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TestGraphvizSubgraphOutput.java
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TestGraphvizSubgraphOutput.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.visualization.graphviz;
import org.junit.Rule;
import org.junit.Test;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.Transaction;
import org.neo4j.test.rule.DatabaseRule;
import org.neo4j.test.rule.ImpermanentDatabaseRule;
import org.neo4j.visualization.SubgraphMapper;
import static java.util.Arrays.asList;
public class TestGraphvizSubgraphOutput
{
enum type implements RelationshipType
{
KNOWS, WORKS_FOR
}
@Rule
public final DatabaseRule dbRule = new ImpermanentDatabaseRule();
@Test
public void testSimpleGraph() throws Exception
{
GraphDatabaseService neo = dbRule.getGraphDatabaseAPI();
try ( Transaction tx = neo.beginTx() )
{
final Node emil = neo.createNode();
emil.setProperty( "name", "Emil Eifrém" );
emil.setProperty( "country_of_residence", "USA" );
final Node tobias = neo.createNode();
tobias.setProperty( "name", "Tobias Ivarsson" );
tobias.setProperty( "country_of_residence", "Sweden" );
final Node johan = neo.createNode();
johan.setProperty( "name", "Johan Svensson" );
johan.setProperty( "country_of_residence", "Sweden" );
final Relationship emilKNOWStobias = emil.createRelationshipTo( tobias, type.KNOWS );
final Relationship johanKNOWSemil = johan.createRelationshipTo( emil, type.KNOWS );
final Relationship tobiasKNOWSjohan = tobias.createRelationshipTo( johan, type.KNOWS );
final Relationship tobiasWORKS_FORemil = tobias.createRelationshipTo( emil, type.WORKS_FOR );
OutputStream out = new ByteArrayOutputStream();
SubgraphMapper subgraphMapper = new SubgraphMapper()
{
@Override
public String getSubgraphFor( Node node )
{
if ( node.hasProperty( "country_of_residence" ) )
{
return (String) node.getProperty( "country_of_residence" );
}
return null;
}
};
GraphvizWriter writer = new GraphvizWriter();
SubgraphMapper.SubgraphMappingWalker walker = new SubgraphMapper.SubgraphMappingWalker( subgraphMapper )
{
@Override
protected Iterable<Node> nodes()
{
return asList( emil, tobias, johan );
}
@Override
protected Iterable<Relationship> relationships()
{
return asList( emilKNOWStobias, johanKNOWSemil, tobiasKNOWSjohan, tobiasWORKS_FORemil );
}
};
writer.emit( out, walker );
tx.success();
}
}
}