/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- 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,
* or the Apache License Version 2.0.
*
* 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<
Cflow.
Depth> {
protected static class
Depth {
private int
depth;
Depth() {
depth = 0; }
int
value() { return
depth; }
void
inc() { ++
depth; }
void
dec() { --
depth; }
}
@
Override
protected synchronized
Depth initialValue() {
return new
Depth();
}
/**
* Increments the counter.
*/
public void
enter() {
get().
inc(); }
/**
* Decrements the counter.
*/
public void
exit() {
get().
dec(); }
/**
* Returns the value of the counter.
*/
public int
value() { return
get().
value(); }
}