001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
013     */
014    
015    package com.liferay.util;
016    
017    import java.util.Stack;
018    
019    /**
020     * @author Brian Wing Shun Chan
021     */
022    public class FiniteStack<E> extends Stack<E> {
023    
024            public FiniteStack(int maxSize) {
025                    super();
026    
027                    _maxSize = maxSize;
028            }
029    
030            public E push(E item) {
031                    super.push(item);
032    
033                    int size = size();
034    
035                    if (size > _maxSize) {
036                            removeElementAt(size - 1);
037                    }
038    
039                    return item;
040            }
041    
042            private int _maxSize;
043    
044    }