| /* |
| * 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.util; |
| |
| 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; |
| |
| /** |
| * ContentHandlerFactory which constructs ContentHandlers that build DOM Documents. |
| */ |
| public class DOMBuilderContentHandlerFactory implements ContentHandlerFactory { |
| |
| private static SAXTransformerFactory tFactory |
| = (SAXTransformerFactory)SAXTransformerFactory.newInstance(); |
| |
| private String namespaceURI; |
| private DOMImplementation domImplementation; |
| |
| /** |
| * Main Constructor |
| * @param namespaceURI the main namespace URI for the DOM to be parsed |
| * @param domImplementation the DOMImplementation to use for build the DOM |
| */ |
| public DOMBuilderContentHandlerFactory(String namespaceURI, |
| DOMImplementation domImplementation) { |
| this.namespaceURI = namespaceURI; |
| this.domImplementation = domImplementation; |
| } |
| |
| /** {@inheritDoc} */ |
| public String[] getSupportedNamespaces() { |
| return new String[] {namespaceURI}; |
| } |
| |
| /** {@inheritDoc} */ |
| public ContentHandler createContentHandler() throws SAXException { |
| return new Handler(); |
| } |
| |
| private 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(); |
| } |
| } |
| |
| /** |
| * {@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); |
| } |
| doc = domImplementation.createDocument(namespaceURI, 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()); |
| } |
| } |
| |
| } |
| |
| } |