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XMLXMLHandler.java 1.8KB

Initial support for XMP metadata (PDF 1.4) under fo:declarations. Both xmpmeta and RDF elements can be used as root elements for XMP metadata. Extracted DOM2SAX functionality from XMLXMLHandler into utility class since it is now reused elsewhere. New DOMBuilderContentHandlerFactory is used to create ContentHandlers that build generic DOMs. New DelegatingContentHandler is a convenience base class modelled after XMLFilterImpl but as passive SAX receiver. It is used by DOMBuilderContentHandlerFactory. Refactored FOTreeBuilder. FO tree building is now in a special ContentHandler which can be replaced temporarily when handling foreign XML like SVG or XMP. Extension Elements wanting the set their own ContentHandlers (instead of using the standard FO tree building mechanism) return a non-null value in getContentHandlerFactory(). The old mechanism is still supported (MathML, Plan and Barcode4J still use that). However, SVG support is changed to use a ContentHandlerFactory. Extension elements for xmpmeta and RDF elements making use of the new DOM build-up using ContentHandlerFactory. XMP metadata is passed to the renderer as ExtensionAttachment to the document. Only PDFRenderer uses the XMP extension attachment at this time. The PDFRenderer automatically builds XMP metadata based on the basic metadata information in the PDFInfo object if no explicit XMP metadata has been added to the XSL-FO document. XMP metadata merging is not implemented because this would involve a more sophisticated XMP infrastructure. That also means that XMP metadata is not validated. It's passed into the PDF as is. The PDF library now provides the PDFMetadata class to embed XMP metadata in PDFs version >=1.4. stream contents use a special filter list which is initially empty, so non-PDF-aware XMP readers can extract (and optionally modify) the XMP metadata. git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@378482 13f79535-47bb-0310-9956-ffa450edef68
18 years ago
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  1. /*
  2. * Licensed to the Apache Software Foundation (ASF) under one or more
  3. * contributor license agreements. See the NOTICE file distributed with
  4. * this work for additional information regarding copyright ownership.
  5. * The ASF licenses this file to You under the Apache License, Version 2.0
  6. * (the "License"); you may not use this file except in compliance with
  7. * the License. You may obtain a copy of the License at
  8. *
  9. * http://www.apache.org/licenses/LICENSE-2.0
  10. *
  11. * Unless required by applicable law or agreed to in writing, software
  12. * distributed under the License is distributed on an "AS IS" BASIS,
  13. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14. * See the License for the specific language governing permissions and
  15. * limitations under the License.
  16. */
  17. /* $Id$ */
  18. package org.apache.fop.render.xml;
  19. import org.apache.fop.render.Renderer;
  20. import org.apache.fop.render.XMLHandler;
  21. import org.apache.fop.render.RendererContext;
  22. import org.apache.fop.util.DOM2SAX;
  23. import org.xml.sax.ContentHandler;
  24. /**
  25. * XML handler for the XML renderer.
  26. */
  27. public class XMLXMLHandler implements XMLHandler {
  28. /** Key for getting the TransformerHandler from the RendererContext */
  29. public static final String HANDLER = "handler";
  30. /** {@inheritDoc} */
  31. public void handleXML(RendererContext context,
  32. org.w3c.dom.Document doc, String ns) throws Exception {
  33. ContentHandler handler = (ContentHandler) context.getProperty(HANDLER);
  34. new DOM2SAX(handler).writeDocument(doc, true);
  35. }
  36. /** {@inheritDoc} */
  37. public boolean supportsRenderer(Renderer renderer) {
  38. return (renderer instanceof XMLRenderer);
  39. }
  40. /** {@inheritDoc} */
  41. public String getNameSpace() {
  42. return null; //Handle all XML content
  43. }
  44. }