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StandardConstraintSemantics.java
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StandardConstraintSemantics.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.impl.constraints;
import java.util.Iterator;
import org.neo4j.cursor.Cursor;
import org.neo4j.kernel.api.constraints.NodePropertyExistenceConstraint;
import org.neo4j.kernel.api.constraints.PropertyConstraint;
import org.neo4j.kernel.api.constraints.RelationshipPropertyExistenceConstraint;
import org.neo4j.kernel.api.exceptions.schema.CreateConstraintFailureException;
import org.neo4j.kernel.impl.store.record.PropertyConstraintRule;
import org.neo4j.kernel.impl.store.record.UniquePropertyConstraintRule;
import org.neo4j.storageengine.api.NodeItem;
import org.neo4j.storageengine.api.RelationshipItem;
import org.neo4j.storageengine.api.StoreReadLayer;
import org.neo4j.storageengine.api.txstate.ReadableTransactionState;
import org.neo4j.storageengine.api.txstate.TxStateVisitor;
public class StandardConstraintSemantics implements ConstraintSemantics
{
public static final String ERROR_MESSAGE = "Property existence constraint requires Neo4j Enterprise Edition";
@Override
public void validateNodePropertyExistenceConstraint( Iterator<Cursor<NodeItem>> allNodes, int label,
int propertyKey ) throws CreateConstraintFailureException
{
throw propertyExistenceConstraintsNotAllowed( new NodePropertyExistenceConstraint( label, propertyKey ) );
}
@Override
public void validateRelationshipPropertyExistenceConstraint( Cursor<RelationshipItem> allRels, int type,
int key ) throws CreateConstraintFailureException
{
throw propertyExistenceConstraintsNotAllowed( new RelationshipPropertyExistenceConstraint( type, key ) );
}
@Override
public PropertyConstraint readConstraint( PropertyConstraintRule rule )
{
if ( rule instanceof UniquePropertyConstraintRule )
{
return ((UniquePropertyConstraintRule) rule).toConstraint();
}
return readNonStandardConstraint( rule );
}
protected PropertyConstraint readNonStandardConstraint( PropertyConstraintRule rule )
{
// When opening a store in Community Edition that contains a Property Existence Constraint
throw new IllegalStateException( ERROR_MESSAGE );
}
private CreateConstraintFailureException propertyExistenceConstraintsNotAllowed( PropertyConstraint constraint )
{
// When creating a Property Existence Constraint in Community Edition
return new CreateConstraintFailureException( constraint, new IllegalStateException( ERROR_MESSAGE ) );
}
@Override
public PropertyConstraintRule writeUniquePropertyConstraint( long ruleId, int label, int propertyKey, long indexId )
{
return UniquePropertyConstraintRule.uniquenessConstraintRule( ruleId, label, propertyKey, indexId );
}
@Override
public PropertyConstraintRule writeNodePropertyExistenceConstraint( long ruleId, int label, int propertyKey )
throws CreateConstraintFailureException
{
throw propertyExistenceConstraintsNotAllowed( new NodePropertyExistenceConstraint( label, propertyKey ) );
}
@Override
public PropertyConstraintRule writeRelationshipPropertyExistenceConstraint( long ruleId, int type, int key )
throws CreateConstraintFailureException
{
throw propertyExistenceConstraintsNotAllowed( new RelationshipPropertyExistenceConstraint( type, key ) );
}
@Override
public TxStateVisitor decorateTxStateVisitor( StoreReadLayer storeLayer, ReadableTransactionState txState,
TxStateVisitor visitor )
{
return visitor;
}
}