org.apache.lucene.queries.spans.SpanWithinQuery Maven / Gradle / Ivy
/*
* 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 java.io.IOException;
import java.util.ArrayList;
import java.util.Map;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermStates;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreMode;
/** Keep matches that are contained within another Spans. */
public final class SpanWithinQuery extends SpanContainQuery {
/**
* Construct a SpanWithinQuery matching spans from little that are inside of
* big. This query has the boost of little. big and little
* must be in the same field.
*/
public SpanWithinQuery(SpanQuery big, SpanQuery little) {
super(big, little);
}
@Override
public String toString(String field) {
return toString(field, "SpanWithin");
}
@Override
public SpanWeight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost)
throws IOException {
SpanWeight bigWeight = big.createWeight(searcher, scoreMode, boost);
SpanWeight littleWeight = little.createWeight(searcher, scoreMode, boost);
return new SpanWithinWeight(
searcher,
scoreMode.needsScores() ? getTermStates(bigWeight, littleWeight) : null,
bigWeight,
littleWeight,
boost);
}
/**
* Creates SpanWithinQuery scorer instances
*
* @lucene.internal
*/
public class SpanWithinWeight extends SpanContainWeight {
public SpanWithinWeight(
IndexSearcher searcher,
Map terms,
SpanWeight bigWeight,
SpanWeight littleWeight,
float boost)
throws IOException {
super(searcher, terms, bigWeight, littleWeight, boost);
}
/**
* Return spans from little that are contained in a spans from big.
* The payload is from the spans of little.
*/
@Override
public Spans getSpans(final LeafReaderContext context, Postings requiredPostings)
throws IOException {
ArrayList containerContained = prepareConjunction(context, requiredPostings);
if (containerContained == null) {
return null;
}
Spans big = containerContained.get(0);
Spans little = containerContained.get(1);
return new ContainSpans(big, little, little) {
@Override
boolean twoPhaseCurrentDocMatches() throws IOException {
oneExhaustedInCurrentDoc = false;
assert littleSpans.startPosition() == -1;
while (littleSpans.nextStartPosition() != NO_MORE_POSITIONS) {
while (bigSpans.endPosition() < littleSpans.endPosition()) {
if (bigSpans.nextStartPosition() == NO_MORE_POSITIONS) {
oneExhaustedInCurrentDoc = true;
return false;
}
}
if (bigSpans.startPosition() <= littleSpans.startPosition()) {
atFirstInCurrentDoc = true;
return true;
}
}
oneExhaustedInCurrentDoc = true;
return false;
}
@Override
public int nextStartPosition() throws IOException {
if (atFirstInCurrentDoc) {
atFirstInCurrentDoc = false;
return littleSpans.startPosition();
}
while (littleSpans.nextStartPosition() != NO_MORE_POSITIONS) {
while (bigSpans.endPosition() < littleSpans.endPosition()) {
if (bigSpans.nextStartPosition() == NO_MORE_POSITIONS) {
oneExhaustedInCurrentDoc = true;
return NO_MORE_POSITIONS;
}
}
if (bigSpans.startPosition() <= littleSpans.startPosition()) {
return littleSpans.startPosition();
}
}
oneExhaustedInCurrentDoc = true;
return NO_MORE_POSITIONS;
}
};
}
@Override
public boolean isCacheable(LeafReaderContext ctx) {
return littleWeight.isCacheable(ctx) && bigWeight.isCacheable(ctx);
}
}
}