| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.commons.proxy.factory.javassist; |
| |
| import javassist.CannotCompileException; |
| import javassist.ClassPool; |
| import javassist.CtClass; |
| import javassist.CtField; |
| import javassist.LoaderClassPath; |
| import javassist.NotFoundException; |
| import org.apache.commons.proxy.ProxyUtils; |
| import org.apache.commons.proxy.exception.ObjectProviderException; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * @author James Carman |
| * @since 1.0 |
| */ |
| public class JavassistUtils |
| { |
| //---------------------------------------------------------------------------------------------------------------------- |
| // Fields |
| //---------------------------------------------------------------------------------------------------------------------- |
| public static final String DEFAULT_BASE_NAME = "JavassistUtilsGenerated"; |
| private static int classNumber = 0; |
| private static final ClassPool classPool = new ClassPool(); |
| |
| static |
| { |
| classPool.appendClassPath( new LoaderClassPath( ClassLoader.getSystemClassLoader() ) ); |
| } |
| |
| private static final Set classLoaders = new HashSet(); |
| //---------------------------------------------------------------------------------------------------------------------- |
| // Static Methods |
| //---------------------------------------------------------------------------------------------------------------------- |
| |
| public static void addField( Class fieldType, String fieldName, CtClass enclosingClass ) |
| throws CannotCompileException |
| { |
| enclosingClass.addField( new CtField( resolve( fieldType ), fieldName, enclosingClass ) ); |
| } |
| |
| public static CtClass resolve( Class clazz ) |
| { |
| synchronized( classLoaders ) |
| { |
| try |
| { |
| final ClassLoader loader = clazz.getClassLoader(); |
| if( loader != null && !classLoaders.contains( loader ) ) |
| { |
| classLoaders.add( loader ); |
| classPool.appendClassPath( new LoaderClassPath( loader ) ); |
| } |
| return classPool.get( ProxyUtils.getJavaClassName( clazz ) ); |
| } |
| catch( NotFoundException e ) |
| { |
| throw new ObjectProviderException( |
| "Unable to find class " + clazz.getName() + " in default Javassist class pool.", e ); |
| } |
| } |
| } |
| |
| public static void addInterfaces( CtClass ctClass, Class[] proxyClasses ) |
| { |
| for( int i = 0; i < proxyClasses.length; i++ ) |
| { |
| Class proxyInterface = proxyClasses[i]; |
| ctClass.addInterface( resolve( proxyInterface ) ); |
| } |
| } |
| |
| public static CtClass createClass( Class superclass ) |
| { |
| return createClass( DEFAULT_BASE_NAME, superclass ); |
| } |
| |
| public synchronized static CtClass createClass( String baseName, Class superclass ) |
| { |
| return classPool.makeClass( baseName + "_" + classNumber++, resolve( superclass ) ); |
| } |
| |
| public static CtClass[] resolve( Class[] classes ) |
| { |
| final CtClass[] ctClasses = new CtClass[classes.length]; |
| for( int i = 0; i < ctClasses.length; ++i ) |
| { |
| ctClasses[i] = resolve( classes[i] ); |
| } |
| return ctClasses; |
| } |
| } |
| |