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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.intermediate.extensions;
-
- import java.awt.Point;
- import java.awt.Rectangle;
- import java.util.Stack;
-
- import org.xml.sax.Attributes;
- import org.xml.sax.SAXException;
- import org.xml.sax.helpers.DefaultHandler;
-
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
-
- import org.apache.fop.render.intermediate.IFDocumentNavigationHandler;
- import org.apache.fop.render.intermediate.IFException;
- import org.apache.fop.util.XMLUtil;
-
- /**
- * ContentHandler that handles the IF document navigation namespace.
- */
- public class DocumentNavigationHandler extends DefaultHandler
- implements DocumentNavigationExtensionConstants {
-
- /** Logger instance */
- protected static final Log log = LogFactory.getLog(DocumentNavigationHandler.class);
-
- private StringBuffer content = new StringBuffer();
- private Stack objectStack = new Stack();
-
- private IFDocumentNavigationHandler navHandler;
-
- private String structurePointer;
-
- /**
- * Main constructor.
- * @param navHandler the navigation handler that will receive the events
- */
- public DocumentNavigationHandler(IFDocumentNavigationHandler navHandler) {
- this.navHandler = navHandler;
- }
-
- /** {@inheritDoc} */
- public void startElement(String uri, String localName, String qName, Attributes attributes)
- throws SAXException {
- boolean handled = false;
- if (NAMESPACE.equals(uri)) {
- if (BOOKMARK_TREE.getLocalName().equals(localName)) {
- if (!objectStack.isEmpty()) {
- throw new SAXException(localName + " must be the root element!");
- }
- BookmarkTree bookmarkTree = new BookmarkTree();
- objectStack.push(bookmarkTree);
- } else if (BOOKMARK.getLocalName().equals(localName)) {
- String title = attributes.getValue("title");
- String s = attributes.getValue("starting-state");
- boolean show = !"hide".equals(s);
- Bookmark b = new Bookmark(title, show, null);
- Object o = objectStack.peek();
- if (o instanceof AbstractAction) {
- AbstractAction action = (AbstractAction)objectStack.pop();
- o = objectStack.peek();
- ((Bookmark)o).setAction(action);
- }
- if (o instanceof BookmarkTree) {
- ((BookmarkTree)o).addBookmark(b);
- } else {
- ((Bookmark)o).addChildBookmark(b);
- }
- objectStack.push(b);
- } else if (NAMED_DESTINATION.getLocalName().equals(localName)) {
- if (!objectStack.isEmpty()) {
- throw new SAXException(localName + " must be the root element!");
- }
- String name = attributes.getValue("name");
- NamedDestination dest = new NamedDestination(name, null);
- objectStack.push(dest);
- } else if (LINK.getLocalName().equals(localName)) {
- if (!objectStack.isEmpty()) {
- throw new SAXException(localName + " must be the root element!");
- }
- Rectangle targetRect = XMLUtil.getAttributeAsRectangle(attributes, "rect");
- structurePointer = attributes.getValue("ptr");
- Link link = new Link(null, targetRect);
- objectStack.push(link);
- } else if (GOTO_XY.getLocalName().equals(localName)) {
- String idref = attributes.getValue("idref");
- GoToXYAction action;
- if (idref != null) {
- action = new GoToXYAction(idref);
- } else {
- String id = attributes.getValue("id");
- int pageIndex = XMLUtil.getAttributeAsInt(attributes, "page-index");
- final Point location;
- if (pageIndex < 0) {
- location = null;
- } else {
- final int x = XMLUtil
- .getAttributeAsInt(attributes, "x");
- final int y = XMLUtil
- .getAttributeAsInt(attributes, "y");
- location = new Point(x, y);
- }
- action = new GoToXYAction(id, pageIndex, location);
- }
- if (structurePointer != null) {
- action.setStructurePointer(structurePointer);
- }
- objectStack.push(action);
- } else if (GOTO_URI.getLocalName().equals(localName)) {
- String id = attributes.getValue("id");
- String gotoURI = attributes.getValue("uri");
- String showDestination = attributes.getValue("show-destination");
- boolean newWindow = "new".equals(showDestination);
- URIAction action = new URIAction(gotoURI, newWindow);
- if (id != null) {
- action.setId(id);
- }
- if (structurePointer != null) {
- action.setStructurePointer(structurePointer);
- }
- objectStack.push(action);
- } else {
- throw new SAXException(
- "Invalid element '" + localName + "' in namespace: " + uri);
- }
- handled = true;
- }
- if (!handled) {
- if (NAMESPACE.equals(uri)) {
- throw new SAXException("Unhandled element '" + localName + "' in namespace: "
- + uri);
- } else {
- log.warn("Unhandled element '" + localName + "' in namespace: " + uri);
- }
- }
- }
-
- /** {@inheritDoc} */
- public void endElement(String uri, String localName, String qName) throws SAXException {
- if (NAMESPACE.equals(uri)) {
- try {
- if (BOOKMARK_TREE.getLocalName().equals(localName)) {
- BookmarkTree tree = (BookmarkTree)objectStack.pop();
- if (hasNavigation()) {
- this.navHandler.renderBookmarkTree(tree);
- }
- } else if (BOOKMARK.getLocalName().equals(localName)) {
- if (objectStack.peek() instanceof AbstractAction) {
- AbstractAction action = (AbstractAction)objectStack.pop();
- Bookmark b = (Bookmark)objectStack.pop();
- b.setAction(action);
- } else {
- objectStack.pop();
- }
- } else if (NAMED_DESTINATION.getLocalName().equals(localName)) {
- AbstractAction action = (AbstractAction)objectStack.pop();
- NamedDestination dest = (NamedDestination)objectStack.pop();
- dest.setAction(action);
- if (hasNavigation()) {
- this.navHandler.renderNamedDestination(dest);
- }
- } else if (LINK.getLocalName().equals(localName)) {
- AbstractAction action = (AbstractAction)objectStack.pop();
- Link link = (Link)objectStack.pop();
- link.setAction(action);
- if (hasNavigation()) {
- this.navHandler.renderLink(link);
- }
- } else if (localName.startsWith("goto-")) {
- if (objectStack.size() == 1) {
- //Stand-alone action
- AbstractAction action = (AbstractAction)objectStack.pop();
- if (hasNavigation()) {
- this.navHandler.addResolvedAction(action);
- }
- }
- }
- } catch (IFException ife) {
- throw new SAXException(ife);
- }
- }
- content.setLength(0); // Reset text buffer (see characters())
- }
-
- private boolean hasNavigation() {
- return this.navHandler != null;
- }
-
- /** {@inheritDoc} */
- public void characters(char[] ch, int start, int length) throws SAXException {
- content.append(ch, start, length);
- }
-
- /** {@inheritDoc} */
- public void endDocument() throws SAXException {
- assert objectStack.isEmpty();
- }
-
- }
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