org.elasticsearch.search.suggest.phrase.MultiCandidateGeneratorWrapper Maven / Gradle / Ivy
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Elasticsearch subproject :server
/*
* 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.phrase;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.search.suggest.phrase.DirectCandidateGenerator.Candidate;
import org.elasticsearch.search.suggest.phrase.DirectCandidateGenerator.CandidateSet;
import java.io.IOException;
import java.util.Arrays;
import java.util.Comparator;
//TODO public for tests
public final class MultiCandidateGeneratorWrapper extends CandidateGenerator {
private final CandidateGenerator[] candidateGenerator;
private int numCandidates ;
public MultiCandidateGeneratorWrapper(int numCandidates, CandidateGenerator...candidateGenerators) {
this.candidateGenerator = candidateGenerators;
this.numCandidates = numCandidates;
}
@Override
public boolean isKnownWord(BytesRef term) throws IOException {
return candidateGenerator[0].isKnownWord(term);
}
@Override
public long frequency(BytesRef term) throws IOException {
return candidateGenerator[0].frequency(term);
}
@Override
public CandidateSet drawCandidates(CandidateSet set) throws IOException {
for (CandidateGenerator generator : candidateGenerator) {
generator.drawCandidates(set);
}
return reduce(set, numCandidates);
}
private CandidateSet reduce(CandidateSet set, int numCandidates) {
if (set.candidates.length > numCandidates) {
Candidate[] candidates = set.candidates;
Arrays.sort(candidates, (left, right) -> Double.compare(right.score, left.score));
Candidate[] newSet = new Candidate[numCandidates];
System.arraycopy(candidates, 0, newSet, 0, numCandidates);
set.candidates = newSet;
}
return set;
}
@Override
public Candidate createCandidate(BytesRef term, long frequency, double channelScore, boolean userInput) throws IOException {
return candidateGenerator[0].createCandidate(term, frequency, channelScore, userInput);
}
}