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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 [email protected].
 *
 * 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
 * .
 */

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.WeakHashMap;

import org.aspectj.apache.bcel.classfile.ClassParser;
import org.aspectj.apache.bcel.classfile.JavaClass;

/**
 * This repository is used in situations where a Class is created outside the realm of a ClassLoader. Classes are loaded from the
 * file systems using the paths specified in the given class path. By default, this is the value returned by
 * ClassPath.getClassPath(). 
* It is designed to be used as a singleton, however it can also be used with custom classpaths. * * /** Abstract definition of a class repository. Instances may be used to load classes from different sources and may be used in * the Repository.setRepository method. * * @see org.aspectj.apache.bcel.Repository * * @version $Id: SyntheticRepository.java,v 1.8 2009/09/09 19:56:20 aclement Exp $ * @author M. Dahm * @author David Dixon-Peugh */ public class SyntheticRepository implements Repository { private static final String DEFAULT_PATH = ClassPath.getClassPath(); private static HashMap _instances = new HashMap(); // CLASSPATH // X // REPOSITORY private ClassPath _path = null; private WeakHashMap _loadedClasses = new WeakHashMap(); // CLASSNAME X JAVACLASS private SyntheticRepository(ClassPath path) { _path = path; } public static SyntheticRepository getInstance() { return getInstance(ClassPath.getSystemClassPath()); } public static SyntheticRepository getInstance(ClassPath classPath) { SyntheticRepository rep = _instances.get(classPath); if (rep == null) { rep = new SyntheticRepository(classPath); _instances.put(classPath, rep); } return rep; } /** * Store a new JavaClass instance into this Repository. */ public void storeClass(JavaClass clazz) { _loadedClasses.put(clazz.getClassName(), clazz); clazz.setRepository(this); } /** * Remove class from repository */ public void removeClass(JavaClass clazz) { _loadedClasses.remove(clazz.getClassName()); } /** * Find an already defined (cached) JavaClass object by name. */ public JavaClass findClass(String className) { return _loadedClasses.get(className); } /** * Load a JavaClass object for the given class name using the CLASSPATH environment variable. */ public JavaClass loadClass(String className) throws ClassNotFoundException { if (className == null || className.equals("")) { throw new IllegalArgumentException("Invalid class name " + className); } className = className.replace('/', '.'); // Just in case, canonical form try { return loadClass(_path.getInputStream(className), className); } catch (IOException e) { throw new ClassNotFoundException("Exception while looking for class " + className + ": " + e.toString()); } } /** * Try to find class source via getResourceAsStream(). * * @see Class * @return JavaClass object for given runtime class */ public JavaClass loadClass(Class clazz) throws ClassNotFoundException { String className = clazz.getName(); String name = className; int i = name.lastIndexOf('.'); if (i > 0) { name = name.substring(i + 1); } return loadClass(clazz.getResourceAsStream(name + ".class"), className); } private JavaClass loadClass(InputStream is, String className) throws ClassNotFoundException { JavaClass clazz = findClass(className); if (clazz != null) { return clazz; } try { if (is != null) { ClassParser parser = new ClassParser(is, className); clazz = parser.parse(); storeClass(clazz); return clazz; } } catch (IOException e) { throw new ClassNotFoundException("Exception while looking for class " + className + ": " + e.toString()); } throw new ClassNotFoundException("SyntheticRepository could not load " + className); } /** * Clear all entries from cache. */ public void clear() { _loadedClasses.clear(); } }




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