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InputRelationshipCacheReader.java
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InputRelationshipCacheReader.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.unsafe.impl.batchimport.input;
import java.io.IOException;
import org.neo4j.io.fs.StoreChannel;
import static org.neo4j.unsafe.impl.batchimport.input.InputCache.HAS_TYPE_ID;
import static org.neo4j.unsafe.impl.batchimport.input.InputCache.NEW_TYPE;
import static org.neo4j.unsafe.impl.batchimport.input.InputCache.RELATIONSHIP_TYPE_TOKEN;
import static org.neo4j.unsafe.impl.batchimport.input.InputCache.SAME_TYPE;
/**
* Reads cached input relationships previously stored using {@link InputRelationshipCacheWriter}.
*/
public class InputRelationshipCacheReader extends InputEntityCacheReader
{
public InputRelationshipCacheReader( StoreChannel channel, StoreChannel header, Runnable closeAction ) throws IOException
{
super( channel, header, closeAction );
}
@Override
public InputChunk newChunk()
{
return new InputRelationshipDeserializer();
}
class InputRelationshipDeserializer extends InputEntityDeserializer
{
protected String previousType;
@Override
public boolean next( InputEntityVisitor visitor ) throws IOException
{
if ( !readProperties( visitor ) )
{
return false;
}
// groups
Group startNodeGroup = readGroup( 0 );
Group endNodeGroup = readGroup( 1 );
// ids
Object startNodeId = readValue();
Object endNodeId = readValue();
visitor.startId( startNodeId, startNodeGroup );
visitor.endId( endNodeId, endNodeGroup );
// type
byte typeMode = channel.get();
switch ( typeMode )
{
case SAME_TYPE:
visitor.type( previousType );
break;
case NEW_TYPE:
visitor.type( previousType = (String) readToken( RELATIONSHIP_TYPE_TOKEN ) );
break;
case HAS_TYPE_ID:
visitor.type( channel.getInt() );
break;
default:
throw new IllegalArgumentException( "Unrecognized type mode " + typeMode );
}
return true;
}
}
}