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InMemoryIndexImplementation.java
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InMemoryIndexImplementation.java
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/*
* Copyright (c) 2002-2017 "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.api.index.inmemory;
import java.util.Set;
import org.neo4j.collection.primitive.PrimitiveLongIterator;
import org.neo4j.helpers.collection.BoundedIterable;
import org.neo4j.kernel.api.index.ArrayEncoder;
import org.neo4j.storageengine.api.schema.IndexReader;
import org.neo4j.values.storable.Value;
abstract class InMemoryIndexImplementation implements IndexReader, BoundedIterable<Long>
{
abstract void initialize();
abstract void drop();
public final PrimitiveLongIterator seek( Value... values )
{
return doIndexSeek( encode( values ) );
}
final boolean add( long nodeId, boolean applyIdempotently, Value... propertyValues )
{
return doAdd( nodeId, applyIdempotently, encode( propertyValues ) );
}
final void remove( long nodeId, Value... propertyValues )
{
doRemove( nodeId, encode( propertyValues ) );
}
@Override
public final long countIndexedNodes( long nodeId, Value... propertyValues )
{
return doCountIndexedNodes( nodeId, encode( propertyValues ) );
}
protected abstract long doCountIndexedNodes( long nodeId, Object... encode );
abstract PrimitiveLongIterator doIndexSeek( Object... propertyValue );
abstract boolean doAdd( long nodeId, boolean applyIdempotently, Object... propertyValue );
abstract void doRemove( long nodeId, Object... propertyValue );
abstract void remove( long nodeId );
abstract void iterateAll( IndexEntryIterator iterator ) throws Exception;
@Override
public void close()
{
}
private static Object[] encode( Value[] propertyValues )
{
Object[] encoded = new Object[propertyValues.length];
for ( int i = 0; i < propertyValues.length; i++ )
{
encoded[i] = encode( propertyValues[i] );
}
return encoded;
}
private static Object encode( Value value )
{
Object asObject = value.asObject();
if ( asObject instanceof Number )
{
asObject = ((Number) asObject).doubleValue();
}
else if ( asObject instanceof Character )
{
asObject = asObject.toString();
}
else if ( asObject.getClass().isArray() )
{
asObject = new ArrayKey( ArrayEncoder.encode( value ) );
}
return asObject;
}
static class ArrayKey
{
private final String arrayValue;
private ArrayKey( String arrayValue )
{
this.arrayValue = arrayValue;
}
@Override
public boolean equals( Object o )
{
if ( this == o )
{
return true;
}
if ( o == null || getClass() != o.getClass() )
{
return false;
}
ArrayKey other = (ArrayKey) o;
return other.arrayValue.equals( this.arrayValue );
}
@Override
public int hashCode()
{
return arrayValue != null ? arrayValue.hashCode() : 0;
}
}
abstract InMemoryIndexImplementation snapshot();
protected interface IndexEntryIterator
{
void visitEntry( Object key, Set<Long> nodeId ) throws Exception;
}
abstract boolean hasSameContentsAs( InMemoryIndexImplementation other );
}