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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) 2002-2015 "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.txstate;

import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.neo4j.kernel.api.constraints.NodePropertyExistenceConstraint;
import org.neo4j.kernel.api.constraints.RelationshipPropertyExistenceConstraint;
import org.neo4j.kernel.api.constraints.UniquenessConstraint;
import org.neo4j.kernel.api.exceptions.schema.ConstraintValidationKernelException;
import org.neo4j.kernel.api.exceptions.schema.CreateConstraintFailureException;
import org.neo4j.kernel.api.index.IndexDescriptor;
import org.neo4j.kernel.api.procedures.ProcedureDescriptor;
import org.neo4j.kernel.api.properties.DefinedProperty;
import org.neo4j.kernel.impl.api.state.RelationshipChangesForNode;

/**
 * A visitor for visiting the changes that have been made in a transaction.
 */
public interface TxStateVisitor
{
    void visitCreatedNode( long id );

    void visitDeletedNode( long id );

    void visitCreatedRelationship( long id, int type, long startNode, long endNode )
            throws ConstraintValidationKernelException;

    void visitDeletedRelationship( long id );

    void visitNodePropertyChanges( long id, Iterator added, Iterator changed,
                                   Iterator removed ) throws ConstraintValidationKernelException;

    void visitNodeRelationshipChanges( long id, RelationshipChangesForNode added,
                                       RelationshipChangesForNode removed );

    void visitRelPropertyChanges( long id, Iterator added, Iterator changed,
                                  Iterator removed ) throws ConstraintValidationKernelException;

    void visitGraphPropertyChanges( Iterator added, Iterator changed,
                                    Iterator removed );

    void visitNodeLabelChanges( long id, Set added, Set removed )
            throws ConstraintValidationKernelException;

    void visitAddedIndex( IndexDescriptor element, boolean isConstraintIndex );

    void visitRemovedIndex( IndexDescriptor element, boolean isConstraintIndex );

    void visitAddedUniquePropertyConstraint( UniquenessConstraint element );

    void visitRemovedUniquePropertyConstraint( UniquenessConstraint element );

    void visitAddedNodePropertyExistenceConstraint( NodePropertyExistenceConstraint element )
            throws CreateConstraintFailureException;

    void visitRemovedNodePropertyExistenceConstraint( NodePropertyExistenceConstraint element );

    void visitAddedRelationshipPropertyExistenceConstraint( RelationshipPropertyExistenceConstraint element )
            throws CreateConstraintFailureException;

    void visitRemovedRelationshipPropertyExistenceConstraint( RelationshipPropertyExistenceConstraint element );

    void visitCreatedLabelToken( String name, int id );

    void visitCreatedPropertyKeyToken( String name, int id );

    void visitCreatedRelationshipTypeToken( String name, int id );

    void visitCreatedNodeLegacyIndex( String name, Map config );

    void visitCreatedRelationshipLegacyIndex( String name, Map config );

    void visitCreatedProcedure( ProcedureDescriptor procedureDescriptor );

    void visitDroppedProcedure( ProcedureDescriptor procedureDescriptor );

    class Adapter implements TxStateVisitor
    {
        private final TxStateVisitor next;

        public Adapter( TxStateVisitor next )
        {
            this.next = next;
        }

        public Adapter()
        {
            this( null );
        }

        @Override
        public void visitCreatedNode( long id )
        {
            if ( next != null )
            {
                next.visitCreatedNode( id );
            }
        }

        @Override
        public void visitDeletedNode( long id )
        {
            if ( next != null )
            {
                next.visitDeletedNode( id );
            }
        }

        @Override
        public void visitCreatedRelationship( long id, int type, long startNode, long endNode )
                throws ConstraintValidationKernelException
        {
            if ( next != null )
            {
                next.visitCreatedRelationship( id, type, startNode, endNode );
            }
        }

        @Override
        public void visitDeletedRelationship( long id )
        {
            if ( next != null )
            {
                next.visitDeletedRelationship( id );
            }
        }

        @Override
        public void visitNodePropertyChanges( long id,
                Iterator added, Iterator changed,
                Iterator removed ) throws ConstraintValidationKernelException
        {
            if ( next != null )
            {
                next.visitNodePropertyChanges( id, added, changed, removed );
            }
        }

