001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.commons.lang;
020
021import java.text.Collator;
022import java.util.Comparator;
023import java.util.Locale;
024
025import lucee.runtime.type.comparator.NumberComparator;
026import lucee.runtime.type.comparator.TextComparator;
027
028public class ComparatorUtil {
029
030        public static final int SORT_TYPE_TEXT=1;
031        public static final int SORT_TYPE_TEXT_NO_CASE=2;
032        public static final int SORT_TYPE_NUMBER=3;
033        
034        public static Comparator toComparator(int sortType, boolean orderAsc, Locale l,Comparator defaultValue) {
035                // text
036                if(sortType==SORT_TYPE_TEXT) {
037                        if(l!=null)return toCollator(l,Collator.IDENTICAL);
038                        return new TextComparator(orderAsc,false);
039                }
040                // text no case
041                else if(sortType==SORT_TYPE_TEXT_NO_CASE) {
042                        if(l!=null)return toCollator(l,Collator.TERTIARY);
043                        return new TextComparator(orderAsc,true);
044                }
045                // numeric
046                else if(sortType==SORT_TYPE_NUMBER) {
047                        return new NumberComparator(orderAsc);
048                }
049                else {
050                        return defaultValue;
051                }       
052        }
053        
054
055        private static Comparator toCollator(Locale l, int strength) {
056                Collator c=Collator.getInstance(l);
057                c.setStrength(strength);
058                c.setDecomposition(Collator.CANONICAL_DECOMPOSITION);
059                return c;
060        }
061
062}