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The AspectJ weaver introduces advices to java classes
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
*
* 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();
}
}