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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2003 Shigeru Chiba. All Rights Reserved.
*
* 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. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later.
*
* 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.
*/
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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