plugins/org.eclipse.ocl.pivot/src/org/eclipse/ocl/pivot/library/oclany/OclAnyOclAsTypeOperation.java

/*******************************************************************************
 * Copyright (c) 2010, 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.oclany;

import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.ocl.pivot.StandardLibrary;
import org.eclipse.ocl.pivot.Type;
import org.eclipse.ocl.pivot.evaluation.Evaluator;
import org.eclipse.ocl.pivot.library.AbstractUntypedBinaryOperation;
import org.eclipse.ocl.pivot.messages.PivotMessages;
import org.eclipse.ocl.pivot.values.InvalidValueException;

/**
 * OclAnyOclAsTypeOperation realises the OclAny::oclAsType() library operation.
 */
public class OclAnyOclAsTypeOperation extends AbstractUntypedBinaryOperation
{
	public static final @NonNull OclAnyOclAsTypeOperation INSTANCE = new OclAnyOclAsTypeOperation();

	@Override
	public @Nullable Object evaluate(@NonNull Evaluator evaluator, @Nullable Object sourceVal, @Nullable Object argVal) {
		if (sourceVal instanceof InvalidValueException) {
			throw (InvalidValueException)sourceVal;
		}
		Type argType = asType(argVal);
		Type sourceType = evaluator.getIdResolver().getDynamicTypeOf(sourceVal);
		if (sourceVal == null) {
			throw new InvalidValueException(PivotMessages.IncompatibleOclAsTypeSourceType, sourceType, argType);
		}
		StandardLibrary standardLibrary = evaluator.getStandardLibrary();
		if (sourceType.conformsTo(standardLibrary, argType)) {
			return sourceVal;
		}
		EObject esSourceType = sourceType.getESObject();
		EObject esArgType = argType.getESObject();
		if ((esSourceType instanceof EClassifier) && (esArgType instanceof EClassifier)) {
			Class<?> sourceClass = ((EClassifier)esSourceType).getInstanceClass();
			Class<?> argClass = ((EClassifier)esArgType).getInstanceClass();
			if ((sourceClass != null) && (argClass != null) && argClass.isAssignableFrom(sourceClass)) {
				return sourceVal;
			}
		}
		throw new InvalidValueException(PivotMessages.IncompatibleOclAsTypeSourceType, sourceType, argType);
	}
}