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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.extensions;
-
- import java.util.Stack;
-
- import org.xml.sax.Attributes;
- import org.xml.sax.SAXException;
- import org.xml.sax.helpers.AttributesImpl;
- import org.xml.sax.helpers.DefaultHandler;
-
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
-
- import org.apache.fop.util.ContentHandlerFactory;
- import org.apache.fop.util.ContentHandlerFactory.ObjectBuiltListener;
-
- /**
- * ContentHandler (parser) for restoring PDF extension objects from XML.
- */
- public class PDFExtensionHandler extends DefaultHandler implements ContentHandlerFactory.ObjectSource {
-
- /** Logger instance */
- protected static final Log log = LogFactory.getLog(PDFExtensionHandler.class);
-
- private PDFExtensionAttachment returnedObject;
- private ObjectBuiltListener listener;
-
- // PDFEmbeddedFileAttachment related state
- private Attributes lastAttributes;
-
- // PDFDictionaryAttachment related
- private Stack<PDFCollectionExtension> collections = new Stack<PDFCollectionExtension>();
- private boolean captureContent;
- private StringBuffer characters;
-
- @Override
- public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
- if (PDFExtensionAttachment.CATEGORY.equals(uri)) {
- if (localName.equals(PDFEmbeddedFileAttachment.ELEMENT)) {
- lastAttributes = new AttributesImpl(attributes);
- } else if (PDFDictionaryType.Action.elementName().equals(localName)) {
- PDFActionExtension action = new PDFActionExtension();
- String id = attributes.getValue(PDFDictionaryElement.ATT_ID);
- if (id != null) {
- action.setProperty(PDFDictionaryExtension.PROPERTY_ID, id);
- }
- String type = attributes.getValue(PDFActionElement.ATT_TYPE);
- if (type != null) {
- action.setProperty(PDFActionExtension.PROPERTY_TYPE, type);
- }
- collections.push(action);
- } else if (PDFObjectType.Array.elementName().equals(localName)) {
- PDFArrayExtension array = new PDFArrayExtension();
- String key = attributes.getValue(PDFCollectionEntryElement.ATT_KEY);
- if (key != null) {
- array.setKey(key);
- }
- collections.push(array);
- } else if (PDFDictionaryType.Catalog.elementName().equals(localName)) {
- PDFCatalogExtension catalog = new PDFCatalogExtension();
- collections.push(catalog);
- } else if (PDFDictionaryType.Dictionary.elementName().equals(localName)) {
- PDFDictionaryExtension dictionary = new PDFDictionaryExtension();
- String key = attributes.getValue(PDFCollectionEntryElement.ATT_KEY);
- if (key != null) {
- dictionary.setKey(key);
- }
- collections.push(dictionary);
- } else if (PDFDictionaryType.Layer.elementName().equals(localName)) {
- PDFLayerExtension layer = new PDFLayerExtension();
- String id = attributes.getValue(PDFDictionaryElement.ATT_ID);
- if (id != null) {
- layer.setProperty(PDFDictionaryExtension.PROPERTY_ID, id);
- }
- collections.push(layer);
- } else if (PDFDictionaryType.Navigator.elementName().equals(localName)) {
- PDFNavigatorExtension navigator = new PDFNavigatorExtension();
- String id = attributes.getValue(PDFDictionaryElement.ATT_ID);
- if (id != null) {
- navigator.setProperty(PDFDictionaryExtension.PROPERTY_ID, id);
- }
- collections.push(navigator);
- } else if (PDFDictionaryType.Page.elementName().equals(localName)) {
- PDFPageExtension page = new PDFPageExtension();
- String pageNumbers = attributes.getValue(PDFPageElement.ATT_PAGE_NUMBERS);
- if (pageNumbers != null) {
- page.setProperty(PDFPageExtension.PROPERTY_PAGE_NUMBERS, pageNumbers);
- }
- collections.push(page);
- } else if (PDFDictionaryType.Info.elementName().equals(localName)) {
- PDFDocumentInformationExtension info = new PDFDocumentInformationExtension();
- collections.push(info);
- } else if (PDFObjectType.hasValueOfElementName(localName)) {
- PDFCollectionEntryExtension entry;
- if (PDFObjectType.Reference.elementName().equals(localName)) {
