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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.PDFStructElem;
-
- class PDFStructureTreeBuilder implements StructureTreeEventHandler {
-
- private PDFFactory pdfFactory;
-
- private PDFLogicalStructureHandler logicalStructureHandler;
-
- private EventBroadcaster eventBroadcaster;
-
- private LinkedList<PDFStructElem> ancestors = new LinkedList<PDFStructElem>();
-
- void setPdfFactory(PDFFactory pdfFactory) {
- this.pdfFactory = pdfFactory;
- }
-
- void setLogicalStructureHandler(PDFLogicalStructureHandler logicalStructureHandler) {
- this.logicalStructureHandler = logicalStructureHandler;
- }
-
- void setEventBroadcaster(EventBroadcaster eventBroadcaster) {
- this.eventBroadcaster = eventBroadcaster;
- }
-
- public void startPageSequence(Locale locale) {
- ancestors = new LinkedList<PDFStructElem>();
- ancestors.add(logicalStructureHandler.createPageSequence(locale));
- }
-
- public void endPageSequence() {
- }
-
- public StructureTreeElement startNode(String name, Attributes attributes) {
- PDFStructElem parent = ancestors.getFirst();
- String role = attributes.getValue("role");
- PDFStructElem created;
- created = pdfFactory.makeStructureElement(
- FOToPDFRoleMap.mapFormattingObject(name, role, parent, eventBroadcaster), parent);
- parent.addKid(created);
- ancestors.addFirst(created);
- return created;
- }
-
- 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 created;
- created = pdfFactory.makeStructureElement(
- FOToPDFRoleMap.mapFormattingObject(name, role, parent, eventBroadcaster), parent);
- parent.addKid(created);
- String altTextNode = attributes.getValue(ExtensionElementMapping.URI, "alt-text");
- if (altTextNode != null) {
- created.put("Alt", altTextNode);
- } else {
- created.put("Alt", "No alternate text specified");
- }
- ancestors.addFirst(created);
- return created;
- }
-
- public void endImageNode(String name) {
- removeFirstAncestor();
- }
-
- public StructureTreeElement startReferencedNode(String name, Attributes attributes) {
- PDFStructElem parent = ancestors.getFirst();
- String role = attributes.getValue("role");
- PDFStructElem created;
- if ("#PCDATA".equals(name)) {
- created = new PDFStructElem.Placeholder(parent, name);
- } else {
- created = pdfFactory.makeStructureElement(
- FOToPDFRoleMap.mapFormattingObject(name, role, parent,
- eventBroadcaster), parent);
- }
- parent.addKid(created);
- ancestors.addFirst(created);
- return created;
- }
-
- public void endReferencedNode(String name) {
- removeFirstAncestor();
- }
-
- }
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