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/*
 * 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.tika.parser.odf;

import java.io.IOException;
import java.io.StringReader;
import java.util.Locale;

import org.apache.tika.sax.ContentHandlerDecorator;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

/**
 * Content handler decorator that:
    *
  • Maps old OpenOffice 1.0 Namespaces to the OpenDocument ones
  • *
  • Returns a fake DTD when parser requests OpenOffice DTD
  • *
*/ public class NSNormalizerContentHandler extends ContentHandlerDecorator { private static final String OLD_NS = "http://openoffice.org/2000/"; private static final String NEW_NS = "urn:oasis:names:tc:opendocument:xmlns:"; private static final String DTD_PUBLIC_ID = "-//OpenOffice.org//DTD OfficeDocument 1.0//EN"; public NSNormalizerContentHandler(ContentHandler handler) { super(handler); } private String mapOldNS(String ns) { if (ns != null && ns.startsWith(OLD_NS)) { return NEW_NS + ns.substring(OLD_NS.length()) + ":1.0"; } else { return ns; } } @Override public void startElement( String namespaceURI, String localName, String qName, Attributes atts) throws SAXException { AttributesImpl natts = new AttributesImpl(); for (int i = 0; i < atts.getLength(); i++) { natts.addAttribute( mapOldNS(atts.getURI(i)), atts.getLocalName(i), atts.getQName(i), atts.getType(i), atts.getValue(i)); } super.startElement(mapOldNS(namespaceURI), localName, qName, atts); } @Override public void endElement(String namespaceURI, String localName, String qName) throws SAXException { super.endElement(mapOldNS(namespaceURI), localName, qName); } @Override public void startPrefixMapping(String prefix, String uri) throws SAXException { super.startPrefixMapping(prefix, mapOldNS(uri)); } /** * do not load any DTDs (may be requested by parser). Fake the DTD by * returning a empty string as InputSource */ @Override public InputSource resolveEntity(String publicId, String systemId) throws IOException, SAXException { if ((systemId != null && systemId.toLowerCase(Locale.ROOT).endsWith(".dtd")) || DTD_PUBLIC_ID.equals(publicId)) { return new InputSource(new StringReader("")); } else { return super.resolveEntity(publicId, systemId); } } }




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