/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.apache.lucene.analysis;
import org.apache.lucene.util.Version;
import org.elasticsearch.ElasticsearchIllegalArgumentException;
import org.elasticsearch.common.inject.Injector;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.ESLoggerFactory;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.analysis.AnalysisService;
import org.elasticsearch.index.analysis.NamedAnalyzer;
import java.io.Reader;
import java.util.ArrayList;
/**
* ElasticSearch ComboAnalyzerWrapper wrapper over Lucene ComboAnalyzerWrapper.
*/
public final class ComboAnalyzerWrapper extends Analyzer {
public static final String NAME = "combo";
private final ESLogger logger;
private final Injector injector;
private final Settings settings;
private final Version version;
private final String name;
private org.apache.lucene.analysis.ComboAnalyzer analyzer;
public ComboAnalyzerWrapper(Version version, String name, Settings settings, Injector injector) {
logger = ESLoggerFactory.getLogger(NAME+">"+name);
this.name = name;
// Store parameters for lazy usage
// See ComboAnalyzerProvider comments to learn why
this.injector = injector;
this.settings = settings;
this.version = version;
this.analyzer = null; // must be lazy initialized to get free of the cyclic dependency on AnalysisService
}
/**
* Read settings and load the appropriate sub-analyzers.
*/
synchronized
protected void init() {
if (analyzer != null) return;
AnalysisService analysisService = injector.getInstance(AnalysisService.class);
String[] sub = settings.getAsArray("sub_analyzers");
ArrayList<Analyzer> subAnalyzers = new ArrayList<Analyzer>();
if (sub == null) {
throw new ElasticsearchIllegalArgumentException("Analyzer ["+name+"] analyzer of type ["+NAME+"], must have a \"sub_analyzers\" list property");
}
for (String subname : sub) {
NamedAnalyzer analyzer = analysisService.analyzer(subname);
if (analyzer == null) {
logger.debug("Sub-analyzer \""+subname+"\" not found!");
} else {
subAnalyzers.add(analyzer);
}
}
this.analyzer = new org.apache.lucene.analysis.ComboAnalyzer(version, subAnalyzers.toArray(new Analyzer[subAnalyzers.size()]));
Boolean tokenstreamCaching = settings.getAsBoolean("tokenstream_caching", null);
if (tokenstreamCaching != null)
this.analyzer.setTokenStreamCachingEnabled(tokenstreamCaching);
Boolean deduplication = settings.getAsBoolean("deduplication", null);
if (deduplication != null)
this.analyzer.setDeduplicationEnabled(deduplication);
}
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
if (analyzer == null) init();
return this.analyzer.createComponents(fieldName, reader);
}
@Override public void close() {
if (analyzer != null) this.analyzer.close();
super.close();
}
}