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PrimitiveRelationshipStream.java
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PrimitiveRelationshipStream.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.cypher.internal.codegen;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.function.LongFunction;
import java.util.stream.LongStream;
import org.neo4j.cypher.internal.compiler.v3_2.spi.RelationshipIdWrapper;
import org.neo4j.graphdb.Relationship;
import static java.lang.String.format;
public class PrimitiveRelationshipStream extends PrimitiveEntityStream<RelationshipIdWrapper>
{
public PrimitiveRelationshipStream( LongStream inner )
{
super( inner );
}
public static PrimitiveRelationshipStream of( long[] array )
{
return new PrimitiveRelationshipStream( LongStream.of( array ) );
}
public static PrimitiveRelationshipStream of( Object list )
{
if ( null == list )
{
return empty;
}
else if ( list instanceof List )
{
return new PrimitiveRelationshipStream(
((List<Relationship>) list).stream().mapToLong( Relationship::getId ) );
}
else if ( list instanceof Relationship[] )
{
return new PrimitiveRelationshipStream(
Arrays.stream( (Relationship[]) list ).mapToLong( Relationship::getId ) );
}
throw new IllegalArgumentException( format( "Can not convert to stream: %s", list.getClass().getName() ) );
}
@Override
// This method is only used when we do not know the element type at compile time, so it has to box the elements
public Iterator<RelationshipIdWrapper> iterator()
{
return inner.mapToObj( (LongFunction<RelationshipIdWrapper>) RelationshipIdWrapperImpl::new ).iterator();
}
private static final PrimitiveRelationshipStream empty = new PrimitiveRelationshipStream( LongStream.empty() );
}