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Utility component to generate Graphviz .dot notation from Neo4j graphs.

There is a newer version: 3.2.0-alpha05

/*
 * 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 .
 */
package org.neo4j.visualization.graphviz;

import java.io.IOException;
import java.util.Iterator;

import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.visualization.PropertyType;

class DefaultNodeStyle implements NodeStyle
{
    protected final DefaultStyleConfiguration config;

    DefaultNodeStyle( DefaultStyleConfiguration configuration )
    {
        this.config = configuration;
    }

    @Override
    public void emitNodeStart( Appendable stream, Node node )
            throws IOException
    {
        stream.append( "  N" + node.getId() + " [\n" );
        config.emit( node, stream );
        stream.append( "    label = \"{"
                       + config.escapeLabel( config.getTitle( node ) ) );
        Iterator labels = node.getLabels().iterator();
        if ( labels.hasNext() )
        {
            if ( labels.hasNext() )
            {
                stream.append( ": " );
                while ( labels.hasNext() )
                {
                    stream.append( labels.next()
                            .name() );
                    if ( labels.hasNext() )
                    {
                        stream.append( ", " );
                    }
                }
            }
        }
        stream.append( "|" );
    }

    @Override
    public void emitEnd( Appendable stream ) throws IOException
    {
        stream.append( "}\"\n  ]\n" );
    }

    @Override
    public void emitProperty( Appendable stream, String key, Object value )
            throws IOException
    {
        if ( config.acceptNodeProperty( key ) )
        {
            PropertyType type = PropertyType.getTypeOf( value );
            config.emitNodeProperty( stream, key, type, value );
        }
    }
}