001/**
002 * Copyright 2005-2016 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.kuali.rice.krad.comparator;
017
018import org.apache.commons.lang.StringUtils;
019import org.kuali.rice.core.api.util.type.KualiDecimal;
020
021import java.io.Serializable;
022import java.util.Comparator;
023
024public class NumericValueComparator implements Serializable, Comparator {
025
026    static final long serialVersionUID = 3449202365486147519L;
027
028    private static final NumericValueComparator theInstance = new NumericValueComparator();
029    
030    public NumericValueComparator() {
031    }
032    
033    public static NumericValueComparator getInstance() {
034        return theInstance;
035    }
036    
037    public int compare(Object o1, Object o2) {
038
039        // null guard. non-null value is greater. equal if both are null
040        if (null == o1 || null == o2) {
041            return (null == o1 && null == o2) ? 0 : ((null == o1) ? -1 : 1);
042        }
043
044        String numericCompare1 = (String) o1;
045        String numericCompare2 = (String) o2;
046
047        numericCompare1 = StringUtils.replace(numericCompare1, ",", "");
048        numericCompare1 = StringUtils.replace(numericCompare1, "$", "");
049        numericCompare1 = StringUtils.replace(numericCompare1, " ", "");
050        numericCompare2 = StringUtils.replace(numericCompare2, ",", "");
051        numericCompare2 = StringUtils.replace(numericCompare2, "$", "");
052        numericCompare2 = StringUtils.replace(numericCompare2, " ", "");
053
054        // handle negatives
055        if (StringUtils.contains(numericCompare1, "(")) {
056            numericCompare1 = StringUtils.replace(numericCompare1, "(", "");
057            numericCompare1 = StringUtils.replace(numericCompare1, ")", "");
058            numericCompare1 = "-" + numericCompare1;
059        }
060
061        if (StringUtils.contains(numericCompare2, "(")) {
062            numericCompare2 = StringUtils.replace(numericCompare2, "(", "");
063            numericCompare2 = StringUtils.replace(numericCompare2, ")", "");
064            numericCompare2 = "-" + numericCompare2;
065        }
066
067        KualiDecimal k1 = null;
068        try {
069            k1 = new KualiDecimal(numericCompare1);
070        }
071        catch (Throwable t) {
072            k1 = KualiDecimal.ZERO;
073        }
074
075        KualiDecimal k2 = null;
076        try {
077            k2 = new KualiDecimal(numericCompare2);
078        }
079        catch (Throwable t) {
080            k2 = KualiDecimal.ZERO;
081        }
082
083        double d1 = k1.doubleValue();
084        double d2 = k2.doubleValue();
085
086        return (d1 == d2) ? 0 : ((d1 < d2) ? -1 : 1);
087    }
088}