169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal/* 269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Javassist, a Java-bytecode translator toolkit. 369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved. 469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * The contents of this file are subject to the Mozilla Public License Version 669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 1.1 (the "License"); you may not use this file except in compliance with 769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the License. Alternatively, the contents of this file may be used under 869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the terms of the GNU Lesser General Public License Version 2.1 or later. 969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 1069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Software distributed under the License is distributed on an "AS IS" basis, 1169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 1269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * for the specific language governing rights and limitations under the 1369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * License. 1469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 1569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 1669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalpackage javassist.runtime; 1769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 1869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal/** 1969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * A support class for implementing <code>$cflow</code>. 2069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * This support class is required at runtime 2169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * only if <code>$cflow</code> is used. 2269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 2369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @see javassist.CtBehavior#useCflow(String) 2469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 2569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalpublic class Cflow extends ThreadLocal { 2669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal private static class Depth { 2769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal private int depth; 2869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal Depth() { depth = 0; } 2969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal int get() { return depth; } 3069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal void inc() { ++depth; } 3169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal void dec() { --depth; } 3269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 3369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 3469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal protected synchronized Object initialValue() { 3569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return new Depth(); 3669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 3769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 3869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 3969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Increments the counter. 4069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 4169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public void enter() { ((Depth)get()).inc(); } 4269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 4369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 4469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Decrements the counter. 4569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 4669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public void exit() { ((Depth)get()).dec(); } 4769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 4869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 4969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Returns the value of the counter. 5069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 5169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public int value() { return ((Depth)get()).get(); } 5269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal} 53