/*******************************************************************************
* Copyright (c) 2010, 2014 Willink Transformations and others.
* 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:
* E.D.Willink - Initial API and implementation
*******************************************************************************/
package org.eclipse.ocl.pivot.library.collection;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.ocl.pivot.library.AbstractSimpleUnaryOperation;
import org.eclipse.ocl.pivot.values.SequenceValue;
/**
* OrderedCollectionFirstOperation realises the OrderedCollection::first() library operation.
*/
public class OrderedCollectionFirstOperation extends AbstractSimpleUnaryOperation
{
public static final @NonNull OrderedCollectionFirstOperation INSTANCE = new OrderedCollectionFirstOperation();
@Override
public @Nullable Object evaluate(@Nullable Object argument) {
SequenceValue orderedCollectionValue = asSequenceValue(argument);
return orderedCollectionValue.first();
}
}