BoundStack.java :  » App » atoom-android » net » atoom » android » l2 » util » Android Open Source

/**
 *    Copyright 2009 Bram de Kruijff <bdekruijff [at] gmail [dot] com>
 *
 *  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 net.atoom.android.l2.util;

import java.util.LinkedList;

public final class BoundStack<T> {

  private final LinkedList<T> myList;
  private final int myStackSize;

  public BoundStack(final int stacksize) {
    myStackSize = stacksize;
    myList = new LinkedList<T>();
  }

  public synchronized void push(T value) {
    myList.addFirst(value);
    if (myList.size() > myStackSize) {
      myList.removeLast();
    }
  }

  public synchronized T pop() {
    T value = null;
    if (myList.size() > 0) {
      value = myList.getFirst();
      myList.removeFirst();
    }
    return value;
  }
  
  public synchronized int size(){
    return myList.size();
  }
}