001
014
015 package com.liferay.portal.kernel.util;
016
017 import com.liferay.portal.kernel.bean.BeanPropertiesUtil;
018
019 import java.io.Serializable;
020
021 import java.util.Comparator;
022
023
027 @SuppressWarnings("rawtypes")
028 public abstract class OrderByComparator implements Comparator, Serializable {
029
030 public abstract int compare(Object obj1, Object obj2);
031
032 public String getOrderBy() {
033 return null;
034 }
035
036 public String[] getOrderByFields() {
037 String orderBy = getOrderBy();
038
039 if (orderBy == null) {
040 return null;
041 }
042
043 String[] parts = StringUtil.split(orderBy);
044
045 String[] fields = new String[parts.length];
046
047 for (int i = 0; i < parts.length; i++) {
048 String part = parts[i];
049
050 int x = part.indexOf(CharPool.PERIOD);
051 int y = part.indexOf(CharPool.SPACE, x);
052
053 if (y == -1) {
054 y = part.length();
055 }
056
057 fields[i] = part.substring(x + 1, y);
058 }
059
060 return fields;
061 }
062
063 public Object[] getOrderByValues(Object obj) {
064 String[] fields = getOrderByFields();
065
066 Object[] values = new Object[fields.length];
067
068 for (int i = 0; i< fields.length; i++) {
069 values[i] = BeanPropertiesUtil.getObject(obj, fields[i]);
070 }
071
072 return values;
073 }
074
075 public boolean isAscending() {
076 String orderBy = getOrderBy();
077
078 if ((orderBy == null) ||
079 (orderBy.toUpperCase().endsWith(_ORDER_BY_DESC))) {
080
081 return false;
082 }
083 else {
084 return true;
085 }
086 }
087
088 @Override
089 public String toString() {
090 return getOrderBy();
091 }
092
093 private static final String _ORDER_BY_DESC = " DESC";
094
095 }