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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.search.suggest;
import org.apache.lucene.util.CharsRefBuilder;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.search.SearchPhase;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.suggest.Suggest.Suggestion;
import org.elasticsearch.search.suggest.Suggest.Suggestion.Entry;
import org.elasticsearch.search.suggest.Suggest.Suggestion.Entry.Option;
import org.elasticsearch.search.suggest.SuggestionSearchContext.SuggestionContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Suggest phase of a search request, used to collect suggestions
*/
public class SuggestPhase extends AbstractComponent implements SearchPhase {
public SuggestPhase(Settings settings) {
super(settings);
}
@Override
public void preProcess(SearchContext context) {
}
@Override
public void execute(SearchContext context) {
final SuggestionSearchContext suggest = context.suggest();
if (suggest == null) {
return;
}
try {
CharsRefBuilder spare = new CharsRefBuilder();
final List<Suggestion<? extends Entry<? extends Option>>> suggestions = new ArrayList<>(suggest.suggestions().size());
for (Map.Entry<String, SuggestionSearchContext.SuggestionContext> entry : suggest.suggestions().entrySet()) {
SuggestionSearchContext.SuggestionContext suggestion = entry.getValue();
Suggester<SuggestionContext> suggester = suggestion.getSuggester();
Suggestion<? extends Entry<? extends Option>> result =
suggester.execute(entry.getKey(), suggestion, context.searcher(), spare);
if (result != null) {
assert entry.getKey().equals(result.name);
suggestions.add(result);
}
}
context.queryResult().suggest(new Suggest(suggestions));
} catch (IOException e) {
throw new ElasticsearchException("I/O exception during suggest phase", e);
}
}
}
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