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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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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 .
 */
package org.neo4j.kernel.api.constraints;

import org.neo4j.kernel.api.TokenNameLookup;
import org.neo4j.kernel.api.exceptions.schema.CreateConstraintFailureException;

/**
 * Description of constraint enforcing relationships to contain a certain property.
 */
public class RelationshipPropertyExistenceConstraint extends RelationshipPropertyConstraint
{
    public RelationshipPropertyExistenceConstraint( int relTypeId, int propertyKeyId )
    {
        super( relTypeId, propertyKeyId );
    }

    @Override
    public void added( ChangeVisitor visitor ) throws CreateConstraintFailureException
    {
        visitor.visitAddedRelationshipPropertyExistenceConstraint( this );
    }

    @Override
    public void removed( ChangeVisitor visitor )
    {
        visitor.visitRemovedRelationshipPropertyExistenceConstraint( this );
    }

    @Override
    public String userDescription( TokenNameLookup tokenNameLookup )
    {
        String typeName = tokenNameLookup.relationshipTypeGetName( relationshipTypeId );
        String boundIdentifier = typeName.toLowerCase();
        return String.format( "CONSTRAINT ON ()-[ %s:%s ]-() ASSERT exists(%s.%s)",
                boundIdentifier, typeName, boundIdentifier, tokenNameLookup.propertyKeyGetName( propertyKeyId ) );
    }

    @Override
    public String toString()
    {
        return String.format( "CONSTRAINT ON ()-[ n:relationshipType[%s] ]-() ASSERT exists(n.property[%s])",
                relationshipTypeId, propertyKeyId );
    }
}