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.portlet.shopping.util.comparator;
016    
017    import com.liferay.portal.kernel.util.OrderByComparator;
018    import com.liferay.portlet.shopping.model.ShoppingItem;
019    
020    /**
021     * @author Brian Wing Shun Chan
022     */
023    public class ItemPriceComparator extends OrderByComparator {
024    
025            public static final String ORDER_BY_ASC =
026                    "ShoppingItem.categoryId ASC, ShoppingItem.price ASC, " +
027                            "ShoppingItem.name ASC";
028    
029            public static final String ORDER_BY_DESC =
030                    "ShoppingItem.categoryId DESC, ShoppingItem.price DESC, " +
031                            "ShoppingItem.name DESC";
032    
033            public static final String[] ORDER_BY_FIELDS =
034                    {"categoryId", "price", "name"};
035    
036            public ItemPriceComparator() {
037                    this(false);
038            }
039    
040            public ItemPriceComparator(boolean ascending) {
041                    _ascending = ascending;
042            }
043    
044            @Override
045            public int compare(Object obj1, Object obj2) {
046                    ShoppingItem item1 = (ShoppingItem)obj1;
047                    ShoppingItem item2 = (ShoppingItem)obj2;
048    
049                    Long categoryId1 = new Long(item1.getCategoryId());
050                    Long categoryId2 = new Long(item2.getCategoryId());
051    
052                    int value = categoryId1.compareTo(categoryId2);
053    
054                    if (value == 0) {
055                            double price1 = (1 - item1.getDiscount()) * item1.getPrice();
056                            double price2 = (1 - item2.getDiscount()) * item2.getPrice();
057    
058                            if (price1 < price2) {
059                                    value = -1;
060                            }
061                            else if (price1 > price2) {
062                                    value = 1;
063                            }
064                    }
065    
066                    if (value == 0) {
067                            value = item1.getName().toLowerCase().compareTo(
068                                    item2.getName().toLowerCase());
069                    }
070    
071                    if (_ascending) {
072                            return value;
073                    }
074                    else {
075                            return -value;
076                    }
077            }
078    
079            @Override
080            public String getOrderBy() {
081                    if (_ascending) {
082                            return ORDER_BY_ASC;
083                    }
084                    else {
085                            return ORDER_BY_DESC;
086                    }
087            }
088    
089            @Override
090            public String[] getOrderByFields() {
091                    return ORDER_BY_FIELDS;
092            }
093    
094            @Override
095            public boolean isAscending() {
096                    return _ascending;
097            }
098    
099            private boolean _ascending;
100    
101    }