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ListConstraintsProcedure.java
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ListConstraintsProcedure.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.
*
* 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.builtinprocs;
import java.util.List;
import org.neo4j.collection.RawIterator;
import org.neo4j.kernel.api.Statement;
import org.neo4j.kernel.api.StatementTokenNameLookup;
import org.neo4j.kernel.api.TokenNameLookup;
import org.neo4j.kernel.api.constraints.PropertyConstraint;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.proc.CallableProcedure;
import org.neo4j.kernel.api.proc.Neo4jTypes;
import org.neo4j.kernel.api.proc.ProcedureSignature.ProcedureName;
import static org.neo4j.helpers.collection.Iterators.asList;
import static org.neo4j.helpers.collection.Iterators.asRawIterator;
import static org.neo4j.helpers.collection.Iterators.map;
import static org.neo4j.kernel.api.proc.CallableProcedure.Context.KERNEL_TRANSACTION;
import static org.neo4j.kernel.api.proc.ProcedureSignature.procedureSignature;
public class ListConstraintsProcedure extends CallableProcedure.BasicProcedure
{
protected ListConstraintsProcedure(ProcedureName procedureName)
{
super( procedureSignature( procedureName )
.out( "description", Neo4jTypes.NTString )
.build() );
}
@Override
public RawIterator<Object[],ProcedureException> apply( Context ctx, Object[] input )
throws ProcedureException
{
Statement statement = ctx.get( KERNEL_TRANSACTION ).acquireStatement();
TokenNameLookup tokens = new StatementTokenNameLookup(statement.readOperations());
List<PropertyConstraint> indexes =
asList( statement.readOperations().constraintsGetAll() );
indexes.sort( (a,b) -> a.userDescription(tokens).compareTo( b.userDescription(tokens) ) );
return map( ( item ) -> new Object[]{ item.userDescription(tokens) },
asRawIterator( indexes.iterator() ) );
}
}