- entry = new PDFReferenceExtension();
- } else {
- entry = new PDFCollectionEntryExtension(PDFObjectType.valueOfElementName(localName));
- }
- String key = attributes.getValue(PDFCollectionEntryElement.ATT_KEY);
- if (key != null) {
- entry.setKey(key);
- }
- if (entry instanceof PDFReferenceExtension) {
- String refid = attributes.getValue(PDFReferenceElement.ATT_REFID);
- if (refid != null) {
- ((PDFReferenceExtension) entry).setReferenceId(refid);
- }
- }
- if (!collections.empty()) {
- PDFCollectionExtension collection = collections.peek();
- collection.addEntry(entry);
- if (!(entry instanceof PDFReferenceExtension)) {
- captureContent = true;
- }
- }
- } else {
- throw new SAXException("Unhandled element " + localName + " in namespace: " + uri);
- }
- } else {
- log.warn("Unhandled element " + localName + " in namespace: " + uri);
- }
- }
-
- @Override
- public void characters(char[] data, int start, int length) throws SAXException {
- if (captureContent) {
- if (characters == null) {
- characters = new StringBuffer((length < 16) ? 16 : length);
- }
- characters.append(data, start, length);
- }
- }
-
- @Override
- public void endElement(String uri, String localName, String qName) throws SAXException {
- if (PDFExtensionAttachment.CATEGORY.equals(uri)) {
- if (PDFEmbeddedFileAttachment.ELEMENT.equals(localName)) {
- String name = lastAttributes.getValue("name");
- String src = lastAttributes.getValue("src");
- String desc = lastAttributes.getValue("description");
- this.lastAttributes = null;
- this.returnedObject = new PDFEmbeddedFileAttachment(name, src, desc);
- } else if (PDFDictionaryType.hasValueOfElementName(localName)) {
- if (!collections.empty() && (collections.peek() instanceof PDFDictionaryExtension)) {
- PDFDictionaryExtension dictionary = (PDFDictionaryExtension) collections.pop();
- if (!collections.empty()) {
- PDFCollectionExtension collectionOuter = collections.peek();
- collectionOuter.addEntry(dictionary);
- } else if (dictionary.getDictionaryType() != PDFDictionaryType.Dictionary) {
- this.returnedObject = new PDFDictionaryAttachment(dictionary);
- } else {
- throw new SAXException(
- new IllegalStateException("generic dictionary not permitted at outer level"));
- }
- } else {
- throw new SAXException(new IllegalStateException("collections stack is empty or not a dictionary"));
- }
- } else if (PDFObjectType.Array.elementName().equals(localName)) {
- if (!collections.empty() && (collections.peek() instanceof PDFArrayExtension)) {
- PDFArrayExtension array = (PDFArrayExtension) collections.pop();
- if (!collections.empty()) {
- PDFCollectionExtension collectionOuter = collections.peek();
- collectionOuter.addEntry(array);
- } else {
- throw new SAXException(new IllegalStateException("array not permitted at outer level"));
- }
- } else {
- throw new SAXException(new IllegalStateException("collections stack is empty or not an array"));
- }
- } else if (PDFObjectType.hasValueOfElementName(localName)) {
- if (!collections.empty()) {
- PDFCollectionExtension collection = collections.peek();
- PDFCollectionEntryExtension entry = collection.getLastEntry();
- if (entry != null) {
- if (characters != null) {
- entry.setValue(characters.toString());
- characters = null;
- }
- } else {
- throw new SAXException(new IllegalStateException("no current entry"));
- }
- } else {
- throw new SAXException(new IllegalStateException("entry not permitted at outer level"));
- }
- }
- }
- captureContent = false;
- }
-
- @Override
- public void endDocument() throws SAXException {
- if (listener != null) {
- listener.notifyObjectBuilt(getObject());
- }
- }
-
- public Object getObject() {
- return returnedObject;
- }
-
- public void setObjectBuiltListener(ObjectBuiltListener listener) {
- this.listener = listener;
- }
- }
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