| /* |
| * 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.taglibs.standard.tag.common.xml; |
| |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.util.List; |
| |
| import jakarta.servlet.jsp.JspException; |
| import jakarta.servlet.jsp.JspTagException; |
| import jakarta.servlet.jsp.PageContext; |
| import jakarta.servlet.jsp.tagext.BodyTagSupport; |
| import javax.xml.parsers.ParserConfigurationException; |
| import javax.xml.transform.Result; |
| import javax.xml.transform.Source; |
| import javax.xml.transform.Transformer; |
| import javax.xml.transform.TransformerConfigurationException; |
| import javax.xml.transform.TransformerException; |
| import javax.xml.transform.dom.DOMResult; |
| import javax.xml.transform.dom.DOMSource; |
| import javax.xml.transform.stream.StreamResult; |
| |
| import org.apache.taglibs.standard.resources.Resources; |
| import org.apache.taglibs.standard.tag.common.core.Util; |
| import org.apache.taglibs.standard.util.UnclosableWriter; |
| import org.apache.taglibs.standard.util.XmlUtil; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Node; |
| import org.xml.sax.SAXException; |
| |
| /** |
| * <p>Support for tag handlers for <transform>, the XML transformation |
| * tag.</p> |
| * |
| * @author Shawn Bayern |
| */ |
| public abstract class TransformSupport extends BodyTagSupport { |
| |
| //********************************************************************* |
| // Protected state |
| |
| protected Object xml; // attribute |
| protected boolean xmlSpecified; // true if xml attribute was specified |
| protected String xmlSystemId; // attribute |
| protected Object xslt; // attribute |
| protected String xsltSystemId; // attribute |
| protected Result result; // attribute |
| |
| //********************************************************************* |
| // Private state |
| |
| private String var; // 'var' attribute |
| private int scope; // processed 'scope' attr |
| private Transformer t; // actual Transformer |
| private XmlUtil.JstlEntityResolver entityResolver; |
| private XmlUtil.JstlUriResolver uriResolver; |
| |
| |
| //********************************************************************* |
| // Constructor and initialization |
| |
| public TransformSupport() { |
| init(); |
| } |
| |
| private void init() { |
| xml = xslt = null; |
| xmlSpecified = false; |
| xmlSystemId = xsltSystemId = null; |
| var = null; |
| result = null; |
| scope = PageContext.PAGE_SCOPE; |
| } |
| |
| |
| //********************************************************************* |
| // Tag logic |
| |
| @Override |
| public int doStartTag() throws JspException { |
| // set up transformer in the start tag so that nested <param> tags can set parameters directly |
| if (xslt == null) { |
| throw new JspTagException(Resources.getMessage("TRANSFORM_XSLT_IS_NULL")); |
| } |
| |
| Source source; |
| try { |
| if (xslt instanceof Source) { |
| source = (Source) xslt; |
| } else if (xslt instanceof String) { |
| String s = (String) xslt; |
| s = s.trim(); |
| if (s.length() == 0) { |
| throw new JspTagException(Resources.getMessage("TRANSFORM_XSLT_IS_EMPTY")); |
| } |
| source = XmlUtil.newSAXSource(new StringReader(s), xsltSystemId, entityResolver); |
| } else if (xslt instanceof Reader) { |
| source = XmlUtil.newSAXSource((Reader) xslt, xsltSystemId, entityResolver); |
| } else { |
| throw new JspTagException(Resources.getMessage("TRANSFORM_XSLT_UNSUPPORTED_TYPE", xslt.getClass())); |
| } |
| } catch (SAXException|ParserConfigurationException e) { |
| throw new JspException(e); |
| } |
| |
| try { |
| t = XmlUtil.newTransformer(source, uriResolver); |
| t.setURIResolver(uriResolver); |
| } catch (TransformerConfigurationException e) { |
| throw new JspTagException(e); |
| } |
| return EVAL_BODY_BUFFERED; |
| } |
| |
| @Override |
| public int doEndTag() throws JspException { |
| |
| try { |
| Source source = xmlSpecified ? getSourceFromXmlAttribute() : getSourceFromBodyContent(); |
