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SimpleDataGenerator.java
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SimpleDataGenerator.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.tooling;
import java.util.function.Function;
import org.neo4j.csv.reader.SourceTraceability;
import org.neo4j.unsafe.impl.batchimport.IdRangeInput.Range;
import org.neo4j.unsafe.impl.batchimport.input.Groups;
import org.neo4j.unsafe.impl.batchimport.input.InputNode;
import org.neo4j.unsafe.impl.batchimport.input.InputRelationship;
import org.neo4j.unsafe.impl.batchimport.input.csv.Header;
import org.neo4j.unsafe.impl.batchimport.input.csv.IdType;
import org.neo4j.unsafe.impl.batchimport.input.csv.InputNodeDeserialization;
import org.neo4j.unsafe.impl.batchimport.input.csv.InputRelationshipDeserialization;
public class SimpleDataGenerator extends SourceTraceability.Adapter
{
private final Header nodeHeader;
private final Header relationshipHeader;
private final long randomSeed;
private final long nodeCount;
private final Distribution<String> labels;
private final Distribution<String> relationshipTypes;
private final Groups groups = new Groups();
private final IdType idType;
private final String className = getClass().getSimpleName();
public SimpleDataGenerator( Header nodeHeader, Header relationshipHeader, long randomSeed,
long nodeCount, int labelCount, int relationshipTypeCount, IdType idType )
{
this.nodeHeader = nodeHeader;
this.relationshipHeader = relationshipHeader;
this.randomSeed = randomSeed;
this.nodeCount = nodeCount;
this.idType = idType;
this.labels = new Distribution<>( tokens( "Label", labelCount ) );
this.relationshipTypes = new Distribution<>( tokens( "TYPE", relationshipTypeCount ) );
}
public Function<Range,InputNode[]> nodes()
{
return batch -> new SimpleDataGeneratorBatch<>( nodeHeader, batch.getStart(), randomSeed + batch.getStart(),
nodeCount, labels, relationshipTypes,
new InputNodeDeserialization( nodeHeader, SimpleDataGenerator.this, groups, idType.idsAreExternal() ),
new InputNode[batch.getSize()] ).get();
}
public Function<Range,InputRelationship[]> relationships()
{
return batch -> new SimpleDataGeneratorBatch<>( relationshipHeader, batch.getStart(),
randomSeed + batch.getStart(), nodeCount, labels, relationshipTypes,
new InputRelationshipDeserialization( relationshipHeader, SimpleDataGenerator.this, groups ),
new InputRelationship[batch.getSize()] ).get();
}
private static String[] tokens( String prefix, int count )
{
String[] result = new String[count];
for ( int i = 0; i < count; i++ )
{
result[i] = prefix + (i+1);
}
return result;
}
@Override
public String sourceDescription()
{
return className;
}
}