001    /*
002     * Copyright (c) 2003, 2004 Taavi Hupponen
003     *
004     * Permission is hereby granted, free of charge, to any person obtaining a 
005     * copy of this software and associated documentation files (the "Software"), 
006     * to deal in the Software without restriction, including without limitation 
007     * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
008     * and/or sell copies of the Software, and to permit persons to whom the 
009     * Software is furnished to do so, subject to the following conditions:
010     *
011     * The above copyright notice and this permission notice shall be included in 
012     * all copies or substantial portions of the Software.
013     *
014     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
015     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
016     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
017     * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
018     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
019     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
020     * DEALINGS IN THE SOFTWARE.
021     */
022    
023    /*
024     * Created on 15.4.2004
025     *
026     * 2004-08-29 fixed namespaces -- hsivonen
027     */
028    package fi.iki.hsivonen.xml;
029    
030    import gnu.xml.pipeline.EventConsumer;
031    import gnu.xml.pipeline.EventFilter;
032    
033    import org.xml.sax.Attributes;
034    import org.xml.sax.SAXException;
035    
036    /**
037     * Grabs the contents of the title element to be returned later.
038     * 
039     * @author taavi
040     *
041     * 
042     */
043    public class TitleGrabber extends EventFilter {
044    
045        /**
046         * The XHTML namespace URI
047         */
048        private final static String XHTML_NS = "http://www.w3.org/1999/xhtml";
049        
050        private StringBuilder title;
051        private boolean headOpen, titleOpen;
052    
053        public TitleGrabber(EventConsumer next) {
054            super(next);
055            setContentHandler(this);
056            headOpen = false;
057            titleOpen = false;
058            title = new StringBuilder();
059        }
060    
061        /**
062         * 
063         */
064        public TitleGrabber() {
065            super();
066            setContentHandler(this);
067        }
068    
069        public String getTitle() {
070            return title.toString();
071        }
072    
073        public void endElement(String uri, String local, String qname) throws SAXException {
074            if ("head".equals(local) && XHTML_NS.equals(uri)) {
075                headOpen = false;
076            } else if ("title".equals(local) && XHTML_NS.equals(uri)) {
077                titleOpen = false;
078            }
079    
080            super.endElement(uri, local, qname);
081    
082        }
083    
084        public void startElement(String uri, String local, String qname, Attributes attributes) throws SAXException {
085            if ("head".equals(local) && XHTML_NS.equals(uri)) {
086                headOpen = true;
087            } else if ("title".equals(local) && XHTML_NS.equals(uri)) {
088                titleOpen = true;
089            }
090    
091            super.startElement(uri, local, qname, attributes);
092    
093        }
094    
095        public void characters(char[] arg0, int arg1, int arg2) throws SAXException {
096            if (headOpen && titleOpen) {
097                title.append(arg0, arg1, arg2);
098            }
099            super.characters(arg0, arg1, arg2);
100        }
101    
102    }