| /******************************************************************************* |
| * Copyright (c) 2018 Christian W. Damus and others. |
| * |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Christian W. Damus - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.emf.ecp.ui.view.swt.reference; |
| |
| import java.util.Collection; |
| |
| import org.eclipse.emf.ecore.EClass; |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.emf.ecore.EReference; |
| import org.eclipse.emfforms.bazaar.Vendor; |
| |
| /** |
| * A <em>customization strategy</em> for accumulating {@link EClass}es for instantiation to create a new |
| * object in a reference. Used by the {@link DefaultCreateNewModelElementStrategyProvider}. |
| * |
| * @since 1.16 |
| * |
| * @see org.eclipse.emf.ecp.ui.view.swt.DefaultReferenceService DefaultReferenceService |
| */ |
| public interface EClassSelectionStrategy { |
| /** An idempotent strategy (does not modify the selection). */ |
| EClassSelectionStrategy NULL = new EClassSelectionStrategy() { |
| @Override |
| public Collection<EClass> collectEClasses(EObject owner, EReference reference, Collection<EClass> eclasses) { |
| return eclasses; |
| } |
| }; |
| |
| /** |
| * Update a collection of {@link EClass}es that are eligible for creation of |
| * a new object in the reference. |
| * |
| * @param owner the proposed owner of a new reference |
| * @param reference the {@code owner}'s reference in which to add a new object |
| * @param eclasses a mutable collection of classes. Implementors may add and remove |
| * elements in this collection as needed |
| * |
| * @return a mutable filtered collection of classes that can be passed into the |
| * next strategy. A suggested pattern is to modify the {@code eclasses} in place |
| * and return that collection |
| */ |
| Collection<EClass> collectEClasses(EObject owner, EReference reference, Collection<EClass> eclasses); |
| |
| // |
| // Nested types |
| // |
| |
| /** |
| * Specific Bazaar vendor interface for {@code EClass} selection strategies. |
| * |
| * @since 1.16 |
| */ |
| public interface Provider extends Vendor<EClassSelectionStrategy> { |
| // Nothing to add to the superinterface |
| } |
| |
| } |