001    package nu.validator.xml;
002    
003    import org.xml.sax.Attributes;
004    import org.xml.sax.SAXException;
005    import org.xml.sax.XMLReader;
006    import org.xml.sax.helpers.AttributesImpl;
007    import org.xml.sax.helpers.XMLFilterImpl;
008    
009    public class XhtmlIdFilter extends XMLFilterImpl {
010    
011        public XhtmlIdFilter() {
012            super();
013        }
014    
015        public XhtmlIdFilter(XMLReader parent) {
016            super(parent);
017        }
018    
019        /**
020         * @see org.xml.sax.helpers.XMLFilterImpl#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
021         */
022        public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
023            if ("http://www.w3.org/1999/xhtml".equals(uri)) {
024                int index = atts.getIndex("", "id");
025                if (index != -1 && !"ID".equals(atts.getType(index))) {
026                    AttributesImpl ai = new AttributesImpl(atts);
027                    ai.setType(index, "ID");
028                    super.startElement(uri, localName, qName, ai);
029                } else {
030                    super.startElement(uri, localName, qName, atts);                
031                }
032            } else {
033                super.startElement(uri, localName, qName, atts);
034            }
035        }
036    }