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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.analysis.common;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.miscellaneous.ASCIIFoldingFilter;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.analysis.AbstractTokenFilterFactory;
import org.elasticsearch.index.analysis.MultiTermAwareComponent;
import org.elasticsearch.index.analysis.TokenFilterFactory;
/**
* Factory for ASCIIFoldingFilter.
*/
public class ASCIIFoldingTokenFilterFactory extends AbstractTokenFilterFactory
implements MultiTermAwareComponent {
public static final ParseField PRESERVE_ORIGINAL = new ParseField("preserve_original");
public static final boolean DEFAULT_PRESERVE_ORIGINAL = false;
private final boolean preserveOriginal;
public ASCIIFoldingTokenFilterFactory(IndexSettings indexSettings, Environment environment,
String name, Settings settings) {
super(indexSettings, name, settings);
preserveOriginal = settings.getAsBooleanLenientForPreEs6Indices(
indexSettings.getIndexVersionCreated(), PRESERVE_ORIGINAL.getPreferredName(),
DEFAULT_PRESERVE_ORIGINAL, deprecationLogger);
}
@Override
public TokenStream create(TokenStream tokenStream) {
return new ASCIIFoldingFilter(tokenStream, preserveOriginal);
}
@Override
public Object getMultiTermComponent() {
if (preserveOriginal == false) {
return this;
} else {
// See https://issues.apache.org/jira/browse/LUCENE-7536 for the reasoning
return new TokenFilterFactory() {
@Override
public String name() {
return ASCIIFoldingTokenFilterFactory.this.name();
}
@Override
public TokenStream create(TokenStream tokenStream) {
return new ASCIIFoldingFilter(tokenStream, false);
}
};
}
}
}