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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.render.pdf;
import java.util.LinkedList;
import java.util.Locale;
import org.xml.sax.Attributes;
import org.apache.fop.accessibility.StructureTreeElement;
import org.apache.fop.accessibility.StructureTreeEventHandler;
import org.apache.fop.events.EventBroadcaster;
import org.apache.fop.fo.extensions.ExtensionElementMapping;
import org.apache.fop.pdf.PDFFactory;
import org.apache.fop.pdf.PDFName;
import org.apache.fop.pdf.PDFObject;
import org.apache.fop.pdf.PDFParentTree;
import org.apache.fop.pdf.PDFStructElem;
import org.apache.fop.pdf.PDFStructTreeRoot;
class PDFStructureTreeBuilder implements StructureTreeEventHandler {
private PDFFactory pdfFactory;
private PDFLogicalStructureHandler logicalStructureHandler;
private EventBroadcaster eventBroadcaster;
private LinkedList<PDFStructElem> ancestors = new LinkedList<PDFStructElem>();
private PDFStructElem rootStructureElement;
void setPdfFactory(PDFFactory pdfFactory) {
this.pdfFactory = pdfFactory;
}
void setLogicalStructureHandler(PDFLogicalStructureHandler logicalStructureHandler) {
this.logicalStructureHandler = logicalStructureHandler;
createRootStructureElement();
}
private void createRootStructureElement() {
assert rootStructureElement == null;
PDFParentTree parentTree = logicalStructureHandler.getParentTree();
PDFStructTreeRoot structTreeRoot = pdfFactory.getDocument().makeStructTreeRoot(parentTree);
rootStructureElement = createStructureElement("root", structTreeRoot, null);
structTreeRoot.addKid(rootStructureElement);
}
void setEventBroadcaster(EventBroadcaster eventBroadcaster) {
this.eventBroadcaster = eventBroadcaster;
}
public void startPageSequence(Locale language, String role) {
ancestors = new LinkedList<PDFStructElem>();
PDFStructElem structElem = createStructureElement("page-sequence", rootStructureElement, role);
if (language != null) {
structElem.setLanguage(language);
}
rootStructureElement.addKid(structElem);
ancestors.add(structElem);
}
private PDFStructElem createStructureElement(String name, PDFObject parent, String role) {
PDFName structureType = FOToPDFRoleMap.mapFormattingObject(name, role, parent, eventBroadcaster);
return pdfFactory.getDocument().makeStructureElement(structureType, parent);
}
public void endPageSequence() {
}
public StructureTreeElement startNode(String name, Attributes attributes) {
PDFStructElem parent = ancestors.getFirst();
String role = attributes.getValue("role");
PDFStructElem structElem = createStructureElement(name, parent, role);
setSpanAttributes(structElem, attributes);
parent.addKid(structElem);
ancestors.addFirst(structElem);
return structElem;
}
private void setSpanAttributes(PDFStructElem structElem, Attributes attributes) {
String columnSpan = attributes.getValue("number-columns-spanned");
if (columnSpan != null) {
structElem.setTableAttributeColSpan(Integer.parseInt(columnSpan));
}
String rowSpan = attributes.getValue("number-rows-spanned");
if (rowSpan != null) {
structElem.setTableAttributeRowSpan(Integer.parseInt(rowSpan));
}
}
public void endNode(String name) {
removeFirstAncestor();
}
private void removeFirstAncestor() {
ancestors.removeFirst();
}
public StructureTreeElement startImageNode(String name, Attributes attributes) {
PDFStructElem parent = ancestors.getFirst();
String role = attributes.getValue("role");
PDFStructElem structElem = createStructureElement(name, parent, role);
parent.addKid(structElem);
String altTextNode = attributes.getValue(ExtensionElementMapping.URI, "alt-text");
if (altTextNode != null) {
structElem.put("Alt", altTextNode);
} else {
structElem.put("Alt", "No alternate text specified");
}
ancestors.addFirst(structElem);
return structElem;
}
public StructureTreeElement startReferencedNode(String name, Attributes attributes) {
PDFStructElem parent = ancestors.getFirst();
String role = attributes.getValue("role");
PDFStructElem structElem;
if ("#PCDATA".equals(name)) {
structElem = new PDFStructElem.Placeholder(parent, name);
} else {
structElem = createStructureElement(name, parent, role);
}
parent.addKid(structElem);
ancestors.addFirst(structElem);
return structElem;
}
}
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