| /******************************************************************************* |
| * Copyright (c) 2009, 2013 E.D.Willink 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.examples.library.collection; |
| |
| import org.eclipse.jdt.annotation.NonNull; |
| import org.eclipse.jdt.annotation.Nullable; |
| import org.eclipse.ocl.examples.domain.library.AbstractSimpleUnaryOperation; |
| import org.eclipse.ocl.examples.domain.messages.EvaluatorMessages; |
| import org.eclipse.ocl.examples.domain.values.CollectionValue; |
| import org.eclipse.ocl.examples.domain.values.impl.InvalidValueException; |
| import org.eclipse.ocl.examples.library.numeric.NumericMinOperation; |
| |
| /** |
| * CollectionMinOperation realises the Collection::min() library operation. |
| */ |
| public class CollectionMinOperation extends AbstractSimpleUnaryOperation |
| { |
| public static final @NonNull CollectionMinOperation INSTANCE = new CollectionMinOperation(); |
| |
| @Override |
| public @NonNull Object evaluate(@Nullable Object sourceVal) { |
| CollectionValue collectionValue = asCollectionValue(sourceVal); |
| // FIXME Bug 301351 Look for user-defined min |
| Object result = null; |
| for (Object element : collectionValue.iterable()) { |
| if (result == null) { |
| result = element; |
| } |
| else if (element != null) { |
| result = NumericMinOperation.INSTANCE.evaluate(result, element); |
| } |
| } |
| if (result == null) { |
| throw new InvalidValueException(EvaluatorMessages.EmptyCollection, collectionValue.getKind(), "min"); //$NON-NLS-1$ |
| } |
| return result; |
| } |
| } |