Thanks for the reply Erik. However, my follow up question is this:
What about the block of code that appears in the startElement() method:
if(atts.getLength()>0){
attributeMap=new HashMap();
Do we need to modify it at all in anyway? Your suggestion works, but isn't
this redundant?
Just wondering.
Fayyaz
Erik Hatcher wrote:
>
> Fayyaz - that is the incorrect action to take. That will cause
> future documents to have fields from all previous ones! All you
> have to do is:
>
> private HashMap attributeMap = new HashMap();
>
> Erik
>
>
> On Dec 6, 2007, at 9:53 PM, syedfa wrote:
>
>>
>> Thanks very much for your reply. I commented out the line:
>>
>> attributeMap.clear();
>>
>> in the startElement() method, and the code ran!
>>
>> Thanks for your prompt reply, and my apologies for the delay in
>> responding.
>>
>> All the best.
>> Fayyaz
>>
>>
>> Michael McCandless-2 wrote:
>>>
>>>
>>> I think you need to initialize attributeMap, eg add " = new HashMap
>>> ()" in
>>> the declaration?
>>>
>>> Mike
>>>
>>> "syedfa" <[EMAIL PROTECTED]> wrote:
>>>>
>>>> Dear Fellow Java & Lucene developers:
>>>>
>>>> I am a Java developer learning lucene and I am currently going
>>>> through
>>>> the
>>>> book Lucene in Action. At present, I am trying to run the sample
>>>> code
>>>> for
>>>> indexing an xml document using sax. My code has been slightly
>>>> updated
>>>> for
>>>> Lucene version 2.2:
>>>>
>>>> /*
>>>> * To change this template, choose Tools | Templates
>>>> * and open the template in the editor.
>>>> */
>>>>
>>>> package lucenexml;
>>>>
>>>>
>>>> import java.io.File;
>>>> import java.io.FileInputStream;
>>>> import java.io.InputStream;
>>>> import java.io.IOException;
>>>> import java.util.HashMap;
>>>> import java.util.Iterator;
>>>>
>>>> import org.xml.sax.helpers.DefaultHandler;
>>>> import org.xml.sax.SAXException;
>>>> import org.xml.sax.Attributes;
>>>>
>>>> import javax.xml.parsers.SAXParser;
>>>> import javax.xml.parsers.SAXParserFactory;
>>>> import javax.xml.parsers.ParserConfigurationException;
>>>>
>>>>
>>>> import org.apache.lucene.document.Document;
>>>> import org.apache.lucene.document.Field;
>>>>
>>>> /**
>>>> *
>>>> * @author fayyaz
>>>> */
>>>> public class SAXXMLHandler extends DefaultHandler implements
>>>> DocumentHandler{
>>>>
>>>> private StringBuffer elementBuffer=new StringBuffer();
>>>> private HashMap attributeMap;
>>>>
>>>> private Document doc;
>>>> /**
>>>> * @param args the command line arguments
>>>> */
>>>> public static void main(String[] args) throws Exception {
>>>> // TODO code application logic here
>>>> SAXXMLHandler handler=new SAXXMLHandler();
>>>> Document doc=handler.getDocument(new FileInputStream(new
>>>> File(args[0])));
>>>> System.out.println(doc);
>>>> }
>>>>
>>>> public Document getDocument(InputStream is) throws
>>>> DocumentHandlerException{
>>>>
>>>> SAXParserFactory spf=SAXParserFactory.newInstance();
>>>>
>>>> try{
>>>> SAXParser parser=spf.newSAXParser();
>>>> parser.parse(is, this);
>>>>
>>>> }
>>>> catch (IOException e){
>>>> throw new DocumentHandlerException("Cannot parse XML
>>>> document",
>>>> e);
>>>> }
>>>> catch (ParserConfigurationException e) {
>>>> throw new DocumentHandlerException("Cannot parse XML
>>>> document",
>>>> e);
>>>> }
>>>> catch (SAXException e){
>>>> throw new DocumentHandlerException("Cannot parse XML
>>>> document",
>>>> e);
>>>> }
>>>> return doc;
>>>> }
>>>>
>>>> public void startDocument(){
