| /* |
| * Copyright 2002,2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.jelly.tags.jsl; |
| |
| import org.apache.commons.jelly.JellyException; |
| import org.apache.commons.jelly.expression.Expression; |
| import org.apache.commons.jelly.expression.ExpressionFactory; |
| import org.apache.commons.jelly.impl.TagScript; |
| import org.apache.commons.jelly.tags.xml.ExprTag; |
| import org.apache.commons.jelly.tags.xml.XMLTagLibrary; |
| import org.apache.commons.jelly.expression.xpath.XPathExpression; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.dom4j.DocumentHelper; |
| import org.dom4j.rule.Pattern; |
| |
| /** Describes the Taglib. This class could be generated by XDoclet |
| * |
| * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
| * @version $Revision: 1.6 $ |
| */ |
| public class JSLTagLibrary extends XMLTagLibrary { |
| |
| /** The Log to which logging calls will be made. */ |
| private Log log = LogFactory.getLog(JSLTagLibrary.class); |
| |
| public JSLTagLibrary() { |
| registerTag("stylesheet", StylesheetTag.class); |
| registerTag("style", StyleTag.class); |
| registerTag("template", TemplateTag.class); |
| registerTag("applyTemplates", ApplyTemplatesTag.class); |
| registerTag("valueOf", ExprTag.class); |
| } |
| |
| public Expression createExpression( |
| ExpressionFactory factory, |
| TagScript tagScript, |
| String attributeName, |
| String attributeValue) throws JellyException { |
| |
| // #### may need to include some namespace URI information in the XPath instance? |
| |
| if (attributeName.equals("select")) { |
| if ( log.isDebugEnabled() ) { |
| log.debug( "Parsing XPath expression: " + attributeValue ); |
| } |
| |
| Expression xpathExpr = createXPathTextExpression( attributeValue ); |
| |
| return new XPathExpression(attributeValue, xpathExpr, tagScript); |
| } |
| |
| if (attributeName.equals("match")) { |
| if ( log.isDebugEnabled() ) { |
| log.debug( "Parsing XPath pattern: " + attributeValue ); |
| } |
| |
| try { |
| Pattern pattern = DocumentHelper.createPattern( attributeValue ); |
| return new XPathPatternExpression(attributeValue, pattern); |
| } |
| catch (Exception e) { |
| throw new JellyException( "Could not parse XPath expression: \"" + attributeValue + "\" reason: " + e, e ); |
| } |
| } |
| |
| // will use the default expression instead |
| return super.createExpression(factory, tagScript, attributeName, attributeValue); |
| } |
| |
| |
| } |