001// Copyright 2011 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 015package org.apache.tapestry5.internal.plastic; 016 017import java.lang.annotation.Annotation; 018import java.lang.reflect.Method; 019 020import org.apache.tapestry5.plastic.InstanceContext; 021import org.apache.tapestry5.plastic.MethodInvocation; 022 023public abstract class AbstractMethodInvocation implements MethodInvocation 024{ 025 private final Object instance; 026 027 private final InstanceContext instanceContext; 028 029 private final MethodInvocationBundle bundle; 030 031 private int adviceIndex; 032 033 protected AbstractMethodInvocation(Object instance, InstanceContext instanceContext, MethodInvocationBundle bundle) 034 { 035 this.instance = instance; 036 this.instanceContext = instanceContext; 037 this.bundle = bundle; 038 } 039 040 private Exception checkedException; 041 042 /** 043 * Invoked from the implementation of {@link MethodInvocation#setReturnValue(Object)}. 044 */ 045 protected void clearCheckedException() 046 { 047 checkedException = null; 048 } 049 050 public void rethrow() 051 { 052 if (checkedException != null) 053 throw new RuntimeException(checkedException); 054 } 055 056 public boolean didThrowCheckedException() 057 { 058 return checkedException != null; 059 } 060 061 public <T extends Throwable> T getCheckedException(Class<T> exceptionType) 062 { 063 assert exceptionType != null; 064 065 if (exceptionType.isInstance(checkedException)) 066 return exceptionType.cast(checkedException); 067 068 return null; 069 } 070 071 public Object getInstance() 072 { 073 return instance; 074 } 075 076 public InstanceContext getInstanceContext() 077 { 078 return instanceContext; 079 } 080 081 public MethodInvocation proceed() 082 { 083 if (adviceIndex == bundle.advice.length) 084 proceedToAdvisedMethod(); 085 else 086 bundle.advice[adviceIndex++].advise(this); 087 088 return this; 089 } 090 091 public MethodInvocation setCheckedException(Exception exception) 092 { 093 checkedException = exception; 094 095 return this; 096 } 097 098 public <T extends Annotation> boolean hasAnnotation(Class<T> annotationType) 099 { 100 return getAnnotation(annotationType) != null; 101 } 102 103 public <T extends Annotation> T getAnnotation(Class<T> annotationType) 104 { 105 return getMethod().getAnnotation(annotationType); 106 } 107 108 public Method getMethod() 109 { 110 return bundle.getMethod(getInstance()); 111 } 112 113 /** This is implemented in a runtime-generated subclass. */ 114 protected abstract void proceedToAdvisedMethod(); 115}