>>>> doc=new Document();
>>>> }
>>>>
>>>> public void startElement(String uri, String localName, String
>>>> qName,
>>>> Attributes atts) throws SAXException{
>>>>
>>>> elementBuffer.setLength(0);
>>>> attributeMap.clear();
>>>> if(atts.getLength()>0){
>>>> attributeMap=new HashMap();
>>>> for(int i=0; i<atts.getLength(); i++){
>>>> attributeMap.put(atts.getQName(i), atts.getValue
>>>> (i));
>>>> }
>>>> }
>>>> }
>>>>
>>>> public void characters(char[] text, int start, int length){
>>>> elementBuffer.append(text, start, length);
>>>> }
>>>>
>>>> public void endElement(String uri, String localName, String
>>>> qName)
>>>> throws SAXException{
>>>> if(qName.equals("address-book")){
>>>> return;
>>>> }
>>>>
>>>> else if(qName.equals("contact")){
>>>> Iterator iter=attributeMap.keySet().iterator();
>>>> while(iter.hasNext()){
>>>> String attName=(String)iter.next();
>>>> String attValue=(String)attributeMap.get(attName);
>>>> doc.add(new Field(qName, elementBuffer.toString(),
>>>> Field.Store.YES,Field.Index.NO));
>>>> }
>>>> }
>>>> }
>>>> }
>>>>
>>>>
>>>> However, although the code compiles, I get the following runtime
>>>> error
>>>> when
>>>> I pass the file addressbook.xml (which is used in the book) as a
>>>> runtime
>>>> argument:
>>>>
>>>> Exception in thread "main" java.lang.NullPointerException
>>>> at lucenexml.SAXXMLHandler.startElement
>>>> (SAXXMLHandler.java:81)
>>>> at
>>>> org.apache.xerces.parsers.AbstractSAXParser.startElement
>>>> (Unknown
>>>> Source)
>>>> at
>>>> org.apache.xerces.impl.dtd.XMLDTDValidator.startElement
>>>> (Unknown
>>>> Source)
>>>> at
>>>> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartEleme
>>>> nt(Unknown
>>>> Source)
>>>> at
>>>> org.apache.xerces.impl.XMLDocumentScannerImpl
>>>> $ContentDispatcher.scanRootElementHook(Unknown
>>>> Source)
>>>> at
>>>> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl
>>>> $FragmentContentDispatcher.dispatch(Unknown
>>>> Source)
>>>> at
>>>> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument
>>>> (Unknown
>>>> Source)
>>>> at org.apache.xerces.parsers.XML11Configuration.parse
>>>> (Unknown
>>>> Source)
>>>> at org.apache.xerces.parsers.XML11Configuration.parse
>>>> (Unknown
>>>> Source)
>>>> at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
>>>> at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown
>>>> Source)
>>>> at
>>>> org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse
>>>> (Unknown
>>>> Source)
>>>> at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown
>>>> Source)
>>>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:198)
>>>> at lucenexml.SAXXMLHandler.getDocument(SAXXMLHandler.java:
>>>> 59)
>>>> at lucenexml.SAXXMLHandler.main(SAXXMLHandler.java:49)
>>>> Java Result: 1
>>>>
>>>> What am I doing wrong? Any help would be greatly appreciated.
>>>>
>>>> Thanks in advance.
>>>> Sincerely;
>>>> Fayyaz
>>>>
>>>> --
>>>> View this message in context:
>>>> http://www.nabble.com/Error-running-Lucene-in-Action-code-
>>>> tf4947242.html#a14164565
>>>> Sent from the Lucene - Java Users mailing list archive at
>>>> Nabble.com.
>>>>
>>>>
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>>>>
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>>>
>>
>> --
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>> Lucene-in-Action-code-tf4947242.html#a14205907
>> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>>
>>
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