plugins/org.eclipse.uml2.common.edit/src/org/eclipse/uml2/common/edit/command/SupersetRemoveCommand.java

/*
 * Copyright (c) 2003, 2018 IBM Corporation and others.
 * All rights reserved.   This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v20.html
 *
 * Contributors:
 *   IBM - initial API and implementation
 *   Kenn Hussey - 535301
 *
 */
package org.eclipse.uml2.common.edit.command;

import java.util.Collection;
import java.util.Collections;

import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.edit.command.RemoveCommand;
import org.eclipse.emf.edit.command.SetCommand;
import org.eclipse.emf.edit.domain.EditingDomain;

public class SupersetRemoveCommand
		extends SupersetCommand {

	protected final Collection<?> collection;

	public SupersetRemoveCommand(EditingDomain domain, EObject owner,
			EStructuralFeature feature, EStructuralFeature[] subsetFeatures,
			Collection<?> collection) {
		super(domain, owner, feature, subsetFeatures, new RemoveCommand(domain,
			owner, feature, collection));

		this.collection = collection;
	}

	@Override
	public void execute() {

		if (subsetFeatures != null) {

			for (Object element : collection) {

				for (int i = 0; i < subsetFeatures.length; i++) {

					if (subsetFeatures[i].isMany()) {
						@SuppressWarnings("unchecked")
						EList<EObject> values = (EList<EObject>) owner
							.eGet(subsetFeatures[i]);

						if (values.contains(element)) {
							appendAndExecute(RemoveCommand.create(domain,
								owner, subsetFeatures[i], Collections
									.singleton(element)));
						}
					} else {

						if (element == owner.eGet(subsetFeatures[i])) {
							EReference subsetReference = (EReference) subsetFeatures[i];

							appendAndExecute(subsetReference.isContainer()
								&& !subsetReference.getEOpposite().isMany()
								? new SetCommand(domain, owner,
									subsetFeatures[i], null)
								: SetCommand.create(domain, owner,
									subsetFeatures[i], null));
						}
					}
				}
			}
		}

		super.execute();
	}

}