This is the XML search class ...
Steve Carton
-----------------------
www.retrievalsystems.com
703/749-0012
Retrieval Systems Corporation
2071 Chain Bridge Road, Suite 510
Vienna, VA 22182
package rsc;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.document.Field;
import java.io.*;
import org.apache.lucene.search.*;
import org.w3c.dom.*;
import java.util.Enumeration;
import org.apache.xerces.dom.DocumentImpl;
/**
* <p>Title: XIndexSearcher</p>
* <p>Description: Extends the IndexSearcher class to provide a methods that performs a search and returns the results as a DOM document</p>
* <p>Company: Retrieval Systems Corporation</p>
* @author Steve Carton
* @version 2.0
*/
public class XIndexSearcher extends IndexSearcher {
/**
* XIndexSearcher -- constructor with path to Lucene indexes
*
* @param path String
* @throws IOException
*/
public XIndexSearcher(String path) throws IOException {
super(path);
}
/**
* xsearch -- search method that returns an XML DOM result.
*
* <p>Passes the query to the IndexSearcher.search method. Then turns the resulting hits to XML.
*
* @param query Query
* @throws IOException
* @return Document
*/
public org.w3c.dom.Document xsearch(Query query) throws IOException {
return hits2XML(super.search(query),query);
}
/**
* hits2XML -- converts the fields in the Hits object to an XML DOM document and returns that.
*
* @param hits Hits
* @param query Query
* @throws IOException
* @return Document
*/
public org.w3c.dom.Document hits2XML(Hits hits, Query query) throws IOException {
org.w3c.dom.Document XML = newDocument("HITS");
Element results = XML.getDocumentElement();
if (hits != null) {
results.setAttribute("LENGTH", "" + hits.length());
results.setAttribute("QUERY",query.toString());
int i=0; while (i<hits.length()) {
Element hit = makeXMLElement(results,"HIT");
hit.setAttribute("SCORE",""+hits.score(i));
org.apache.lucene.document.Document doc = hits.doc(i);
Enumeration it = doc.fields();
while (it.hasMoreElements()) {
Field field = (Field)it.nextElement();
Element efield = makeXMLElement(hit,"FIELD");
efield.setAttribute("NAME",field.name());
// efield.setAttribute("BOOST",""+field.getBoost());
efield.setAttribute("ISINDEXED",""+field.isIndexed());
efield.setAttribute("ISSTORED",""+field.isStored());
efield.setAttribute("ISTOKENIZED",""+field.isTokenized());
if (field.isStored()) {
efield.appendChild(efield.getOwnerDocument().createTextNode(field.stringValue()));
}
}
i++;
}
}
else results.setAttribute("LENGTH", "0");
return XML;
}
/**
* newDocument -- creates a new DOM document with a given document element. Uses the Apache Xerces DocumentImpl()
* class to create the DOM.
*
* @param root String
* @return Document
*/
private Document newDocument(String root) {
Document XML = new DocumentImpl();
XML.appendChild(XML.createElement(root));
return XML;
}
/**
* makeXMLElement -- creates a new element in a DOM under a specified node.
*
* @param parent Node
* @param nm String
* @return Element
* @author
*/
private Element makeXMLElement(Node parent, String nm) {
Element oNode = parent.getOwnerDocument().createElement(nm);
parent.appendChild(oNode);
return oNode;
}
}
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