| /* |
| * 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.JellyTagException; |
| import org.apache.commons.jelly.MissingAttributeException; |
| import org.apache.commons.jelly.XMLOutput; |
| import org.apache.commons.jelly.xpath.XPathTagSupport; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.dom4j.rule.Stylesheet; |
| import org.jaxen.JaxenException; |
| import org.jaxen.XPath; |
| |
| /** |
| * This tag performs a JSL stylesheet which was previously |
| * created via an <stylesheet> tag. |
| * |
| * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
| * @version $Revision: 1.8 $ |
| */ |
| public class StyleTag extends XPathTagSupport { |
| |
| /** The Log to which logging calls will be made. */ |
| private Log log = LogFactory.getLog(StyleTag.class); |
| |
| |
| /** Holds the stylesheet which will be applied to the source context. */ |
| private Stylesheet stylesheet; |
| |
| /** The XPath expression to evaluate. */ |
| private XPath select; |
| |
| public StyleTag() { |
| } |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
| Stylesheet stylesheet = getStylesheet(); |
| if (stylesheet == null) { |
| throw new MissingAttributeException("stylesheet"); |
| } |
| |
| if (stylesheet instanceof JellyStylesheet) { |
| JellyStylesheet jellyStyle = (JellyStylesheet) stylesheet; |
| jellyStyle.setOutput(output); |
| } |
| |
| // dom4j only seems to throw Exception |
| try { |
| Object source = getSource(); |
| if (log.isDebugEnabled()) { |
| log.debug("About to evaluate stylesheet on source: " + source); |
| } |
| |
| stylesheet.run(source); |
| } catch (Exception e) { |
| throw new JellyTagException(e); |
| } |
| } |
| |
| |
| // Properties |
| //------------------------------------------------------------------------- |
| |
| public Stylesheet getStylesheet() { |
| return stylesheet; |
| } |
| |
| /** |
| * Sets the stylesheet to use to style this tags body |
| */ |
| public void setStylesheet(Stylesheet stylesheet) { |
| this.stylesheet = stylesheet; |
| } |
| |
| /** Sets the XPath expression to evaluate. */ |
| public void setSelect(XPath select) { |
| this.select = select; |
| } |
| |
| // Implementation methods |
| //------------------------------------------------------------------------- |
| |
| /** @return the source on which the stylesheet should run |
| */ |
| protected Object getSource() throws JaxenException { |
| Object source = getXPathContext(); |
| if ( select != null ) { |
| return select.evaluate(source); |
| } |
| return source; |
| } |
| } |