public int size() {
- processQueue();
- return map.size();
- }
-
- @Override
- public Object remove(Object k) {
- processQueue();
- SpecialValue value = map.remove(k);
- if (value == null)
- return null;
- if (value.get() != null) {
- return value.get();
- }
- return null;
- }
- }
-
- public NonCachingClassLoaderRepository(java.lang.ClassLoader loader) {
- this.loaderRef = new DefaultClassLoaderReference((loader != null) ? loader : getBootClassLoader());
- }
-
- public NonCachingClassLoaderRepository(ClassLoaderReference loaderRef) {
- this.loaderRef = loaderRef;
- }
-
- private static synchronized java.lang.ClassLoader getBootClassLoader() {
- if (bootClassLoader == null) {
- bootClassLoader = new URLClassLoader(new URL[0]);
- }
- return bootClassLoader;
- }
-
- /**
- * Store a new JavaClass into this Repository.
- */
- public void storeClass(JavaClass clazz) {
- synchronized (loadedClasses) {
- loadedClasses.put(clazz.getClassName(), clazz);
- }
- clazz.setRepository(this);
- }
-
- /**
- * Remove class from repository
- */
- public void removeClass(JavaClass clazz) {
- synchronized (loadedClasses) {
- loadedClasses.remove(clazz.getClassName());
- }
- }
-
- /**
- * Find an already defined JavaClass.
- */
- public JavaClass findClass(String className) {
- synchronized (loadedClasses) {
- if (loadedClasses.containsKey(className)) {
- return loadedClasses.get(className);
- } else {
- return null;
- }
- }
- }
-
- /**
- * Clear all entries from cache.
- */
- public void clear() {
- synchronized (loadedClasses) {
- loadedClasses.clear();
- }
- }
-
- /**
- * Lookup a JavaClass object from the Class Name provided.
- */
- public JavaClass loadClass(String className) throws ClassNotFoundException {
-
- JavaClass javaClass = findClass(className);
- if (javaClass != null) {
- return javaClass;
- }
-
- javaClass = loadJavaClass(className);
- storeClass(javaClass);
-
- return javaClass;
- }
-
- public JavaClass loadClass(Class clazz) throws ClassNotFoundException {
- return loadClass(clazz.getName());
- }
-
- private JavaClass loadJavaClass(String className) throws ClassNotFoundException {
- String classFile = className.replace('.', '/');
- try {
- InputStream is = loaderRef.getClassLoader().getResourceAsStream(classFile + ".class");
-
- if (is == null) {
- throw new ClassNotFoundException(className + " not found.");
- }
-
- ClassParser parser = new ClassParser(is, className);
- return parser.parse();
- } catch (IOException e) {
- throw new ClassNotFoundException(e.toString());
- }
- }
-
- }
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