/*
* 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.lucene.analysis.miscellaneous;
import java.util.Map;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.util.TokenFilterFactory;
/**
* Factory for {@link KeywordRepeatFilter}.
*
* Since {@link KeywordRepeatFilter} emits two tokens for every input token, and any tokens that aren't transformed
* later in the analysis chain will be in the document twice. Therefore, consider adding
* {@link RemoveDuplicatesTokenFilterFactory} later in the analysis chain.
*/
public final class KeywordRepeatFilterFactory extends TokenFilterFactory {
/** Creates a new KeywordRepeatFilterFactory */
public KeywordRepeatFilterFactory(Map<String,String> args) {
super(args);
if (!args.isEmpty()) {
throw new IllegalArgumentException("Unknown parameters: " + args);
}
}
@Override
public TokenStream create(TokenStream input) {
return new KeywordRepeatFilter(input);
}
}