001    /*
002     * Copyright (c) 2005 Marko Karppinen & Co. LLC
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    package fi.karppinen.xml;
024    
025    import gnu.xml.pipeline.EventConsumer;
026    import gnu.xml.pipeline.EventFilter;
027    
028    import java.util.Map;
029    
030    import org.xml.sax.SAXException;
031    
032    /**
033     * Replaces PIs of the form <code>&lt;?string <var>key</var>?&gt;</code> with 
034     * the <code>toString()</code> of the corresponding value in the <code>Map</code> 
035     * given to the constructor.
036     * 
037     * @version $Id: StringInjector.java,v 1.1 2006/10/30 19:57:09 hsivonen Exp $
038     * @author hsivonen
039     */
040    public class StringInjector extends EventFilter {
041    
042        private Map map;
043        
044        /**
045         * 
046         */
047        public StringInjector(Map map) {
048            super();
049            this.map = map;
050            setContentHandler(this);
051        }
052    
053        /**
054         * @param ec
055         */
056        public StringInjector(Map map, EventConsumer ec) {
057            super(ec);
058            this.map = map;
059            setContentHandler(this);
060        }
061    
062        /**
063         * @see org.xml.sax.ContentHandler#processingInstruction(java.lang.String, java.lang.String)
064         */
065        public void processingInstruction(String target, String data)
066                throws SAXException {
067            if ("string".equals(target)) {
068                String trimmed = data.trim();
069                Object val = map.get(trimmed);
070                if(val != null) {
071                    char[] chars = val.toString().toCharArray();
072                    super.characters(chars, 0, chars.length);
073                } else {
074                    throw new SAXException("No value for " + trimmed);
075                }
076            } else {
077                super.processingInstruction(target, data);
078            }
079        }
080    
081    }