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Access to the Neo4j graph database through 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.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.neo4j.driver.internal;

import java.util.Collections;
import java.util.Map;

import org.neo4j.driver.internal.value.RelationshipValue;
import org.neo4j.driver.v1.Identity;
import org.neo4j.driver.v1.Relationship;
import org.neo4j.driver.v1.Value;

/**
 * {@link Relationship} implementation that directly contains type and properties
 * along with {@link Identity} values for start and end nodes.
 */
public class InternalRelationship extends InternalEntity implements Relationship
{
    private Identity start;
    private Identity end;
    private final String type;

    public InternalRelationship( long id, long start, long end, String type )
    {
        this( Identities.identity( id ), Identities.identity( start ),
                Identities.identity( end ), type,
                Collections.emptyMap() );
    }

    public InternalRelationship( long id, long start, long end, String type,
                                 Map properties )
    {
        this( Identities.identity( id ), Identities.identity( start ),
                Identities.identity( end ), type, properties );
    }

    public InternalRelationship( Identity id, Identity start, Identity end, String type,
                                 Map properties )
    {
        super( id, properties );
        this.start = start;
        this.end = end;
        this.type = type;
    }

    @Override
    public boolean hasType( String relationshipType )
    {
        return type().equals( relationshipType );
    }

    /** Modify the start/end identities of this relationship */
    public void setStartAndEnd( Identity start, Identity end )
    {
        this.start = start;
        this.end = end;
    }

    @Override
    public Identity start()
    {
        return start;
    }

    @Override
    public Identity end()
    {
        return end;
    }

    @Override
    public String type()
    {
        return type;
    }

    @Override
    public Value asValue()
    {
        return new RelationshipValue( this );
    }

    @Override
    public String toString()
    {
        return String.format( "relationship<%s>", identity() );
    }
}