/*
* eXist Open Source Native XML Database
* Copyright (C) 2004-09 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id$
*/
package org.exist.xquery.functions.text;
import java.util.ArrayList;
import java.util.List;
import org.exist.dom.NodeSet;
import org.exist.storage.analysis.Tokenizer;
import org.exist.xquery.Constants;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.functions.fn.DeprecatedExtRegexp;
import org.exist.xquery.value.Sequence;
/**
* @author Wolfgang Meier (wolfgang@exist-db.org)
*/
public abstract class AbstractMatchFunction extends DeprecatedExtRegexp {
public AbstractMatchFunction(XQueryContext context, int type, FunctionSignature signature) {
super(context, type, signature);
}
public abstract Sequence evalQuery(NodeSet nodes, List<String> terms) throws XPathException;
public NodeSet mergeResults(NodeSet[] hits) {
NodeSet result = hits[0];
if(result != null) {
for(int k = 1; k < hits.length; k++) {
if(hits[k] != null)
{result = (type == Constants.FULLTEXT_AND ?
result.deepIntersection(hits[k]) : result.union(hits[k]));}
}
return result;
} else
{return NodeSet.EMPTY_SET;}
}
protected List<String> getSearchTerms(XQueryContext context,
Sequence contextSequence)
throws XPathException {
final String searchString = getArgument(1).eval(contextSequence)
.getStringValue();
final List<String> tokens = new ArrayList<String>();
final Tokenizer tokenizer = context.getBroker().getTextEngine()
.getTokenizer();
tokenizer.setText(searchString);
org.exist.storage.analysis.TextToken token;
String word;
while (null != (token = tokenizer.nextToken(true))) {
word = token.getText();
tokens.add(word);
}
return tokens;
}
}