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ConstraintBoundary.java
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ConstraintBoundary.java
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/*
* Copyright (c) 2002-2017 "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 <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.api.schema_new.constaints;
import java.util.Iterator;
import org.neo4j.helpers.collection.Iterators;
import org.neo4j.kernel.api.constraints.NodePropertyConstraint;
import org.neo4j.kernel.api.constraints.NodePropertyExistenceConstraint;
import org.neo4j.kernel.api.constraints.PropertyConstraint;
import org.neo4j.kernel.api.constraints.RelationshipPropertyConstraint;
import org.neo4j.kernel.api.constraints.RelationshipPropertyExistenceConstraint;
import org.neo4j.kernel.api.constraints.UniquenessConstraint;
import org.neo4j.kernel.api.schema.NodePropertyDescriptor;
import org.neo4j.kernel.api.schema.RelationshipPropertyDescriptor;
import org.neo4j.kernel.api.schema_new.LabelSchemaDescriptor;
import org.neo4j.kernel.api.schema_new.RelationTypeSchemaDescriptor;
import org.neo4j.kernel.api.schema_new.SchemaBoundary;
import org.neo4j.kernel.api.schema_new.SchemaComputer;
/**
* This class represents the boundary of where new constraint descriptors are converted to old constraints. This class
* should disappear once the old constraints are no longer used.
*/
public class ConstraintBoundary
{
public static PropertyConstraint map( ConstraintDescriptor descriptor )
{
return descriptor.schema().computeWith( new BoundaryTransformer( descriptor ) );
}
public static UniquenessConstraint mapUnique( ConstraintDescriptor descriptor )
{
return (UniquenessConstraint) descriptor.schema().computeWith( new BoundaryTransformer( descriptor ) );
}
public static NodePropertyConstraint mapNode( ConstraintDescriptor descriptor )
{
return (NodePropertyConstraint) descriptor.schema().computeWith( new BoundaryTransformer( descriptor ) );
}
public static RelationshipPropertyConstraint mapRelationship( ConstraintDescriptor descriptor )
{
return (RelationshipPropertyConstraint) descriptor.schema()
.computeWith( new BoundaryTransformer( descriptor ) );
}
public static ConstraintDescriptor map( PropertyConstraint constraint )
{
if ( constraint instanceof UniquenessConstraint )
{
UniquenessConstraint c = (UniquenessConstraint) constraint;
return ConstraintDescriptorFactory.uniqueForSchema( SchemaBoundary.map( c.descriptor() ) );
}
if ( constraint instanceof NodePropertyExistenceConstraint )
{
NodePropertyExistenceConstraint c = (NodePropertyExistenceConstraint) constraint;
return ConstraintDescriptorFactory.existsForSchema( SchemaBoundary.map( c.descriptor() ) );
}
if ( constraint instanceof RelationshipPropertyExistenceConstraint )
{
RelationshipPropertyExistenceConstraint c = (RelationshipPropertyExistenceConstraint) constraint;
return ConstraintDescriptorFactory.existsForSchema( SchemaBoundary.map( c.descriptor() ) );
}
throw new IllegalStateException( "Unknown constraint type "+ constraint.getClass().getSimpleName() );
}
public static <T extends PropertyConstraint> Iterator<ConstraintDescriptor> mapToNew(
Iterator<T> constraints )
{
return Iterators.map( ConstraintBoundary::map, constraints );
}
public static Iterator<PropertyConstraint> map( Iterator<ConstraintDescriptor> constraints )
{
return Iterators.map( ConstraintBoundary::map, constraints );
}
private static class BoundaryTransformer implements SchemaComputer<PropertyConstraint>
{
private final ConstraintDescriptor descriptor;
BoundaryTransformer( ConstraintDescriptor descriptor )
{
this.descriptor = descriptor;
}
@Override
public PropertyConstraint computeSpecific( LabelSchemaDescriptor schema )
{
switch ( descriptor.type() )
{
case UNIQUE:
return new UniquenessConstraint( new NodePropertyDescriptor(
schema.getLabelId(), schema.getPropertyId() ) );
case EXISTS:
return new NodePropertyExistenceConstraint( new NodePropertyDescriptor(
schema.getLabelId(), schema.getPropertyId() ) );
default:
throw new UnsupportedOperationException( "Although we cannot get here, this has not been implemented." );
}
}
@Override
public PropertyConstraint computeSpecific( RelationTypeSchemaDescriptor schema )
{
return new RelationshipPropertyExistenceConstraint( new RelationshipPropertyDescriptor(
schema.getRelTypeId(), schema.getPropertyId() ) );
}
}
}