Coverage Report - org.mule.module.xml.transformer.JXPathExtractor
 
Classes in this File Line Coverage Branch Coverage Complexity
JXPathExtractor
79%
19/24
83%
5/6
2.2
 
 1  
 /*
 2  
  * $Id: JXPathExtractor.java 12273 2008-07-10 13:25:32Z tcarlson $
 3  
  * --------------------------------------------------------------------------------------
 4  
  * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.com
 5  
  *
 6  
  * The software in this package is published under the terms of the CPAL v1.0
 7  
  * license, a copy of which has been included with this distribution in the
 8  
  * LICENSE.txt file.
 9  
  */
 10  
 
 11  
 package org.mule.module.xml.transformer;
 12  
 
 13  
 import org.mule.api.transformer.TransformerException;
 14  
 import org.mule.module.xml.util.XMLUtils;
 15  
 import org.mule.transformer.AbstractTransformer;
 16  
 
 17  
 import java.util.ArrayList;
 18  
 import java.util.List;
 19  
 
 20  
 import org.apache.commons.jxpath.JXPathContext;
 21  
 import org.dom4j.Document;
 22  
 import org.dom4j.Node;
 23  
 import org.dom4j.XPath;
 24  
 
 25  
 /**
 26  
  * The JXPathExtractor is a simple transformer that evaluates an xpath expression
 27  
  * against the given bean and that returns the result. <p/> By default, a single
 28  
  * result will be returned. If multiple values are expected, set the
 29  
  * {@link #singleResult} property to <code>false</code>. In this case a
 30  
  * {@link List} of values will be returned. Note the property is currently ignored
 31  
  * for non-String/XML payloads.
 32  
  */
 33  6
 public class JXPathExtractor extends AbstractTransformer
 34  
 {
 35  
 
 36  
     private volatile String expression;
 37  
 
 38  6
     private volatile boolean singleResult = true;
 39  
 
 40  
     /**
 41  
      * Evaluate the expression in the context of the given object and returns the
 42  
      * result. If the given object is a string, it assumes it is an valid xml and
 43  
      * parses it before evaluating the xpath expression.
 44  
      */
 45  
     public Object doTransform(Object src, String encoding) throws TransformerException
 46  
     {
 47  
         try
 48  
         {
 49  
             Object result;
 50  6
             Document doc = XMLUtils.toDocument(src);
 51  
             
 52  
             // Payload is XML
 53  6
             if (doc != null)
 54  
             {
 55  6
                 if (singleResult)
 56  
                 {
 57  2
                     result = doc.valueOf(expression);
 58  
                 }
 59  
                 else
 60  
                 {
 61  4
                     XPath xpath = doc.createXPath(expression);
 62  
                     // TODO handle non-list cases, see
 63  
                     // http://www.dom4j.org/apidocs/org/dom4j/XPath.html#evaluate(java.lang.Object)
 64  4
                     List obj = (List)xpath.evaluate(doc);
 65  4
                     result = new ArrayList(obj.size());
 66  18
                     for (int i = 0; i < obj.size(); i++)
 67  
                     {
 68  14
                         final Node node = (Node)obj.get(i);
 69  14
                         ((List)result).add(node.getText());
 70  
                     }
 71  4
                 }
 72  
             }
 73  
             // Payload is a Java object
 74  
             else
 75  
             {
 76  0
                 JXPathContext context = JXPathContext.newContext(src);
 77  0
                 result = context.getValue(expression);
 78  
             }
 79  6
             return result;
 80  
         }
 81  0
         catch (Exception e)
 82  
         {
 83  0
             throw new TransformerException(this, e);
 84  
         }
 85  
     }
 86  
 
 87  
     /**
 88  
      * @return Returns the expression.
 89  
      */
 90  
     public String getExpression()
 91  
     {
 92  2
         return expression;
 93  
     }
 94  
 
 95  
     /**
 96  
      * @param expression The expression to set.
 97  
      */
 98  
     public void setExpression(String expression)
 99  
     {
 100  6
         this.expression = expression;
 101  6
     }
 102  
 
 103  
     /**
 104  
      * Should a single value be returned.
 105  
      * 
 106  
      * @return value
 107  
      */
 108  
     public boolean isSingleResult()
 109  
     {
 110  0
         return singleResult;
 111  
     }
 112  
 
 113  
     /**
 114  
      * If multiple results are expected from the {@link #expression} evaluation, set
 115  
      * this to false.
 116  
      * 
 117  
      * @param singleResult flag
 118  
      */
 119  
     public void setSingleResult(boolean singleResult)
 120  
     {
 121  4
         this.singleResult = singleResult;
 122  4
     }
 123  
 }