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org.apache.commons.jelly.expression.xpath.XPathExpression |
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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.expression.xpath; |
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17 | ||
18 | import java.util.Hashtable; |
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19 | import java.util.Iterator; |
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20 | import java.util.Map; |
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21 | ||
22 | import org.apache.commons.jelly.JellyContext; |
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23 | import org.apache.commons.jelly.expression.Expression; |
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24 | import org.apache.commons.jelly.expression.ExpressionSupport; |
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25 | import org.apache.commons.jelly.impl.TagScript; |
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26 | import org.apache.commons.logging.Log; |
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27 | import org.apache.commons.logging.LogFactory; |
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28 | import org.jaxen.SimpleNamespaceContext; |
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29 | import org.jaxen.VariableContext; |
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30 | import org.jaxen.XPath; |
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31 | import org.jaxen.JaxenException; |
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32 | import org.jaxen.dom4j.Dom4jXPath; |
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33 | ||
34 | /** An expression which returns an XPath object. |
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35 | * |
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36 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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37 | * @version $Revision: 1.4 $ |
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38 | */ |
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39 | 0 | public class XPathExpression extends ExpressionSupport implements VariableContext { |
40 | ||
41 | /** The Log to which logging calls will be made. */ |
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42 | 0 | private Log log = LogFactory.getLog(XPathExpression.class); |
43 | ||
44 | private String text; |
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45 | private Expression xpathExpr; |
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46 | private JellyContext context; |
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47 | private Map uris; |
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48 | ||
49 | 0 | public XPathExpression() { |
50 | 0 | } |
51 | ||
52 | public XPathExpression(String text, |
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53 | Expression xpathExpr, |
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54 | 0 | TagScript tagScript) { |
55 | 0 | this.text = text; |
56 | 0 | this.xpathExpr = xpathExpr; |
57 | ||
58 | 0 | Map namespaceContext = tagScript.getNamespaceContext(); |
59 | ||
60 | 0 | this.uris = createUriMap(namespaceContext); |
61 | 0 | } |
62 | ||
63 | public String toString() { |
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64 | 0 | return getExpressionText(); |
65 | } |
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66 | ||
67 | // Expression interface |
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68 | //------------------------------------------------------------------------- |
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69 | public String getExpressionText() { |
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70 | 0 | return this.text; |
71 | } |
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72 | ||
73 | public Object evaluate(JellyContext context) { |
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74 | 0 | this.context = context; |
75 | ||
76 | try |
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77 | { |
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78 | 0 | XPath xpath = new Dom4jXPath( this.xpathExpr.evaluateAsString( context ) ); |
79 | ||
80 | 0 | xpath.setVariableContext(this); |
81 | ||
82 | 0 | if (log.isDebugEnabled()) { |
83 | 0 | log.debug( "Setting the namespace context to be: " + uris ); |
84 | } |
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85 | ||
86 | 0 | xpath.setNamespaceContext( new SimpleNamespaceContext( this.uris ) ); |
87 | ||
88 | 0 | return xpath; |
89 | } |
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90 | catch (JaxenException e) |
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91 | { |
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92 | 0 | log.error( "Error constructing xpath", |
93 | e ); |
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94 | } |
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95 | ||
96 | 0 | return null; |
97 | } |
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98 | ||
99 | // VariableContext interface |
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100 | //------------------------------------------------------------------------- |
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101 | public Object getVariableValue( |
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102 | String namespaceURI, |
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103 | String prefix, |
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104 | String localName) { |
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105 | ||
106 | 0 | Object value = context.getVariable(localName); |
107 | ||
108 | //log.debug( "Looking up XPath variable of name: " + localName + " value is: " + value ); |
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109 | ||
110 | 0 | return value; |
111 | } |
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112 | ||
113 | // Implementation methods |
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114 | //------------------------------------------------------------------------- |
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115 | ||
116 | /** |
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117 | * Factory method to create a synchronized Map of non-null and non-blank |
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118 | * namespace prefixes to namespace URIs |
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119 | */ |
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120 | protected Map createUriMap(Map namespaceContext) { |
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121 | // now lets clone the Map but ignoring default or null prefixes |
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122 | 0 | Map uris = new Hashtable(namespaceContext.size()); |
123 | 0 | for (Iterator iter = namespaceContext.entrySet().iterator(); iter.hasNext(); ) { |
124 | 0 | Map.Entry entry = (Map.Entry) iter.next(); |
125 | 0 | String prefix = (String) entry.getKey(); |
126 | 0 | if (prefix != null && prefix.length() != 0) { |
127 | 0 | uris.put(prefix, entry.getValue()); |
128 | } |
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129 | } |
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130 | 0 | return uris; |
131 | } |
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132 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |