| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.search.suggest.document; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.search.BulkScorer; |
| import org.apache.lucene.search.CollectionTerminatedException; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.Weight; |
| |
| /** |
| * Adds document suggest capabilities to IndexSearcher. |
| * Any {@link CompletionQuery} can be used to suggest documents. |
| * |
| * Use {@link PrefixCompletionQuery} for analyzed prefix queries, |
| * {@link RegexCompletionQuery} for regular expression prefix queries, |
| * {@link FuzzyCompletionQuery} for analyzed prefix with typo tolerance |
| * and {@link ContextQuery} to boost and/or filter suggestions by contexts |
| * |
| * @lucene.experimental |
| */ |
| public class SuggestIndexSearcher extends IndexSearcher { |
| |
| // NOTE: we do not accept an ExecutorService here, because at least the dedup |
| // logic in TopSuggestDocsCollector/NRTSuggester would not be thread safe (and maybe other things) |
| |
| /** |
| * Creates a searcher with document suggest capabilities |
| * for <code>reader</code>. |
| */ |
| public SuggestIndexSearcher(IndexReader reader) { |
| super(reader); |
| } |
| |
| /** |
| * Returns top <code>n</code> completion hits for |
| * <code>query</code> |
| */ |
| public TopSuggestDocs suggest(CompletionQuery query, int n, boolean skipDuplicates) throws IOException { |
| TopSuggestDocsCollector collector = new TopSuggestDocsCollector(n, skipDuplicates); |
| suggest(query, collector); |
| return collector.get(); |
| } |
| |
| /** |
| * Lower-level suggest API. |
| * Collects completion hits through <code>collector</code> for <code>query</code>. |
| * |
| * <p>{@link TopSuggestDocsCollector#collect(int, CharSequence, CharSequence, float)} |
| * is called for every matching completion hit. |
| */ |
| public void suggest(CompletionQuery query, TopSuggestDocsCollector collector) throws IOException { |
| // TODO use IndexSearcher.rewrite instead |
| // have to implement equals() and hashCode() in CompletionQuerys and co |
| query = (CompletionQuery) query.rewrite(getIndexReader()); |
| Weight weight = query.createWeight(this, collector.scoreMode(), 1f); |
| for (LeafReaderContext context : getIndexReader().leaves()) { |
| BulkScorer scorer = weight.bulkScorer(context); |
| if (scorer != null) { |
| try { |
| scorer.score(collector.getLeafCollector(context), context.reader().getLiveDocs()); |
| } catch (CollectionTerminatedException e) { |
| // collection was terminated prematurely |
| // continue with the following leaf |
| } |
| } |
| } |
| } |
| } |