/**
* License Agreement for OpenSearchServer
*
* Copyright (C) 2012 Emmanuel Keller / Jaeksoft
*
* http://www.open-search-server.com
*
* This file is part of OpenSearchServer.
*
* OpenSearchServer is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* OpenSearchServer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenSearchServer.
* If not, see <http://www.gnu.org/licenses/>.
**/
package com.jaeksoft.searchlib.analysis.filter.stop;
import java.io.IOException;
import org.apache.lucene.analysis.TokenStream;
import com.jaeksoft.searchlib.analysis.filter.AbstractTermFilter;
public class PrefixSuffixFilter extends AbstractTermFilter {
private final PrefixArray prefixArray;
private final SuffixArray suffixArray;
private final boolean ignoreCase;
public PrefixSuffixFilter(TokenStream input, PrefixArray prefixArray,
SuffixArray suffixArray, boolean ignoreCase) {
super(input);
this.prefixArray = prefixArray;
this.suffixArray = suffixArray;
this.ignoreCase = ignoreCase;
}
private final boolean keepTerm(String term) {
if (ignoreCase)
term = term.toLowerCase();
if (prefixArray != null)
if (prefixArray.match(term))
return false;
if (suffixArray != null)
if (suffixArray.match(term))
return false;
return true;
}
@Override
public final boolean incrementToken() throws IOException {
int skippedPositions = 0;
for (;;) {
if (!input.incrementToken())
return false;
if (keepTerm(this.termAtt.toString())) {
posIncrAtt.setPositionIncrement(posIncrAtt
.getPositionIncrement() + skippedPositions);
return true;
}
skippedPositions += posIncrAtt.getPositionIncrement();
}
}
}