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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.apache.lucene.queries;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.ConstantScoreScorer;
import org.apache.lucene.search.ConstantScoreWeight;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.FieldComparator;
import org.apache.lucene.search.FieldDoc;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.LeafFieldComparator;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreMode;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.Weight;
import org.elasticsearch.common.lucene.Lucene;
import java.io.IOException;
import java.util.Arrays;
import java.util.Objects;
/**
* A {@link Query} that only matches documents that are greater than the provided {@link FieldDoc}.
* This works only if the index is sorted according to the given search {@link Sort}.
*/
public class SearchAfterSortedDocQuery extends Query {
private final Sort sort;
private final FieldDoc after;
private final FieldComparator[] fieldComparators;
private final int[] reverseMuls;
public SearchAfterSortedDocQuery(Sort sort, FieldDoc after) {
if (sort.getSort().length != after.fields.length) {
throw new IllegalArgumentException("after doc has " + after.fields.length + " value(s) but sort has "
+ sort.getSort().length + ".");
}
this.sort = Objects.requireNonNull(sort);
this.after = after;
int numFields = sort.getSort().length;
this.fieldComparators = new FieldComparator[numFields];
this.reverseMuls = new int[numFields];
for (int i = 0; i < numFields; i++) {
SortField sortField = sort.getSort()[i];
FieldComparator fieldComparator = sortField.getComparator(1, i);
@SuppressWarnings("unchecked")
FieldComparator