| /******************************************************************************* |
| * Copyright (c) 2009, 2018 SAP AG 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: |
| * Axel Uhl - Initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ocl.ecore.opposites; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.WeakHashMap; |
| |
| import org.eclipse.emf.common.notify.Adapter; |
| import org.eclipse.emf.common.notify.Notifier; |
| import org.eclipse.emf.ecore.EClass; |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.emf.ecore.resource.Resource; |
| import org.eclipse.emf.ecore.resource.ResourceSet; |
| import org.eclipse.emf.ecore.util.EContentAdapter; |
| import org.eclipse.emf.ecore.util.EcoreUtil; |
| |
| /** |
| * A content adapter that maintains a map of all {@link EObject}s in the scope observed (typically |
| * a {@link ResourceSet}), keyed by the {@link EClass}es to which the objects conform. This allows |
| * for fast lookup, e.g., of an <code>allInstances()</code> expression value in the given scope. |
| * |
| * @author Axel Uhl |
| * @since 3.1 |
| * |
| */ |
| public class AllInstancesContentAdapter extends EContentAdapter { |
| private Map<EClass, WeakHashMap<EObject, Object>> allInstances = new HashMap<EClass, WeakHashMap<EObject, Object>>(); |
| |
| /** |
| * Looks up an adapter of type {@link AllInstancesContentAdapter} in the adapter list of |
| * <code>context</code>'s root context. The root context is determined by ascending the {@link EObject} |
| * containment hierarchy, then to a {@link Resource} and perhaps a {@link ResourceSet}. The last element |
| * reachable in this order is the root context. If on this root context an adapter of type |
| * {@link AllInstancesContentAdapter} is already registered, it is returned. Otherwise, a new |
| * adapter of this class is created and added to the root context's adapter list. This will recursively |
| * apply the adapter to all contents, populating the adapter's <code>allInstances</code> map so that |
| * afterwards {@link #allInstances(EClass)} returns results in the scope of <code>context</code>'s |
| * root context. |
| */ |
| public static AllInstancesContentAdapter getInstanceForRootContextOf(Notifier context) { |
| Notifier rootContext = getRootContext(context); |
| for (Adapter a : rootContext.eAdapters()) { |
| if (a instanceof AllInstancesContentAdapter) { |
| return (AllInstancesContentAdapter) a; |
| } |
| } |
| AllInstancesContentAdapter result = new AllInstancesContentAdapter(); |
| rootContext.eAdapters().add(result); |
| return result; |
| } |
| |
| private static Notifier getRootContext(Notifier context) { |
| Notifier rootContext; |
| if (context instanceof ResourceSet) { |
| rootContext = context; |
| } else if (context instanceof Resource) { |
| if (((Resource) context).getResourceSet() != null) { |
| rootContext = ((Resource) context).getResourceSet(); |
| } else { |
| rootContext = context; |
| } |
| } else if (context instanceof EObject) { |
| EObject rootEObject = EcoreUtil.getRootContainer((EObject) context); |
| Resource rootResource = rootEObject.eResource(); |
| if (rootResource != null) { |
| ResourceSet rootResourceSet = rootResource.getResourceSet(); |
| if (rootResourceSet != null) { |
| rootContext = rootResourceSet; |
| } else { |
| rootContext = rootResource; |
| } |
| } else { |
| rootContext = rootEObject; |
| } |
| } else { |
| throw new RuntimeException("What type of Notifier is this? " + context.getClass().getName()); //$NON-NLS-1$ |
| } |
| return rootContext; |
| } |
| |
| @Override |
| protected void setTarget(EObject target) { |
| for (EClass c : target.eClass().getEAllSuperTypes()) { |
| put(c, target); |
| } |
| put(target.eClass(), target); |
| super.setTarget(target); |
| } |
| |
| private void put(EClass c, EObject target) { |
| WeakHashMap<EObject, Object> set = allInstances.get(c); |
| if (set == null) { |
| set = new WeakHashMap<EObject, Object>(); |
| allInstances.put(c, set); |
| } |
| set.put(target, null); |
| } |
| |
| @Override |
| protected void unsetTarget(EObject target) { |
| for (EClass c : target.eClass().getEAllSuperTypes()) { |
| remove(c, target); |
| } |
| remove(target.eClass(), target); |
| super.unsetTarget(target); |
| } |
| |
| private void remove(EClass c, EObject target) { |
| WeakHashMap<EObject, Object> set = allInstances.get(c); |
| if (set != null) { |
| if (set.remove(target) != null) { |
| if (set.isEmpty()) { |
| allInstances.remove(c); |
| } |
| } |
| } |
| } |
| |
| public Set<EObject> allInstances(EClass c) { |
| WeakHashMap<EObject, Object> map = allInstances.get(c); |
| Set<EObject> result; |
| if (map == null) { |
| result = Collections.emptySet(); |
| } else { |
| result = map.keySet(); |
| } |
| return result; |
| } |
| } |