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139
.../fulltext-addon/src/main/java/org/neo4j/kernel/api/impl/fulltext/ScoreEntityIterator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| /* | ||
| * Copyright (c) 2002-2018 "Neo Technology," | ||
| * Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
| * | ||
| * This file is part of Neo4j. | ||
| * | ||
| * Neo4j is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as | ||
| * published by the Free Software Foundation, either version 3 of the | ||
| * License, or (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.kernel.api.impl.fulltext; | ||
|
|
||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.NoSuchElementException; | ||
| import java.util.Spliterator; | ||
| import java.util.Spliterators; | ||
| import java.util.stream.Stream; | ||
| import java.util.stream.StreamSupport; | ||
|
|
||
| import org.neo4j.helpers.collection.Pair; | ||
| import org.neo4j.kernel.api.impl.index.collector.ValuesIterator; | ||
|
|
||
| public class ScoreEntityIterator implements Iterator<Pair<Long,Float>> | ||
| { | ||
| private static final ScoreEntityIterator EMPTY = new ScoreEntityIterator() | ||
| { | ||
| @Override | ||
| public Stream<Pair<Long,Float>> stream() | ||
| { | ||
| return Stream.empty(); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean hasNext() | ||
| { | ||
| return false; | ||
| } | ||
|
|
||
| @Override | ||
| public Pair<Long,Float> next() | ||
| { | ||
| throw new NoSuchElementException( "The iterator is exhausted" ); | ||
| } | ||
| }; | ||
| private final ValuesIterator iterator; | ||
|
|
||
| ScoreEntityIterator( ValuesIterator sortedValuesIterator ) | ||
| { | ||
| this.iterator = sortedValuesIterator; | ||
| } | ||
|
|
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| private ScoreEntityIterator() | ||
| { | ||
| this.iterator = null; | ||
| } | ||
|
|
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| public Stream<Pair<Long,Float>> stream() | ||
| { | ||
| return StreamSupport.stream( Spliterators.spliteratorUnknownSize( this, Spliterator.ORDERED ), false ); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean hasNext() | ||
| { | ||
| return iterator.hasNext(); | ||
| } | ||
|
|
||
| @Override | ||
| public Pair<Long,Float> next() | ||
| { | ||
| if ( hasNext() ) | ||
| { | ||
| return Pair.of( currentIterator().next(), currentIterator().currentScore() ); | ||
| } | ||
| else | ||
| { | ||
| throw new NoSuchElementException( "The iterator is exhausted" ); | ||
| } | ||
| } | ||
|
|
||
| ValuesIterator currentIterator() | ||
| { | ||
| return iterator; | ||
| } | ||
|
|
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| public static ScoreEntityIterator concat( List<ScoreEntityIterator> iterators ) | ||
| { | ||
| return new ConcatenatingScoreEntityIterator( iterators.iterator() ); | ||
| } | ||
|
|
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| public static ScoreEntityIterator emptyIterator() | ||
| { | ||
| return EMPTY; | ||
| } | ||
|
|
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| private static class ConcatenatingScoreEntityIterator extends ScoreEntityIterator | ||
| { | ||
| private final Iterator<? extends ScoreEntityIterator> iterators; | ||
| private ScoreEntityIterator currentIterator; | ||
|
|
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| ConcatenatingScoreEntityIterator( Iterator<? extends ScoreEntityIterator> iterators ) | ||
| { | ||
| this.iterators = iterators; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean hasNext() | ||
| { | ||
| if ( currentIterator == null || !currentIterator.hasNext() ) | ||
| { | ||
| while ( iterators.hasNext() ) | ||
| { | ||
| currentIterator = iterators.next(); | ||
| if ( currentIterator.hasNext() ) | ||
| { | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| return currentIterator != null && currentIterator.hasNext(); | ||
| } | ||
|
|
||
| @Override | ||
| final ValuesIterator currentIterator() | ||
| { | ||
| return currentIterator.iterator; | ||
| } | ||
| } | ||
| } |
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