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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. |
|
| 6 | * You may obtain a copy of the License at |
|
| 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 |
|
| 14 | * limitations under the License. |
|
| 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: 155420 $ |
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| 38 | */ |
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| 39 | public class XPathExpression extends ExpressionSupport implements VariableContext { |
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| 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 | 0 | catch (JaxenException e) |
| 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 | 0 | } |
| 130 | 0 | return uris; |
| 131 | } |
|
| 132 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |