/*******************************************************************************
* Copyright (c) 2015 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.map;
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.MapValue;
/**
* MapAtOperation realises the Map::isEmpty() library operation.
*/
public class MapIsEmptyOperation extends AbstractSimpleUnaryOperation
{
public static final @NonNull MapIsEmptyOperation INSTANCE = new MapIsEmptyOperation();
@Override
public @Nullable Object evaluate(@Nullable Object source) {
MapValue mapValue = asMapValue(source);
return mapValue.isEmpty();
}
}