Coverage report

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org.apache.commons.jelly.xpath.XPathComparator
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 1  
 /*
 2  
  * Copyright 2002,2004 The Apache Software Foundation.
 3  
  *
 4  
  * Licensed under the Apache License, Version 2.0 (the "License");
 5  
  * you may not use this file except in compliance with the License.
 6  
  * You may obtain a copy of the License at
 7  
  *
 8  
  *      http://www.apache.org/licenses/LICENSE-2.0
 9  
  *
 10  
  * Unless required by applicable law or agreed to in writing, software
 11  
  * distributed under the License is distributed on an "AS IS" BASIS,
 12  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13  
  * See the License for the specific language governing permissions and
 14  
  * limitations under the License.
 15  
  */
 16  
 package org.apache.commons.jelly.xpath;
 17  
 
 18  
 import java.util.Comparator;
 19  
 import java.util.List;
 20  
 
 21  
 import org.apache.commons.jelly.util.NestedRuntimeException;
 22  
 import org.dom4j.Node;
 23  
 import org.jaxen.JaxenException;
 24  
 import org.jaxen.XPath;
 25  
 
 26  
 /**
 27  
  * Compares xml nodes by extracting the value at xpath and
 28  
  * comparing it.
 29  
  *
 30  
  * @author <a href="mailto:jason@jhorman.org">Jason Horman</a>
 31  
  * @version $Id: XPathComparator.java 155420 2005-02-26 13:06:03Z dirkv $
 32  
  */
 33  
 
 34  
 public class XPathComparator implements Comparator {
 35  
 
 36  
     /** The xpath to use to extract value from nodes to compare */
 37  0
     private XPath xpath = null;
 38  
 
 39  
     /** Sort descending or ascending */
 40  0
     private boolean descending = false;
 41  
 
 42  0
     public XPathComparator() {
 43  
 
 44  0
     }
 45  
 
 46  0
     public XPathComparator(XPath xpath, boolean descending) {
 47  0
         this.xpath = xpath;
 48  0
         this.descending = descending;
 49  0
     }
 50  
 
 51  
     public void setXpath(XPath xpath) {
 52  0
         this.xpath = xpath;
 53  0
     }
 54  
 
 55  
     public XPath getXpath() {
 56  0
         return xpath;
 57  
     }
 58  
 
 59  
     public void setDescending(boolean descending) {
 60  0
         this.descending = descending;
 61  0
     }
 62  
 
 63  
     public int compare(Object o1, Object o2) {
 64  0
         return compare((Node)o1, (Node)o2);
 65  
     }
 66  
 
 67  
     public int compare(Node n1, Node n2) {
 68  
         try {
 69  
 
 70  
             // apply the xpaths. not using stringValueOf since I don't
 71  
             // want all of the child nodes appended to the strings
 72  0
             Object val1 = xpath.evaluate(n1);
 73  0
             Object val2 = xpath.evaluate(n2);
 74  
 
 75  
             // return if null
 76  0
             if (val1 == null || val2 == class="keyword">null) {
 77  0
                 return val1 == null ? (val2 == class="keyword">null ? 1 : -1) : 1;
 78  
             }
 79  
 
 80  0
             Comparable c1 = getComparableValue(val1);
 81  0
             Comparable c2 = getComparableValue(val2);
 82  
 
 83  
             // compare descending or ascending
 84  0
             if (!descending) {
 85  0
                 return c1.compareTo(c2);
 86  
             } else {
 87  0
                 return c2.compareTo(c1);
 88  
             }
 89  
 
 90  0
         } catch (JaxenException e) {
 91  
 
 92  0
             throw new XPathSortException("error sorting nodes", e);
 93  
 
 94  
         }
 95  
     }
 96  
 
 97  
     /**
 98  
      * Turns the XPath result value into a Comparable object.
 99  
      */
 100  
     protected Comparable getComparableValue(Object value) {
 101  0
         if (value instanceof List) {
 102  0
             List list = (List) value;
 103  0
             if (list.isEmpty()) {
 104  0
                 value = "";
 105  
             }
 106  0
             value = list.get(0);
 107  0
             if (value == null) {
 108  0
                 value = "";
 109  
             }
 110  
         }
 111  0
         if (value instanceof Comparable) {
 112  0
             return (Comparable) value;
 113  
         }
 114  0
         else if (value instanceof Node) {
 115  0
             Node node = (Node) value;
 116  0
             return node.getStringValue();
 117  
         }
 118  0
         return value.toString();
 119  
     }
 120  
 
 121  
     /**
 122  
      * My own runtime exception in case something goes wrong with sort.
 123  
      */
 124  
     public static class XPathSortException extends NestedRuntimeException {
 125  
         public XPathSortException(String message, Throwable cause) {
 126  
             super(message, cause);
 127  
         }
 128  
     }
 129  
 }

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