001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.util;
016    
017    import java.io.Serializable;
018    
019    import java.util.ArrayList;
020    import java.util.List;
021    
022    /**
023     * @author Shuyang Zhou
024     */
025    public class ListMergeable<T>
026            implements Mergeable<ListMergeable<T>>, Serializable {
027    
028            public void add(T t) {
029                    _list.add(t);
030            }
031    
032            public boolean contains(T t) {
033                    return _list.contains(t);
034            }
035    
036            @Override
037            public ListMergeable<T> merge(ListMergeable<T> listMergeable) {
038                    if ((listMergeable == null) || (listMergeable == this)) {
039                            return this;
040                    }
041    
042                    for (T t : listMergeable._list) {
043                            if (!_list.contains(t)) {
044                                    _list.add(t);
045                            }
046                    }
047    
048                    return this;
049            }
050    
051            public String mergeToString(String delimiter) {
052                    return StringUtil.merge(_list, delimiter);
053            }
054    
055            private static final long serialVersionUID = 1L;
056    
057            private List<T> _list = new ArrayList<T>();
058    
059    }