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 015package org.apache.hivemind.service; 016 017/** 018 * Represents a created method on a class; used to add catch handlers. 019 * 020 * @see org.apache.hivemind.service.ClassFab#addMethod(int, MethodSignature, String) 021 */ 022public interface MethodFab 023{ 024 /** 025 * Adds a catch to the method. The body must end with a return or throw. The special Javassist 026 * varaiable <code>$e</code> represents the caught exception. 027 */ 028 public void addCatch(Class exceptionClass, String catchBody); 029 030 /** 031 * Extends the existing method with additional code. The new body can reference the return value 032 * generated by the existing body using the special variable <code>$_</code>, for example 033 * <code>$_ = 2 * $_</code>. 034 * 035 * @param body 036 * a block to execute after any existing code in the method 037 * @param asFinally 038 * if true, the block provided wil execute as with a finally block (even if an 039 * exception is thrown) 040 */ 041 042 public void extend(String body, boolean asFinally); 043}