001// Copyright 2010 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.services; 016 017import org.apache.tapestry5.services.StackTraceElementAnalyzer; 018import org.apache.tapestry5.services.StackTraceElementClassConstants; 019 020/** 021 * Encapsulates a number of tests for identifying stack frames that are a side-effect 022 * of various Tapestry Aspect Oriented Programming and other code generation behaviors. 023 * 024 * @since 5.2.0 025 */ 026public class TapestryAOPStackFrameAnalyzer implements StackTraceElementAnalyzer 027{ 028 private static final String[] SYNTHETIC_METHOD_PREFIXES = new String[] 029 { "_$get_", "_$set_", "_$readaccess_", "_$writeaccess_" }; 030 031 public String classForFrame(StackTraceElement frame) 032 { 033 if (omit(frame)) 034 return StackTraceElementClassConstants.OMITTED; 035 036 return null; 037 } 038 039 private boolean omit(StackTraceElement frame) 040 { 041 // $FieldAccess class in root package is generated 042 043 if (frame.getClassName().startsWith("$FieldAccess_")) 044 return true; 045 046 if (frame.getMethodName().equals("invoke") && frame.getClassName().contains("$MethodAccess_")) 047 return true; 048 049 if (frame.getMethodName().equals("invokeAdvisedMethod") && frame.getClassName().contains("$invocation_")) 050 return true; 051 052 for (String prefix : SYNTHETIC_METHOD_PREFIXES) 053 { 054 if (frame.getMethodName().startsWith(prefix)) 055 return true; 056 } 057 058 return false; 059 } 060 061}