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ListLabelsProcedure.java
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ListLabelsProcedure.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 org.neo4j.collection.RawIterator;
import org.neo4j.graphdb.Label;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.proc.Neo4jTypes;
import org.neo4j.kernel.api.proc.Procedure;
import org.neo4j.kernel.api.proc.ProcedureSignature.ProcedureName;
import org.neo4j.kernel.impl.api.TokenAccess;
import static org.neo4j.helpers.collection.Iterables.asRawIterator;
import static org.neo4j.helpers.collection.Iterables.map;
import static org.neo4j.kernel.api.ReadOperations.statement;
import static org.neo4j.kernel.api.proc.ProcedureSignature.procedureSignature;
public class ListLabelsProcedure extends Procedure.BasicProcedure
{
public ListLabelsProcedure( ProcedureName name )
{
super( procedureSignature( name ).out( "label", Neo4jTypes.NTString ).build() );
}
@Override
public RawIterator<Object[], ProcedureException> apply( Context ctx, Object[] input ) throws ProcedureException
{
RawIterator<Label,ProcedureException> labels = asRawIterator( TokenAccess.LABELS.inUse( ctx.get( statement ) ) );
return map( ( l) -> new Object[]{l.name()}, labels );
}
}