| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.XMLOutput; |
| import org.apache.commons.jelly.xpath.XPathSource; |
| import org.apache.commons.jelly.xpath.XPathTagSupport; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.dom4j.rule.Rule; |
| import org.dom4j.rule.Stylesheet; |
| import org.jaxen.JaxenException; |
| import org.jaxen.XPath; |
| |
| |
| /** |
| * This tag implements a JSL stylesheet which is similar to an |
| * XSLT stylesheet but can use Jelly tags inside it |
| * |
| * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
| * @version $Revision$ |
| */ |
| public class StylesheetTag extends XPathTagSupport implements XPathSource { |
| |
| /** The Log to which logging calls will be made. */ |
| private Log log = LogFactory.getLog(StylesheetTag.class); |
| |
| |
| /** Holds the stylesheet which will be applied to the source context. */ |
| private Stylesheet stylesheet; |
| |
| /** Holds value of property mode. */ |
| private String mode; |
| |
| /** The variable which the stylesheet will be output as */ |
| private String var; |
| |
| /** The XPath expression to evaluate. */ |
| private XPath select; |
| |
| /** The XPath source used by TemplateTag and ApplyTemplatesTag to pass XPath contexts */ |
| private Object xpathSource; |
| |
| public StylesheetTag() { |
| } |
| |
| |
| /** |
| * @return the XMLOutput from the stylesheet if available |
| */ |
| public XMLOutput getStylesheetOutput() { |
| if (stylesheet instanceof JellyStylesheet) { |
| JellyStylesheet jellyStyle = (JellyStylesheet) stylesheet; |
| return jellyStyle.getOutput(); |
| } |
| return null; |
| } |
| |
| /** |
| * Sets the XMLOutput to use by the current stylesheet |
| */ |
| public void setStylesheetOutput(XMLOutput output) { |
| if (stylesheet instanceof JellyStylesheet) { |
| JellyStylesheet jellyStyle = (JellyStylesheet) stylesheet; |
| jellyStyle.setOutput(output); |
| } |
| } |
| |
| /** |
| * Adds a new template rule to this stylesheet |
| */ |
| public void addTemplate( Rule rule ) { |
| getStylesheet().addRule( rule ); |
| } |
| |
| // XPathSource interface |
| //------------------------------------------------------------------------- |
| |
| /** |
| * @return the current XPath iteration value |
| * so that any other XPath aware child tags to use |
| */ |
| public Object getXPathSource() { |
| return xpathSource; |
| } |
| |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| public void doTag(XMLOutput output) throws JellyTagException { |
| stylesheet = createStylesheet(output); |
| |
| // run the body to add the rules |
| invokeBody(output); |
| stylesheet.setModeName(getMode()); |
| |
| if (var != null) { |
| context.setVariable(var, stylesheet); |
| } |
| else { |
| |
| //dom4j seems to only throw generic Exceptions |
| 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 |
| //------------------------------------------------------------------------- |
| |
| /** |
| * Getter for property mode. |
| * @return Value of property mode. |
| */ |
| public String getMode() { |
| return mode; |
| } |
| |
| /** |
| * Sets the mode. |
| * @param mode New value of property mode. |
| */ |
| public void setMode(String mode) { |
| this.mode = mode; |
| } |
| |
| public Stylesheet getStylesheet() { |
| return stylesheet; |
| } |
| |
| /** Sets the variable name to define for this expression |
| */ |
| public void setVar(String var) { |
| this.var = var; |
| } |
| |
| /** Sets the XPath expression to evaluate. */ |
| public void setSelect(XPath select) { |
| this.select = select; |
| } |
| |
| // Implementstion 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; |
| } |
| |
| |
| /** |
| * Factory method to create a new stylesheet |
| */ |
| protected Stylesheet createStylesheet(final XMLOutput output) { |
| JellyStylesheet answer = new JellyStylesheet(); |
| answer.setOutput(output); |
| return answer; |
| } |
| |
| /** |
| * Sets the xpathSource. |
| * @param xpathSource The xpathSource to set |
| */ |
| void setXPathSource(Object xpathSource) { |
| this.xpathSource = xpathSource; |
| } |
| |
| } |