CrossReferenceUtil.java

/**
 * Copyright (c) 2004-2025 Carnegie Mellon University and others. (see Contributors file).
 * All Rights Reserved.
 *
 * NO WARRANTY. ALL MATERIAL IS FURNISHED ON AN "AS-IS" BASIS. CARNEGIE MELLON UNIVERSITY MAKES NO WARRANTIES OF ANY
 * KIND, EITHER EXPRESSED OR IMPLIED, AS TO ANY MATTER INCLUDING, BUT NOT LIMITED TO, WARRANTY OF FITNESS FOR PURPOSE
 * OR MERCHANTABILITY, EXCLUSIVITY, OR RESULTS OBTAINED FROM USE OF THE MATERIAL. CARNEGIE MELLON UNIVERSITY DOES NOT
 * MAKE ANY WARRANTY OF ANY KIND WITH RESPECT TO FREEDOM FROM PATENT, TRADEMARK, OR COPYRIGHT INFRINGEMENT.
 *
 * This program and the accompanying materials are made available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 * SPDX-License-Identifier: EPL-2.0
 *
 * Created, in part, with funding and support from the United States Government. (see Acknowledgments file).
 *
 * This program includes and/or can make use of certain third party source code, object code, documentation and other
 * files ("Third Party Software"). The Third Party Software that is used by this program is dependent upon your system
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 * Software. The parties who own the Third Party Software ("Third Party Licensors") are intended third party benefici-
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 */
package org.osate.analysis.modes.reachability;

import java.util.Iterator;

import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature.Setting;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.util.ECrossReferenceAdapter;
import org.eclipse.emf.ecore.util.EcoreUtil;

public class CrossReferenceUtil {

	private CrossReferenceUtil() {
		// utility class
	}

	public static <T> Iterator<T> getInverse(EReference reference, EObject object, Notifier context) {
		if (context == null) {
			context = getContext(object);
		}
		ECrossReferenceAdapter adapter = ECrossReferenceAdapter.getCrossReferenceAdapter(context);
		if (adapter == null) {
			adapter = new ECrossReferenceAdapter();
			context.eAdapters().add(adapter);
		}
		return new EcoreUtil.AbstractFilteredSettingsIterator<T>(adapter.getInverseReferences(object, true), reference,
				null) {
			@SuppressWarnings("unchecked")
			@Override
			protected T yield(Setting setting) {
				return (T) setting.getEObject();
			}
		};
	}

	public static Notifier getContext(EObject object) {
		EObject root = EcoreUtil.getRootContainer(object);
		Resource resource = root.eResource();
		if (resource != null) {
			ResourceSet resourceSet = resource.getResourceSet();
			return resourceSet != null ? (Notifier) resourceSet : resource;
		}
		return root;
	}

}