        @Override
        public void visitNodeRelationshipChanges( long id, RelationshipChangesForNode added,
                RelationshipChangesForNode removed )
        {
            if ( next != null )
            {
                next.visitNodeRelationshipChanges( id, added, removed );
            }
        }

        @Override
        public void visitRelPropertyChanges( long id,
                Iterator added, Iterator changed,
                Iterator removed ) throws ConstraintValidationKernelException
        {
            if ( next != null )
            {
                next.visitRelPropertyChanges( id, added, changed, removed );
            }
        }

        @Override
        public void visitGraphPropertyChanges( Iterator added,
                Iterator changed, Iterator removed )
        {
            if ( next != null )
            {
                next.visitGraphPropertyChanges( added, changed, removed );
            }
        }

        @Override
        public void visitNodeLabelChanges( long id, Set added, Set removed )
                throws ConstraintValidationKernelException
        {
            if ( next != null )
            {
                next.visitNodeLabelChanges( id, added, removed );
            }
        }

        @Override
        public void visitAddedIndex( IndexDescriptor element, boolean isConstraintIndex )
        {
            if ( next != null )
            {
                next.visitAddedIndex( element, isConstraintIndex );
            }
        }

        @Override
        public void visitRemovedIndex( IndexDescriptor element, boolean isConstraintIndex )
        {
            if ( next != null )
            {
                next.visitRemovedIndex( element, isConstraintIndex );
            }
        }

        @Override
        public void visitAddedUniquePropertyConstraint( UniquenessConstraint element )
        {
            if ( next != null )
            {
                next.visitAddedUniquePropertyConstraint( element );
            }
        }

        @Override
        public void visitRemovedUniquePropertyConstraint( UniquenessConstraint element )
        {
            if ( next != null )
            {
                next.visitRemovedUniquePropertyConstraint( element );
            }
        }

        @Override
        public void visitAddedNodePropertyExistenceConstraint( NodePropertyExistenceConstraint element )
                throws CreateConstraintFailureException
        {
            if ( next != null )
            {
                next.visitAddedNodePropertyExistenceConstraint( element );
            }
        }

        @Override
        public void visitRemovedNodePropertyExistenceConstraint( NodePropertyExistenceConstraint element )
        {
            if ( next != null )
            {
                next.visitRemovedNodePropertyExistenceConstraint( element );
            }
        }

        @Override
        public void visitAddedRelationshipPropertyExistenceConstraint( RelationshipPropertyExistenceConstraint element )
                throws CreateConstraintFailureException
        {
            if ( next != null )
            {
                next.visitAddedRelationshipPropertyExistenceConstraint( element );
            }
        }

        @Override
        public void visitRemovedRelationshipPropertyExistenceConstraint(
                RelationshipPropertyExistenceConstraint element )
        {
            if ( next != null )
            {
                next.visitRemovedRelationshipPropertyExistenceConstraint( element );
            }
        }

        @Override
        public void visitCreatedLabelToken( String name, int id )
        {
            if ( next != null )
            {
                next.visitCreatedLabelToken( name, id );
            }
        }

        @Override
        public void visitCreatedPropertyKeyToken( String name, int id )
        {
            if ( next != null )
            {
                next.visitCreatedPropertyKeyToken( name, id );
            }
        }

        @Override
        public void visitCreatedRelationshipTypeToken( String name, int id )
        {
            if ( next != null )
            {
                next.visitCreatedRelationshipTypeToken( name, id );
            }
        }

        @Override
        public void visitCreatedNodeLegacyIndex( String name, Map config )
        {
            if ( next != null )
            {
                next.visitCreatedNodeLegacyIndex( name, config );
            }
        }

        @Override
        public void visitCreatedRelationshipLegacyIndex( String name, Map config )
        {
            if ( next != null )
            {
                next.visitCreatedRelationshipLegacyIndex( name, config );
            }
        }

        @Override
        public void visitCreatedProcedure( ProcedureDescriptor procedureDescriptor )
        {
            if( next != null )
            {
                next.visitCreatedProcedure( procedureDescriptor );
            }
        }

        @Override
        public void visitDroppedProcedure( ProcedureDescriptor procedureDescriptor )
        {
            if( next != null )
            {
                next.visitDroppedProcedure( procedureDescriptor );
            }
        }
    }
}