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CsvGroupInputIterator.java
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CsvGroupInputIterator.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.csv;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.Iterator;
import org.neo4j.csv.reader.CharReadableChunker.ChunkImpl;
import org.neo4j.csv.reader.Extractors;
import org.neo4j.csv.reader.MultiReadable;
import org.neo4j.unsafe.impl.batchimport.InputIterator;
import org.neo4j.unsafe.impl.batchimport.input.Collector;
import org.neo4j.unsafe.impl.batchimport.input.Groups;
import org.neo4j.unsafe.impl.batchimport.input.InputChunk;
/**
* Iterates over groups of input data, each group containing one or more input files. A whole group conforms has each its own header.
*/
public class CsvGroupInputIterator extends InputIterator.Adapter
{
private final Iterator<DataFactory> source;
private final Header.Factory headerFactory;
private final IdType idType;
private final Configuration config;
private final Collector badCollector;
private final Groups groups;
private CsvInputIterator current;
private int groupId;
public CsvGroupInputIterator( Iterator<DataFactory> source, Header.Factory headerFactory,
IdType idType, Configuration config, Collector badCollector, Groups groups )
{
this.source = source;
this.headerFactory = headerFactory;
this.idType = idType;
this.config = config;
this.badCollector = badCollector;
this.groups = groups;
}
@Override
public CsvInputChunkProxy newChunk()
{
return new CsvInputChunkProxy();
}
static Extractors extractors( Configuration config )
{
return new Extractors( config.arrayDelimiter(), config.emptyQuotedStringsAsNull() );
}
@Override
public synchronized boolean next( InputChunk chunk ) throws IOException
{
while ( true )
{
if ( current == null )
{
if ( !source.hasNext() )
{
return false;
}
Data data = source.next().create( config );
current = new CsvInputIterator( new MultiReadable( data.stream() ), data.decorator(),
headerFactory, idType, config, groups, badCollector, extractors( config ), groupId++ );
}
if ( current.next( (CsvInputChunkProxy) chunk ) )
{
return true;
}
current.close();
current = null;
}
}
@Override
public void close()
{
try
{
if ( current != null )
{
current.close();
}
current = null;
}
catch ( IOException e )
{
throw new UncheckedIOException( e );
}
}
}