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/*
* This file is part of the Javassist toolkit.
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* either http://www.mozilla.org/MPL/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is Javassist.
*
* The Initial Developer of the Original Code is Shigeru Chiba. Portions
* created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
* All Rights Reserved.
*
* Contributor(s):
*
* The development of this software is supported in part by the PRESTO
* program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
*/
package javassist.runtime;
/**
* A support class for implementing <code>$cflow</code>.
* This support class is required at runtime
* only if <code>$cflow</code> is used.
*
* @see javassist.CtBehavior#useCflow(String)
*/
public class Cflow extends ThreadLocal {
private static class Depth {
private int depth;
Depth() { depth = 0; }
int get() { return depth; }
void inc() { ++depth; }
void dec() { --depth; }
}
protected synchronized Object initialValue() {
return new Depth();
}
/**
* Increments the counter.
*/
public void enter() { ((Depth)get()).inc(); }
/**
* Decrements the counter.
*/
public void exit() { ((Depth)get()).dec(); }
/**
* Returns the value of the counter.
*/
public int value() { return ((Depth)get()).get(); }
}
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