org.apache.lucene.queries.spans.SpanDisiWrapper Maven / Gradle / Ivy
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* 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.queries.spans;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.TwoPhaseIterator;
/**
* Wrapper used in {@link SpanDisiPriorityQueue}.
*
* @lucene.internal
*/
public class SpanDisiWrapper {
public final DocIdSetIterator iterator;
public final long cost;
public final float matchCost; // the match cost for two-phase iterators, 0 otherwise
public int doc; // the current doc, used for comparison
public SpanDisiWrapper next; // reference to a next element, see #topList
// An approximation of the iterator, or the iterator itself if it does not
// support two-phase iteration
public final DocIdSetIterator approximation;
// A two-phase view of the iterator, or null if the iterator does not support
// two-phase iteration
public final TwoPhaseIterator twoPhaseView;
public final Spans spans;
public int lastApproxMatchDoc; // last doc of approximation that did match
public int lastApproxNonMatchDoc; // last doc of approximation that did not match
public SpanDisiWrapper(Spans spans) {
this.spans = spans;
this.iterator = spans;
this.cost = iterator.cost();
this.doc = -1;
this.twoPhaseView = spans.asTwoPhaseIterator();
if (twoPhaseView != null) {
approximation = twoPhaseView.approximation();
matchCost = twoPhaseView.matchCost();
} else {
approximation = iterator;
matchCost = 0f;
}
this.lastApproxNonMatchDoc = -2;
this.lastApproxMatchDoc = -2;
}
}