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