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ResultRowImpl.java
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ResultRowImpl.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.cypher.internal.compiler.v3_1.codegen;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import org.neo4j.cypher.internal.compiler.v3_1.spi.InternalResultRow;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Path;
import org.neo4j.graphdb.Relationship;
public class ResultRowImpl implements InternalResultRow
{
private Map<String, Object> results;
public ResultRowImpl( Map<String, Object> results )
{
this.results = results;
}
public ResultRowImpl( )
{
this( new HashMap<>() );
}
public void set( String k, Object value)
{
results.put( k, value );
}
@Override
public Object get( String key )
{
return get( key, Object.class );
}
@Override
public Node getNode( String key )
{
return get( key, Node.class );
}
@Override
public Relationship getRelationship( String key )
{
return get( key, Relationship.class );
}
@Override
public String getString( String key )
{
return get( key, String.class );
}
@Override
public Number getNumber( String key )
{
return get( key, Number.class );
}
@Override
public Boolean getBoolean( String key )
{
return get( key, Boolean.class );
}
@Override
public Path getPath( String key )
{
return get( key, Path.class );
}
private <T> T get( String key, Class<T> type )
{
Object value = results.get( key );
if ( value == null && !results.containsKey( key ) )
{
throw new IllegalArgumentException( "No column \"" + key + "\" exists" );
}
try
{
return type.cast( value );
}
catch ( ClassCastException e )
{
String message = String.format("The current item in column \"%s\" is not a %s; it's \"%s\"",
key, type.getSimpleName(), value);
throw new NoSuchElementException(message);
}
}
}