| |
| // Conduct the transformation |
| if (var != null) { |
| // Save the result to var. |
| Document d = XmlUtil.newEmptyDocument(); |
| Result doc = new DOMResult(d); |
| t.transform(source, doc); |
| pageContext.setAttribute(var, d, scope); |
| } else { |
| // Write to out if result is not specified. |
| Result out = result; |
| if (out == null) { |
| out = new StreamResult(new UnclosableWriter(pageContext.getOut())); |
| } |
| t.transform(source, out); |
| } |
| return EVAL_PAGE; |
| } catch (TransformerException|SAXException|ParserConfigurationException e) { |
| throw new JspException(e); |
| } finally { |
| t = null; |
| } |
| } |
| |
| // Releases any resources we may have (or inherit) |
| |
| @Override |
| public void release() { |
| super.release(); |
| init(); |
| } |
| |
| @Override |
| public void setPageContext(PageContext pageContext) { |
| super.setPageContext(pageContext); |
| uriResolver = pageContext == null ? null : new XmlUtil.JstlUriResolver(pageContext); |
| entityResolver = pageContext == null ? null : new XmlUtil.JstlEntityResolver(pageContext); |
| } |
| |
| |
| //********************************************************************* |
| // Public methods for subtags |
| |
| /** |
| * Sets (adds) a transformation parameter on our transformer. |
| */ |
| public void addParameter(String name, Object value) { |
| t.setParameter(name, value); |
| } |
| |
| |
| //********************************************************************* |
| // Utility methods |
| |
| /** |
| * Return the Source for a document specified in the "doc" or "xml" attribute. |
| * |
| * @return the document Source |
| * @throws JspTagException if there is a problem with the attribute |
| */ |
| Source getSourceFromXmlAttribute() throws JspTagException, SAXException, ParserConfigurationException { |
| Object xml = this.xml; |
| if (xml == null) { |
| throw new JspTagException(Resources.getMessage("TRANSFORM_XML_IS_NULL")); |
| } |
| |
| // other JSTL XML tags may produce a list |
| if (xml instanceof List) { |
| List<?> list = (List<?>) xml; |
| if (list.size() != 1) { |
| throw new JspTagException(Resources.getMessage("TRANSFORM_XML_LIST_SIZE")); |
| } |
| xml = list.get(0); |
| } |
| |
| if (xml instanceof Source) { |
| return (Source) xml; |
| } |
| if (xml instanceof String) { |
| String s = (String) xml; |
| s = s.trim(); |
| if (s.length() == 0) { |
| throw new JspTagException(Resources.getMessage("TRANSFORM_XML_IS_EMPTY")); |
| } |
| return XmlUtil.newSAXSource(new StringReader(s), xmlSystemId, entityResolver); |
| } |
| if (xml instanceof Reader) { |
| return XmlUtil.newSAXSource((Reader) xml, xmlSystemId, entityResolver); |
| } |
| if (xml instanceof Node) { |
| return new DOMSource((Node) xml, xmlSystemId); |
| } |
| throw new JspTagException(Resources.getMessage("TRANSFORM_XML_UNSUPPORTED_TYPE", xml.getClass())); |
| } |
| |
| /** |
| * Return the Source for a document specified as body content. |
| * |
| * @return the document Source |
| * @throws JspTagException if there is a problem with the body content |
| */ |
| Source getSourceFromBodyContent() throws JspTagException, SAXException, ParserConfigurationException { |
| if (bodyContent == null) { |
| throw new JspTagException(Resources.getMessage("TRANSFORM_BODY_IS_NULL")); |
| } |
| String s = bodyContent.getString(); |
| if (s == null) { |
| throw new JspTagException(Resources.getMessage("TRANSFORM_BODY_CONTENT_IS_NULL")); |
| } |
| s = s.trim(); |
| if (s.length() == 0) { |
| throw new JspTagException(Resources.getMessage("TRANSFORM_BODY_IS_EMPTY")); |
| } |
| return XmlUtil.newSAXSource(new StringReader(s), xmlSystemId, entityResolver); |
| } |
| |
| |
| //********************************************************************* |
| // Tag attributes |
| |
| public void setVar(String var) { |
| this.var = var; |
| } |
| |
| public void setScope(String scope) { |
| this.scope = Util.getScope(scope); |
| } |
| } |