org.apache.solr.analysis.RemoveDuplicatesTokenFilter Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.analysis;
import org.apache.lucene.analysis.Token;
import org.apache.lucene.analysis.TokenStream;
import org.apache.solr.util.ArraysUtils;
import java.io.IOException;
/**
* A TokenFilter which filters out Tokens at the same position and Term
* text as the previous token in the stream.
*/
public class RemoveDuplicatesTokenFilter extends BufferedTokenStream {
public RemoveDuplicatesTokenFilter(TokenStream input) {super(input);}
protected Token process(Token t) throws IOException {
Token tok = read();
while (tok != null && tok.getPositionIncrement()==0) {
if (null != t) {
write(t);
t = null;
}
boolean dup=false;
for (Token outTok : output()) {
int tokLen = tok.termLength();
if (outTok.termLength() == tokLen && ArraysUtils.equals(outTok.termBuffer(), 0, tok.termBuffer(), 0, tokLen)) {
dup=true;
//continue;;
}
}
if (!dup){
write(tok);
}
tok = read();
}
if (tok != null) {
pushBack(tok);
}
return t;
}
}