org.elasticsearch.search.suggest.completion.TopSuggestGroupDocsCollector Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.suggest.completion;
import org.apache.lucene.search.suggest.document.TopSuggestDocsCollector;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
*
* Extension of the {@link TopSuggestDocsCollector} that returns top documents from the completion suggester.
*
* This collector groups suggestions coming from the same document but matching different contexts
* or surface form together. When different contexts or surface forms match the same suggestion form only
* the best one per document (sorted by weight) is kept.
**/
class TopSuggestGroupDocsCollector extends TopSuggestDocsCollector {
private Map> docContexts = new HashMap<>();
/**
* Sole constructor
*
* Collects at most num
completions
* with corresponding document and weight
*/
TopSuggestGroupDocsCollector(int num, boolean skipDuplicates) {
super(num, skipDuplicates);
}
/**
* Returns the contexts associated with the provided doc
.
*/
List getContexts(int doc) {
return docContexts.getOrDefault(doc, Collections.emptyList());
}
@Override
public void collect(int docID, CharSequence key, CharSequence context, float score) throws IOException {
int globalDoc = docID + docBase;
boolean isNewDoc = docContexts.containsKey(globalDoc) == false;
List contexts = docContexts.computeIfAbsent(globalDoc, k -> new ArrayList<>());
if (context != null) {
contexts.add(context);
}
if (isNewDoc) {
super.collect(docID, key, context, score);
}
}
}