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/*****************************************************************************
* Copyright (c) 2013, 2017 CEA LIST and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Laurent Wouters laurent.wouters@cea.fr - Initial API and implementation
* Christian W. Damus - bug 527580
*
*****************************************************************************/
package org.eclipse.papyrus.infra.viewpoints.policy;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.papyrus.infra.architecture.representation.PapyrusRepresentationKind;
/**
* Partial implementation of a view-type helper.
*
* @author Laurent Wouters
*
* @since 3.0
*/
public abstract class AbstractViewTypeHelper<T extends PapyrusRepresentationKind> implements IViewTypeHelper {
private final Class<T> representationType;
/**
* The cache of prototypes.
*/
private final Map<T, ViewPrototype> cache = new HashMap<>();
protected AbstractViewTypeHelper(Class<T> representationType) {
super();
this.representationType = representationType;
}
/**
* Queries the type of representation kind that I support.
*
* @return my representation type
*/
protected final Class<T> getRepresentationType() {
return representationType;
}
@Override
public boolean isSupported(EClass type) {
return getRepresentationType().isAssignableFrom(type.getInstanceClass());
}
@Override
public ViewPrototype getPrototypeFor(PapyrusRepresentationKind kind) {
if (!isSupported(kind.eClass())) {
return null;
}
T specificKind = getRepresentationType().cast(kind);
ViewPrototype result = cache.get(specificKind);
if (result != null) {
// The unavailable type records an explicit null result in the cache
if (result.isUnavailable()) {
result = null;
}
return result;
}
result = doGetPrototypeFor(specificKind);
if (result == null) {
// Record the explicit null result
cache.put(specificKind, ViewPrototype.UNAVAILABLE_VIEW);
} else {
cache.put(specificKind, result);
}
return result;
}
/**
* Determines the view prototype type for the given specific representation {@code kind}.
*
* @param kind
* the specific representation kind
* @return the view prototype, or {@code null} if there is none for the {@code kind}
* or somehow it failed to be determined
*/
protected abstract ViewPrototype doGetPrototypeFor(T kind);
@Override
public ViewPrototype getPrototypeOf(EObject view) {
if (!isSupported(view)) {
return null;
}
return doGetPrototypeOf(view);
}
/**
* Determines the view prototype for the given supported {@code view} object.
*
* @param view
* a view known to the {@linkplain #isSupported(EObject) supported} by this helper
* @return its view prototype
*/
protected abstract ViewPrototype doGetPrototypeOf(EObject view);
/**
* Obtains the most appropriate policy-checker for a {@code view}.
*
* @param view
* a view object
* @return its policy-checker
*/
protected PolicyChecker getPolicyChecker(EObject view) {
return PolicyChecker.getFor(view);
}
}
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