/*
* 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.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.pattern.PatternCaptureGroupTokenFilter;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
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.IndexSettings;
import java.util.regex.Pattern;
@AnalysisSettingsRequired
public class PatternCaptureGroupTokenFilterFactory extends AbstractTokenFilterFactory {
private final Pattern[] patterns;
private final boolean preserveOriginal;
private static final String PATTERNS_KEY = "patterns";
private static final String PRESERVE_ORIG_KEY = "preserve_original";
@Inject
public PatternCaptureGroupTokenFilterFactory(Index index, @IndexSettings Settings indexSettings, @Assisted String name,
@Assisted Settings settings) {
super(index, indexSettings, name, settings);
String[] regexes = settings.getAsArray(PATTERNS_KEY, null, false);
if (regexes == null) {
throw new ElasticsearchIllegalArgumentException("required setting '" + PATTERNS_KEY + "' is missing for token filter [" + name + "]");
}
patterns = new Pattern[regexes.length];
for (int i = 0; i < regexes.length; i++) {
patterns[i] = Pattern.compile(regexes[i]);
}
preserveOriginal = settings.getAsBoolean(PRESERVE_ORIG_KEY, true);
}
@Override
public TokenFilter create(TokenStream tokenStream) {
return new PatternCaptureGroupTokenFilter(tokenStream, preserveOriginal, patterns);
}
}