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StringLayout.java
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StringLayout.java
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/*
* 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 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.index.schema;
import org.neo4j.index.internal.gbptree.Layout;
import org.neo4j.io.pagecache.PageCursor;
import static java.lang.String.format;
import static org.neo4j.kernel.impl.index.schema.StringSchemaKey.ENTITY_ID_SIZE;
/**
* {@link Layout} for numbers where numbers doesn't need to be unique.
*/
abstract class StringLayout extends Layout.Adapter<StringSchemaKey,NativeSchemaValue>
{
@Override
public StringSchemaKey newKey()
{
return new StringSchemaKey();
}
@Override
public StringSchemaKey copyKey( StringSchemaKey key, StringSchemaKey into )
{
// TODO when we have reuse of byte[] take that into consideration here too
into.bytes = key.bytes.clone();
into.setEntityId( key.getEntityId() );
into.setEntityIdIsSpecialTieBreaker( key.getEntityIdIsSpecialTieBreaker() );
return into;
}
@Override
public NativeSchemaValue newValue()
{
return NativeSchemaValue.INSTANCE;
}
@Override
public int keySize( StringSchemaKey key )
{
return key.size();
}
@Override
public int valueSize( NativeSchemaValue value )
{
return NativeSchemaValue.SIZE;
}
@Override
public void writeKey( PageCursor cursor, StringSchemaKey key )
{
cursor.putLong( key.getEntityId() );
cursor.putBytes( key.bytes );
}
@Override
public void writeValue( PageCursor cursor, NativeSchemaValue value )
{
}
@Override
public void readKey( PageCursor cursor, StringSchemaKey into, int keySize )
{
// TODO consider reusing byte[] instances somehow
into.setEntityId( cursor.getLong() );
into.bytes = new byte[keySize - ENTITY_ID_SIZE];
cursor.getBytes( into.bytes );
}
@Override
public void readValue( PageCursor cursor, NativeSchemaValue into, int valueSize )
{
}
@Override
public boolean fixedSize()
{
return false;
}
@Override
public String toString()
{
return format( "%s[version:%d.%d, identifier:%d]", getClass().getSimpleName(), majorVersion(), minorVersion(), identifier() );
}
}