imported patch MET-ModelTransformationNested.patch

prism/src/explicit/ModelTransformationNested.java

@@ -0,0 +1,80 @@
+//==============================================================================
+//
+//	Copyright (c) 2015-
+//	Authors:
+//	* Joachim Klein <klein@tcs.inf.tu-dresden.de> (TU Dresden)
+//	* Steffen Märcker <maercker@tcs.inf.tu-dresden.de> (TU Dresden)
+//
+//------------------------------------------------------------------------------
+//
+//	This file is part of PRISM.
+//	
+//	PRISM is free software; you can redistribute it and/or modify
+//	it under the terms of the GNU General Public License as published by
+//	the Free Software Foundation; either version 2 of the License, or
+//	(at your option) any later version.
+//
+//	PRISM is distributed in the hope that it will be useful,
+//	but WITHOUT ANY WARRANTY; without even the implied warranty of
+//	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//	GNU General Public License for more details.
+//
+//	You should have received a copy of the GNU General Public License
+//	along with PRISM; if not, write to the Free Software Foundation,
+//	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//==============================================================================
+
+package explicit;
+
+import prism.PrismException;
+
+/**
+ * Combines two (compatible) ModelTransformation.
+ * <br>
+ * The inner transformation is applied first, with the result
+ * serving as the input for the second, outer transformation.
+ *
+ * @param <OriginalModel> The input type for the inner transformation
+ * @param <IntermediateModel> The output type for the inner and the input type for the outer transformation
+ * @param <TransformedModel> The output type for the outer transformation
+ */
+public class ModelTransformationNested<OriginalModel extends Model,
+                                       IntermediateModel extends Model,
+                                       TransformedModel extends Model>
+	implements ModelTransformation<OriginalModel, TransformedModel>
+{
+	protected final ModelTransformation<? extends OriginalModel, ? extends IntermediateModel> innerTransformation;
+	protected final ModelTransformation<? extends IntermediateModel, ? extends TransformedModel> outerTransformation;
+
+	public ModelTransformationNested(final ModelTransformation<? extends OriginalModel, ? extends IntermediateModel> inner,
+                                     final ModelTransformation<? extends IntermediateModel, ? extends TransformedModel> outer)
+	{
+		if (inner.getTransformedModel() != outer.getOriginalModel()) {
+			throw new IllegalArgumentException("Trying to nest unrelated ModelTransformations.");
+		}
+		this.innerTransformation = inner;
+		this.outerTransformation = outer;
+	}
+
+	@Override
+	public OriginalModel getOriginalModel()
+	{
+		return innerTransformation.getOriginalModel();
+	}
+
+	@Override
+	public TransformedModel getTransformedModel()
+	{
+		return outerTransformation.getTransformedModel();
+	}
+
+	@Override
+	public StateValues projectToOriginalModel(final StateValues svTransformedModel) throws PrismException
+	{
+		// First, project the StateValues to the intermediate model.
+		StateValues svIntermediate = outerTransformation.projectToOriginalModel(svTransformedModel);
+		// Second, project them to the original model
+		return innerTransformation.projectToOriginalModel(svIntermediate);
+	}
+}