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InputNodeDeserialization.java
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InputNodeDeserialization.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.unsafe.impl.batchimport.input.csv;
import java.util.Arrays;
import org.neo4j.csv.reader.SourceTraceability;
import org.neo4j.unsafe.impl.batchimport.input.Group;
import org.neo4j.unsafe.impl.batchimport.input.Groups;
import org.neo4j.unsafe.impl.batchimport.input.InputEntity;
import org.neo4j.unsafe.impl.batchimport.input.InputNode;
import org.neo4j.unsafe.impl.batchimport.input.csv.Header.Entry;
import static java.util.Arrays.copyOf;
/**
* Builds {@link InputNode} from CSV data.
*/
public class InputNodeDeserialization extends InputEntityDeserialization<InputNode>
{
private final Header header;
private final Groups groups;
private final boolean idsAreExternal;
private Group group;
private Object id;
private String[] labels = new String[10];
private int labelsCursor;
public InputNodeDeserialization( Header header, SourceTraceability source, Groups groups, boolean idsAreExternal )
{
super( source );
this.header = header;
this.groups = groups;
this.idsAreExternal = idsAreExternal;
}
@Override
public void initialize()
{
// ID header entry is optional
Entry idEntry = header.entry( Type.ID );
this.group = groups.getOrCreate( idEntry != null ? idEntry.groupName() : null );
}
@Override
public void handle( Entry entry, Object value )
{
switch ( entry.type() )
{
case ID:
if ( entry.name() != null && idsAreExternal )
{
addProperty( entry.name(), value );
}
id = value;
break;
case LABEL:
addLabels( value );
break;
default:
super.handle( entry, value );
break;
}
}
@Override
public InputNode materialize()
{
return new InputNode(
source.sourceDescription(), source.lineNumber(), source.position(),
group, id, properties(), null, labels(), null );
}
@Override
public void clear()
{
super.clear();
labelsCursor = 0;
id = null;
}
private void ensureLabelsCapacity( int length )
{
if ( length > labels.length )
{
labels = Arrays.copyOf( labels, length );
}
}
private void addLabels( Object value )
{
if ( value instanceof String )
{
ensureLabelsCapacity( labelsCursor + 1 );
labels[labelsCursor++] = (String) value;
}
else if ( value instanceof String[] )
{
String[] labelsToAdd = (String[]) value;
ensureLabelsCapacity( labelsCursor + labelsToAdd.length );
for ( String label : (String[]) value )
{
labels[labelsCursor++] = label;
}
}
else
{
throw new IllegalArgumentException( "Unexpected label value type " +
value.getClass() + ": " + value );
}
}
private String[] labels()
{
return labelsCursor > 0
? copyOf( labels, labelsCursor )
: InputEntity.NO_LABELS;
}
}