org.apache.lucene.queries.intervals.ConjunctionIntervalsSource 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.intervals;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.QueryVisitor;
abstract class ConjunctionIntervalsSource extends IntervalsSource {
protected final List subSources;
protected ConjunctionIntervalsSource(List subSources) {
assert subSources.size() > 1;
this.subSources = subSources;
}
@Override
public void visit(String field, QueryVisitor visitor) {
Query parent = new IntervalQuery(field, this);
QueryVisitor v = visitor.getSubVisitor(BooleanClause.Occur.MUST, parent);
for (IntervalsSource source : subSources) {
source.visit(field, v);
}
}
@Override
public final IntervalIterator intervals(String field, LeafReaderContext ctx) throws IOException {
List subIntervals = new ArrayList<>();
for (IntervalsSource source : subSources) {
IntervalIterator it = source.intervals(field, ctx);
if (it == null) {
return null;
}
subIntervals.add(it);
}
return combine(subIntervals);
}
protected abstract IntervalIterator combine(List iterators);
/**
* Create matches iterator from an advanced and validated interval iterator and a list of matches
* iterator of all the sub-sources
*/
protected IntervalMatchesIterator createMatchesIterator(
IntervalIterator it, List subs) {
return new ConjunctionMatchesIterator(it, subs);
}
@Override
public final IntervalMatchesIterator matches(String field, LeafReaderContext ctx, int doc)
throws IOException {
List subs = new ArrayList<>();
for (IntervalsSource source : subSources) {
IntervalMatchesIterator mi = source.matches(field, ctx, doc);
if (mi == null) {
return null;
}
subs.add(mi);
}
IntervalIterator it =
combine(
subs.stream()
.map(m -> IntervalMatches.wrapMatches(m, doc))
.collect(Collectors.toList()));
if (it.advance(doc) != doc) {
return null;
}
if (it.nextInterval() == IntervalIterator.NO_MORE_INTERVALS) {
return null;
}
return createMatchesIterator(it, subs);
}
}