001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.hivemind.service.impl; 016 017 import javassist.CtClass; 018 import javassist.NotFoundException; 019 020 import org.apache.hivemind.ApplicationRuntimeException; 021 import org.apache.hivemind.service.ClassFabUtils; 022 023 /** 024 * Wrapper around Javassist's {@link javassist.ClassPool} and our own 025 * {@link org.apache.hivemind.service.impl.ClassFactoryClassLoader} that manages the creation of new 026 * instance of {@link javassist.CtClass} and converts finished CtClass's into instantiable Classes. 027 * 028 * @author Howard Lewis Ship 029 */ 030 public class CtClassSource 031 { 032 private HiveMindClassPool _pool; 033 034 public CtClassSource(HiveMindClassPool pool) 035 { 036 _pool = pool; 037 } 038 039 public CtClass getCtClass(Class searchClass) 040 { 041 ClassLoader loader = searchClass.getClassLoader(); 042 043 // Add the class loader for the searchClass to the class pool and 044 // delegating class loader if needed. 045 046 _pool.appendClassLoader(loader); 047 048 String name = ClassFabUtils.getJavaClassName(searchClass); 049 050 try 051 { 052 return _pool.get(name); 053 } 054 catch (NotFoundException ex) 055 { 056 throw new ApplicationRuntimeException(ServiceMessages.unableToLookupClass(name, ex), ex); 057 } 058 } 059 060 public CtClass newClass(String name, Class superClass) 061 { 062 CtClass ctSuperClass = getCtClass(superClass); 063 064 return _pool.makeClass(name, ctSuperClass); 065 } 066 067 /** 068 * Creates a new, empty interace, with the given name. 069 * 070 * @since 1.1 071 */ 072 073 public CtClass newInterface(String name) 074 { 075 return _pool.makeInterface(name); 076 } 077 078 public Class createClass(CtClass ctClass) 079 { 080 // String className = ctClass.getName(); 081 082 try 083 { 084 return _pool.toClass(ctClass); 085 } 086 catch (Throwable ex) 087 { 088 throw new ApplicationRuntimeException(ServiceMessages.unableToWriteClass(ctClass, ex), 089 ex); 090 } 091 } 092 }