/*
* 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.pattern.PatternReplaceCharFilter;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.common.Strings;
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.io.Reader;
import java.util.regex.Pattern;
@AnalysisSettingsRequired
public class PatternReplaceCharFilterFactory extends AbstractCharFilterFactory {
private final Pattern pattern;
private final String replacement;
@Inject
public PatternReplaceCharFilterFactory(Index index, @IndexSettings Settings indexSettings, @Assisted String name, @Assisted Settings settings) {
super(index, indexSettings, name);
if (!Strings.hasLength(settings.get("pattern"))) {
throw new ElasticsearchIllegalArgumentException("pattern is missing for [" + name + "] char filter of type 'pattern_replace'");
}
pattern = Pattern.compile(settings.get("pattern"));
replacement = settings.get("replacement", ""); // when not set or set to "", use "".
}
public Pattern getPattern() {
return pattern;
}
public String getReplacement() {
return replacement;
}
@Override
public Reader create(Reader tokenStream) {
return new PatternReplaceCharFilter(pattern, replacement, tokenStream);
}
}