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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.analysis;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.miscellaneous.LengthFilter;
import org.apache.lucene.analysis.miscellaneous.Lucene43LengthFilter;
import org.apache.lucene.util.Version;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.assistedinject.Assisted;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.settings.IndexSettingsService;
public class LengthTokenFilterFactory extends AbstractTokenFilterFactory {
private final int min;
private final int max;
private final boolean enablePositionIncrements;
private static final String ENABLE_POS_INC_KEY = "enable_position_increments";
@Inject
public LengthTokenFilterFactory(Index index, IndexSettingsService indexSettingsService, @Assisted String name, @Assisted Settings settings) {
super(index, indexSettingsService.getSettings(), name, settings);
min = settings.getAsInt("min", 0);
max = settings.getAsInt("max", Integer.MAX_VALUE);
if (version.onOrAfter(Version.LUCENE_4_4) && settings.get(ENABLE_POS_INC_KEY) != null) {
throw new IllegalArgumentException(ENABLE_POS_INC_KEY + " is not supported anymore. Please fix your analysis chain or use"
+ " an older compatibility version (<=4.3) but beware that it might cause highlighting bugs.");
}
enablePositionIncrements = version.onOrAfter(Version.LUCENE_4_4) ? true : settings.getAsBoolean(ENABLE_POS_INC_KEY, true);
}
@Override
public TokenStream create(TokenStream tokenStream) {
if (version.onOrAfter(Version.LUCENE_4_4)) {
return new LengthFilter(tokenStream, min, max);
} else {
@SuppressWarnings("deprecation")
final TokenStream filter = new Lucene43LengthFilter(enablePositionIncrements, tokenStream, min, max);
return filter;
}
}
}