/**
*
* Copyright 2003-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.geronimo.core.service;
import java.util.LinkedList;
/**
*
*
*
* @version $Rev: 46019 $ $Date: 2004-09-14 03:56:06 -0600 (Tue, 14 Sep 2004) $
*/
public class StackThreadLocal {
private final ThreadLocal threadLocal = new ThreadLocal() {
protected Object initialValue() {
return new LinkedList();
}
};
public void push(Object value) {
if (value == null) {
throw new IllegalArgumentException("Value is null");
}
((LinkedList) threadLocal.get()).addFirst(value);
}
public Object pop() {
LinkedList linkedList = ((LinkedList) threadLocal.get());
if (linkedList.isEmpty()) {
return null;
}
return linkedList.removeFirst();
}
public Object peek() {
LinkedList linkedList = ((LinkedList) threadLocal.get());
if (linkedList.isEmpty()) {
return null;
}
return linkedList.getFirst();
}
}