Coverage report

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org.apache.commons.jelly.expression.xpath.XPathExpression |
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1 |  |
     /*
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      * Copyright 2002,2004 The Apache Software Foundation.
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      *
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      * Licensed under the Apache License, Version 2.0 (the "License");
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      * you may not use this file except in compliance with the License.
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      * You may obtain a copy of the License at
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      *
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      *      http://www.apache.org/licenses/LICENSE-2.0
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      *
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      * Unless required by applicable law or agreed to in writing, software
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      * distributed under the License is distributed on an "AS IS" BASIS,
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      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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      * See the License for the specific language governing permissions and
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      * limitations under the License.
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      */
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     package org.apache.commons.jelly.expression.xpath;
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     import java.util.Hashtable;
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     import java.util.Iterator;
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     import java.util.Map;
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     import org.apache.commons.jelly.JellyContext;
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     import org.apache.commons.jelly.expression.Expression;
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     import org.apache.commons.jelly.expression.ExpressionSupport;
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     import org.apache.commons.jelly.impl.TagScript;
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     import org.apache.commons.logging.Log;
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     import org.apache.commons.logging.LogFactory;
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     import org.jaxen.SimpleNamespaceContext;
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     import org.jaxen.VariableContext;
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     import org.jaxen.XPath;
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     import org.jaxen.JaxenException;
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     import org.jaxen.dom4j.Dom4jXPath;
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     /** An expression which returns an XPath object.
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       *
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       * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
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       * @version $Revision: 155420 $
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       */
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     public class XPathExpression extends ExpressionSupport implements VariableContext {
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         /** The Log to which logging calls will be made. */
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         private Log log = LogFactory.getLog(XPathExpression.class);
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         private String text;
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         private Expression xpathExpr;
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         private JellyContext context;
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         private Map uris;
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         public XPathExpression() {
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         }
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         public XPathExpression(String text,
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                                Expression xpathExpr,
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                                TagScript tagScript) {
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             this.text = text;
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             this.xpathExpr = xpathExpr;
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             Map namespaceContext = tagScript.getNamespaceContext();
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             this.uris = createUriMap(namespaceContext);
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         }
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         public String toString() {
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             return getExpressionText();
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         }
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         // Expression interface
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         //-------------------------------------------------------------------------
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         public String getExpressionText() {
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             return this.text;
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         }
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         public Object evaluate(JellyContext context) {
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             this.context = context;
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             try
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             {
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                 XPath xpath = new Dom4jXPath( this.xpathExpr.evaluateAsString( context ) );
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                 xpath.setVariableContext(this);
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                 if (log.isDebugEnabled()) {
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                     log.debug( "Setting the namespace context to be: " + uris );
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                 }
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                 xpath.setNamespaceContext( new SimpleNamespaceContext( this.uris ) );
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                 return xpath;
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             }
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             catch (JaxenException e)
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             {
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                 log.error( "Error constructing xpath",
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                            e );
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             }
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             return null;
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         }
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         // VariableContext interface
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         //-------------------------------------------------------------------------
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         public Object getVariableValue(
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             String namespaceURI,
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             String prefix,
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             String localName) {
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             Object value = context.getVariable(localName);
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             //log.debug( "Looking up XPath variable of name: " + localName + " value is: " + value );
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             return value;
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         }
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         // Implementation methods
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         //-------------------------------------------------------------------------
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         /**
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          * Factory method to create a synchronized Map of non-null and non-blank
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          * namespace prefixes to namespace URIs
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          */
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         protected Map createUriMap(Map namespaceContext) {
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             // now lets clone the Map but ignoring default or null prefixes
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             Map uris = new Hashtable(namespaceContext.size());
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             for (Iterator iter = namespaceContext.entrySet().iterator(); iter.hasNext(); ) {
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                 Map.Entry entry = (Map.Entry) iter.next();
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                 String prefix = (String) entry.getKey();
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                 if (prefix != null && prefix.length() != 0) {
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                     uris.put(prefix, entry.getValue());
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                 }
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             }
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             return uris;
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         }
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     }

This report is generated by jcoverage, Maven and Maven JCoverage Plugin.