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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 java.io.Reader;
import java.util.regex.Pattern;
import org.apache.lucene.analysis.pattern.PatternReplaceCharFilter;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.analysis.AbstractCharFilterFactory;
import org.elasticsearch.index.analysis.MultiTermAwareComponent;
public class PatternReplaceCharFilterFactory extends AbstractCharFilterFactory implements MultiTermAwareComponent {
private final Pattern pattern;
private final String replacement;
public PatternReplaceCharFilterFactory(IndexSettings indexSettings, Environment env, String name, Settings settings) {
super(indexSettings, name);
String sPattern = settings.get("pattern");
if (!Strings.hasLength(sPattern)) {
throw new IllegalArgumentException("pattern is missing for [" + name + "] char filter of type 'pattern_replace'");
}
pattern = Regex.compile(sPattern, settings.get("flags"));
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);
}
@Override
public Object getMultiTermComponent() {
return this;
}
}