    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
    015    package org.apache.tapestry5.internal.services;
    016
    017    import org.apache.tapestry5.services.StackTraceElementAnalyzer;
    018    import 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     */
    026    public 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    }