| /* |
| * 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.search.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 <code>little</code> |
| * that are inside of <code>big</code>. |
| * This query has the boost of <code>little</code>. |
| * <code>big</code> and <code>little</code> 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); |
| } |
| |
| public class SpanWithinWeight extends SpanContainWeight { |
| |
| public SpanWithinWeight(IndexSearcher searcher, Map<Term, TermStates> terms, |
| SpanWeight bigWeight, SpanWeight littleWeight, float boost) throws IOException { |
| super(searcher, terms, bigWeight, littleWeight, boost); |
| } |
| |
| /** |
| * Return spans from <code>little</code> that are contained in a spans from <code>big</code>. |
| * The payload is from the spans of <code>little</code>. |
| */ |
| @Override |
| public Spans getSpans(final LeafReaderContext context, Postings requiredPostings) throws IOException { |
| ArrayList<Spans> 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); |
| } |
| |
| } |
| |
| } |