| /* |
| * 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. |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.fop.fo.extensions.svg; |
| |
| import javax.xml.transform.TransformerConfigurationException; |
| import javax.xml.transform.dom.DOMResult; |
| import javax.xml.transform.sax.SAXTransformerFactory; |
| import javax.xml.transform.sax.TransformerHandler; |
| |
| import org.w3c.dom.DOMImplementation; |
| import org.w3c.dom.Document; |
| |
| import org.xml.sax.Attributes; |
| import org.xml.sax.ContentHandler; |
| import org.xml.sax.SAXException; |
| |
| import org.apache.batik.dom.svg.SVGDOMImplementation; |
| |
| import org.apache.fop.util.ContentHandlerFactory; |
| import org.apache.fop.util.DelegatingContentHandler; |
| |
| /** |
| * ContentHandlerFactory which constructs ContentHandlers that build SVG DOM |
| * Documents. |
| */ |
| public class SVGDOMContentHandlerFactory implements ContentHandlerFactory { |
| |
| private static SAXTransformerFactory tFactory |
| = (SAXTransformerFactory)SAXTransformerFactory.newInstance(); |
| |
| /** |
| * Default Constructor. |
| */ |
| public SVGDOMContentHandlerFactory() { |
| // nop |
| } |
| |
| /** {@inheritDoc} */ |
| public String[] getSupportedNamespaces() { |
| return new String[] {SVGDOMImplementation.SVG_NAMESPACE_URI}; |
| } |
| |
| /** {@inheritDoc} */ |
| public ContentHandler createContentHandler() throws SAXException { |
| return new Handler(); |
| } |
| |
| private static class Handler extends DelegatingContentHandler implements |
| ContentHandlerFactory.ObjectSource { |
| |
| private Document doc; |
| private ObjectBuiltListener obListener; |
| |
| public Handler() throws SAXException { |
| super(); |
| } |
| |
| public Document getDocument() { |
| return this.doc; |
| } |
| |
| /** {@inheritDoc} */ |
| public Object getObject() { |
| return getDocument(); |
| } |
| |
| /** {@inheritDoc} */ |
| public void setObjectBuiltListener(ObjectBuiltListener listener) { |
| this.obListener = listener; |
| } |
| |
| /** {@inheritDoc} */ |
| public void startDocument() throws SAXException { |
| // Suppress startDocument() call if doc has not been set, yet. It |
| // will be done later. |
| if (doc != null) { |
| super.startDocument(); |
| } |
| } |
| |
| private DOMImplementation getDOMImplementation(String ver) { |
| //TODO It would be great if Batik provided this method as static helper method. |
| if (ver == null || ver.length() == 0 |
| || ver.equals("1.0") || ver.equals("1.1")) { |
| return SVGDOMImplementation.getDOMImplementation(); |
| } else if (ver.equals("1.2")) { |
| try { |
| Class clazz = Class.forName( |
| "org.apache.batik.dom.svg12.SVG12DOMImplementation"); |
| return (DOMImplementation)clazz.getMethod( |
| "getDOMImplementation", null).invoke(null, null); |
| } catch (Exception e) { |
| return SVGDOMImplementation.getDOMImplementation(); |
| } |
| } |
| throw new RuntimeException("Unsupport SVG version '" + ver + "'"); |
| } |
| |
| /** {@inheritDoc} */ |
| public void startElement(String uri, String localName, String qName, Attributes atts) |
| throws SAXException { |
| if (doc == null) { |
| TransformerHandler handler; |
| try { |
| handler = tFactory.newTransformerHandler(); |
| } catch (TransformerConfigurationException e) { |
| throw new SAXException("Error creating a new TransformerHandler", e); |
| } |
| String version = atts.getValue("version"); |
| DOMImplementation domImplementation = getDOMImplementation(version); |
| doc = domImplementation.createDocument(uri, qName, null); |
| // It's easier to work with an empty document, so remove the |
| // root element |
| doc.removeChild(doc.getDocumentElement()); |
| handler.setResult(new DOMResult(doc)); |
| setDelegateContentHandler(handler); |
| setDelegateLexicalHandler(handler); |
| setDelegateDTDHandler(handler); |
| handler.startDocument(); |
| } |
| super.startElement(uri, localName, qName, atts); |
| } |
| |
| /** {@inheritDoc} */ |
| public void endDocument() throws SAXException { |
| super.endDocument(); |
| if (obListener != null) { |
| obListener.notifyObjectBuilt(getObject()); |
| } |
| } |
| |
| } |
| |
| } |