/******************************************************************************
* Copyright (c) 2016 Oracle
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Konstantin Komissarchik - initial implementation and ongoing maintenance
******************************************************************************/
package org.eclipse.sapphire.modeling.el;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Function that constructs a list from arbitrary number of operands.
*
* @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a>
*/
public final class ListFunction extends Function
{
@Override
public String name()
{
return "List";
}
@Override
public FunctionResult evaluate( final FunctionContext context )
{
return new FunctionResult( this, context )
{
@Override
protected Object evaluate()
{
final int size = operands().size();
if( size == 0 )
{
return Collections.emptyList();
}
else if( size == 1 )
{
return Collections.singletonList( operand( 0 ) );
}
else
{
final List<Object> list = new ArrayList<Object>();
for( int i = 0; i < size; i++ )
{
list.add( operand( i ) );
}
return list;
}
}
};
}
}