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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.
*/
/* $Id$ */
package org.apache.fop.accessibility;
import java.util.Locale;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
import org.apache.fop.fo.FOElementMapping;
import org.apache.fop.fo.extensions.ExtensionElementMapping;
import org.apache.fop.fo.extensions.InternalElementMapping;
import org.apache.fop.render.intermediate.IFConstants;
import org.apache.fop.util.XMLConstants;
/**
* Converts structure tree events to SAX events.
*/
public final class StructureTree2SAXEventAdapter implements StructureTreeEventHandler {
private final ContentHandler contentHandler;
private StructureTree2SAXEventAdapter(ContentHandler currentContentHandler) {
this.contentHandler = currentContentHandler;
}
/**
* Factory method that creates a new instance.
* @param contentHandler The handler that receives SAX events
* @return -
*/
public static StructureTreeEventHandler newInstance(ContentHandler contentHandler) {
return new StructureTree2SAXEventAdapter(contentHandler);
}
/** {@inheritDoc} */
public void startPageSequence(Locale locale, String role) {
try {
AttributesImpl attributes = new AttributesImpl();
if (role != null) {
attributes.addAttribute("", "type", "type", XMLConstants.CDATA, role);
}
contentHandler.startPrefixMapping(
InternalElementMapping.STANDARD_PREFIX, InternalElementMapping.URI);
contentHandler.startPrefixMapping(
ExtensionElementMapping.STANDARD_PREFIX, ExtensionElementMapping.URI);
contentHandler.startElement(IFConstants.NAMESPACE,
IFConstants.EL_STRUCTURE_TREE, IFConstants.EL_STRUCTURE_TREE,
attributes);
} catch (SAXException e) {
throw new RuntimeException(e);
}
}
/** {@inheritDoc} */
public void endPageSequence() {
try {
contentHandler.endElement(IFConstants.NAMESPACE, IFConstants.EL_STRUCTURE_TREE,
IFConstants.EL_STRUCTURE_TREE);
contentHandler.endPrefixMapping(
ExtensionElementMapping.STANDARD_PREFIX);
contentHandler.endPrefixMapping(
InternalElementMapping.STANDARD_PREFIX);
} catch (SAXException e) {
throw new RuntimeException(e);
}
}
/** {@inheritDoc} */
public StructureTreeElement startNode(String name, Attributes attributes, StructureTreeElement parent) {
try {
if (name.equals("#PCDATA")) {
name = "marked-content";
contentHandler.startElement(IFConstants.NAMESPACE, name,
name, attributes);
} else {
contentHandler.startElement(FOElementMapping.URI, name,
FOElementMapping.STANDARD_PREFIX + ":" + name,
attributes);
}
return null;
} catch (SAXException e) {
throw new RuntimeException(e);
}
}
/** {@inheritDoc} */
public void endNode(String name) {
try {
contentHandler.endElement(FOElementMapping.URI, name,
FOElementMapping.STANDARD_PREFIX + ":" + name);
} catch (SAXException e) {
throw new RuntimeException(e);
}
}
/** {@inheritDoc} */
public StructureTreeElement startImageNode(String name, Attributes attributes, StructureTreeElement parent) {
return startNode(name, attributes, null);
}
/** {@inheritDoc} */
public StructureTreeElement startReferencedNode(String name, Attributes attributes, StructureTreeElement parent) {
return startNode(name, attributes, null);
}
}
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