package org.apache.lucene.analysis.core;
/*
* 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.
*/
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.TypeAttribute;
import org.apache.lucene.analysis.util.FilteringTokenFilter;
import java.io.IOException;
import java.util.Set;
/**
* Removes tokens whose types appear in a set of blocked types from a token stream.
*/
public final class TypeTokenFilter extends FilteringTokenFilter {
private final Set<String> stopTypes;
private final TypeAttribute typeAttribute = addAttribute(TypeAttribute.class);
private final boolean useWhiteList;
public TypeTokenFilter(boolean enablePositionIncrements, TokenStream input, Set<String> stopTypes, boolean useWhiteList) {
super(enablePositionIncrements, input);
this.stopTypes = stopTypes;
this.useWhiteList = useWhiteList;
}
public TypeTokenFilter(boolean enablePositionIncrements, TokenStream input, Set<String> stopTypes) {
this(enablePositionIncrements, input, stopTypes, false);
}
/**
* By default accept the token if its type is not a stop type.
* When the useWhiteList parameter is set to true then accept the token if its type is contained in the stopTypes
*/
@Override
protected boolean accept() {
return useWhiteList == stopTypes.contains(typeAttribute.type());
}
}