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IndexLookup.java
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IndexLookup.java
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/*
* Copyright (c) 2002-2016 "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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.storemigration.legacystore.v21.propertydeduplication;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.neo4j.collection.primitive.Primitive;
import org.neo4j.collection.primitive.PrimitiveIntObjectMap;
import org.neo4j.kernel.api.index.IndexAccessor;
import org.neo4j.kernel.api.index.IndexConfiguration;
import org.neo4j.kernel.api.index.SchemaIndexProvider;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.api.index.sampling.IndexSamplingConfig;
import org.neo4j.kernel.impl.store.SchemaStore;
import org.neo4j.kernel.impl.store.record.IndexRule;
import org.neo4j.storageengine.api.schema.IndexReader;
import org.neo4j.storageengine.api.schema.SchemaRule;
class IndexLookup implements AutoCloseable
{
private final List<IndexAccessor> indexAccessors;
private final Map<IndexRule,IndexReader> readerCache;
private final SchemaIndexProvider schemaIndexProvider;
private final PrimitiveIntObjectMap<List<IndexRule>> indexRuleIndex;
private final IndexSamplingConfig samplingConfig;
public IndexLookup( SchemaStore store, SchemaIndexProvider schemaIndexProvider )
{
this.schemaIndexProvider = schemaIndexProvider;
indexAccessors = new ArrayList<>();
readerCache = new HashMap<>();
indexRuleIndex = buildIndexRuleIndex( store );
samplingConfig = new IndexSamplingConfig( new Config() );
}
private PrimitiveIntObjectMap<List<IndexRule>> buildIndexRuleIndex( SchemaStore schemaStore )
{
final PrimitiveIntObjectMap<List<IndexRule>> indexRuleIndex = Primitive.intObjectMap();
for ( SchemaRule schemaRule : schemaStore )
{
if ( schemaRule.getKind() == SchemaRule.Kind.INDEX_RULE )
{
IndexRule rule = (IndexRule) schemaRule;
List<IndexRule> ruleList = indexRuleIndex.get( rule.getPropertyKey() );
if ( ruleList == null )
{
ruleList = new LinkedList<>();
indexRuleIndex.put( rule.getPropertyKey(), ruleList );
}
ruleList.add( rule );
}
}
return indexRuleIndex;
}
@Override
public void close() throws IOException
{
for ( IndexReader indexReader : readerCache.values() )
{
indexReader.close();
}
for ( IndexAccessor indexAccessor : indexAccessors )
{
indexAccessor.close();
}
}
private IndexRule findRelevantIndexRule( List<IndexRule> indexRules, int propertyKeyId, long[] labelIds )
{
for ( long labelId : labelIds )
{
for ( IndexRule indexRule : indexRules )
{
if ( indexRule.getPropertyKey() == propertyKeyId && indexRule.getLabel() == labelId )
{
return indexRule;
}
}
}
return null;
}
private IndexReader getIndexReader( IndexRule rule ) throws IOException
{
IndexReader reader = readerCache.get( rule );
if ( reader == null )
{
IndexConfiguration indexConfig = IndexConfiguration.of( rule );
IndexAccessor accessor = schemaIndexProvider.getOnlineAccessor(
rule.getId(), indexConfig, samplingConfig );
indexAccessors.add( accessor );
reader = accessor.newReader();
readerCache.put( rule, reader );
}
return reader;
}
public Index getAnyIndexOrNull( final long[] labelIds, final int propertyKeyId ) throws IOException {
List<IndexRule> indexRules = indexRuleIndex.get( propertyKeyId );
if( indexRules == null )
{
return null;
}
IndexRule rule = findRelevantIndexRule( indexRules, propertyKeyId, labelIds );
if (rule == null)
{
return null;
}
final IndexReader reader = getIndexReader( rule );
return new Index()
{
@Override
public boolean contains( long nodeId, Object propertyValue )
{
return reader.countIndexedNodes( nodeId, propertyValue ) > 0;
}
};
}
public boolean hasAnyIndexes()
{
return !indexRuleIndex.isEmpty();
}
static interface Index
{
boolean contains( long nodeId, Object propertyValue ) throws IOException;
}
}