plugins/org.eclipse.emf.edapt.declaration/src/org/eclipse/emf/edapt/declaration/simple/MakeFeatureVolatile.java

package org.eclipse.emf.edapt.declaration.simple;

import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.edapt.declaration.EdaptConstraint;
import org.eclipse.emf.edapt.declaration.EdaptOperation;
import org.eclipse.emf.edapt.declaration.EdaptParameter;
import org.eclipse.emf.edapt.declaration.OperationImplementation;
import org.eclipse.emf.edapt.migration.MigrationException;
import org.eclipse.emf.edapt.spi.migration.Instance;
import org.eclipse.emf.edapt.spi.migration.Metamodel;
import org.eclipse.emf.edapt.spi.migration.Model;

/**
 * {@description}
 *
 * @author herrmama
 * @author $Author$
 * @version $Rev$
 * @levd.rating YELLOW Hash: CBF0265BD4DA4AD17DAE8E4798A4A969
 */
@EdaptOperation(identifier = "makeFeatureVolatile", label = "Make Feature Volatile", description = "In the metamodel, a feature is made volatile. In the model, its values have to be deleted.", breaking = true)
public class MakeFeatureVolatile extends OperationImplementation {

	/** {@description} */
	@EdaptParameter(main = true, description = "The feature to be made volatile")
	public EStructuralFeature feature;

	/** {@description} */
	@EdaptConstraint(restricts = "feature", description = "Feature must not be volatile")
	public boolean checkFeatureNotVolatile(EStructuralFeature feature) {
		return !feature.isVolatile();
	}

	/** {@description} */
	@EdaptParameter(description = "Whether the feature is transient")
	public Boolean trans = true;

	/** {@description} */
	@EdaptParameter(description = "Whether the feature is derived")
	public Boolean derived = true;

	/** {@description} */
	@EdaptParameter(description = "Whether the feature is changeable")
	public Boolean changeable = false;

	/** {@inheritDoc} */
	@Override
	public void execute(Metamodel metamodel, Model model)
		throws MigrationException {
		// metamodel adaptation
		feature.setVolatile(true);
		feature.setTransient(trans);
		feature.setDerived(derived);
		feature.setChangeable(changeable);
		if (feature instanceof EReference) {
			final EReference reference = (EReference) feature;
			if (reference.getEOpposite() != null) {
				final DropOpposite operation = new DropOpposite();
				operation.reference = reference;
				operation.checkAndExecute(metamodel, model);
			}
		}

		// model migration
		for (final Instance instance : model.getAllInstances(feature
			.getEContainingClass())) {
			deleteFeatureValue(instance, feature);
		}
	}
}