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Neo4j property value system.
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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.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.values.virtual;

import org.neo4j.values.AnyValueWriter;

import static org.neo4j.memory.HeapEstimator.shallowSizeOfInstance;

public class PathReference extends VirtualPathValue
{
    private static final long SHALLOW_SIZE = shallowSizeOfInstance( PathReference.class );

    private final long[] nodes;
    private final long[] relationships;

    PathReference( long[] nodes, long[] relationships )
    {
        this.nodes = nodes;
        this.relationships = relationships;
    }

    @Override
    public long estimatedHeapUsage()
    {
        return SHALLOW_SIZE;
    }

    @Override
    public long startNodeId()
    {
        return nodes[0];
    }

    @Override
    public long endNodeId()
    {
        return nodes[nodes.length - 1];
    }

    @Override
    public long[] nodeIds()
    {
        return nodes;
    }

    @Override
    public long[] relationshipIds()
    {
        return relationships;
    }

    @Override
    public int size()
    {
        return relationships.length;
    }

    @Override
    public  void writeTo( AnyValueWriter writer ) throws E
    {
        writer.writePathReference( nodes, relationships );
    }

    @Override
    public ListValue asList()
    {

        int size = nodes.length + relationships.length;
        ListValueBuilder builder = ListValueBuilder.newListBuilder( size );
        for ( int i = 0; i < size; i++ )
        {
            if ( i % 2 == 0 )
            {
                builder.add( VirtualValues.node( nodes[i / 2] ) );
            }
            else
            {
                builder.add( VirtualValues.relationship( relationships[i / 2] ) );
            }
        }
        return builder.build();
    }

    @Override
    public String toString()
    {
        StringBuilder sb = new StringBuilder( getTypeName() + "{" );
        int i = 0;
        sb.append( "(" ).append( nodes[0] ).append( ")" );
        for ( ; i < relationships.length; i++ )
        {
            sb.append( "-" );
            sb.append( "[" ).append( relationships[i] ).append( "]" );
            sb.append( "-" );
            sb.append( "(" ).append( nodes[i + 1] ).append( ")" );
        }
        sb.append( '}' );
        return sb.toString();
    }
}