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/*****************************************************************************
* Copyright (c) 2014, 2015 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 v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.assistant.internal.core;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gmf.runtime.common.core.service.IOperation;
import org.eclipse.gmf.runtime.common.core.service.IProviderChangeListener;
import org.eclipse.gmf.runtime.common.core.service.ProviderChangeEvent;
import org.eclipse.gmf.runtime.emf.type.core.IElementType;
import org.eclipse.gmf.runtime.emf.ui.services.modelingassistant.IModelingAssistantProvider;
import org.eclipse.gmf.runtime.notation.Diagram;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.infra.gmfdiag.common.utils.DiagramUtils;
import org.eclipse.papyrus.infra.viewpoints.policy.PolicyChecker;
import com.google.common.collect.Lists;
/**
* A Modeling Assistant provider that delegates to registered modeled providers.
*/
public class DelegatingModelingAssistantProvider implements IModelingAssistantProvider, IProviderChangeListener {
private final CopyOnWriteArrayList<IProviderChangeListener> listeners = new CopyOnWriteArrayList<>();
private final ThreadLocal<List<IModelingAssistantProvider>> currentProviders = new ThreadLocal<List<IModelingAssistantProvider>>() {
@Override
protected List<IModelingAssistantProvider> initialValue() {
return Lists.newArrayList();
}
};
public DelegatingModelingAssistantProvider() {
super();
}
@Override
public boolean provides(IOperation operation) {
// Query my providers
List<IModelingAssistantProvider> current = currentProviders.get();
current.clear();
for (IModelingAssistantProvider next : ModelingAssistantModelRegistry.getInstance().getModelingAssistantProviders()) {
if (next.provides(operation)) {
current.add(next);
}
}
return !current.isEmpty();
}
@Override
public void providerChanged(ProviderChangeEvent event) {
// Forward to my own listeners
if (!listeners.isEmpty()) {
ProviderChangeEvent forward = new ProviderChangeEvent(this);
for (IProviderChangeListener next : listeners) {
try {
next.providerChanged(forward);
} catch (Exception e) {
AssistantPlugin.log.error("Uncaught exception in provider change listener", e); //$NON-NLS-1$
}
}
}
}
@Override
public void addProviderChangeListener(IProviderChangeListener listener) {
listeners.addIfAbsent(listener);
}
@Override
public void removeProviderChangeListener(IProviderChangeListener listener) {
listeners.remove(listener);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public List getTypes(String hint, IAdaptable data) {
List result = Lists.newArrayList();
for (IModelingAssistantProvider next : currentProviders.get()) {
result.addAll(next.getTypes(hint, data));
}
currentProviders.get().clear();
return filterViewpointExclusions(data, result);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public List getRelTypesOnSource(IAdaptable source) {
List result = Lists.newArrayList();
for (IModelingAssistantProvider next : currentProviders.get()) {
result.addAll(next.getRelTypesOnSource(source));
}
currentProviders.get().clear();
return filterViewpointExclusions(source, result);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public List getRelTypesOnTarget(IAdaptable target) {
List result = Lists.newArrayList();
for (IModelingAssistantProvider next : currentProviders.get()) {
result.addAll(next.getRelTypesOnTarget(target));
}
currentProviders.get().clear();
return filterViewpointExclusions(target, result);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public List getRelTypesOnSourceAndTarget(IAdaptable source, IAdaptable target) {
List result = Lists.newArrayList();
for (IModelingAssistantProvider next : currentProviders.get()) {
result.addAll(next.getRelTypesOnSourceAndTarget(source, target));
}
currentProviders.get().clear();
return filterViewpointExclusions(source, result);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public List getRelTypesForSREOnSource(IAdaptable source) {
List result = Lists.newArrayList();
for (IModelingAssistantProvider next : currentProviders.get()) {
result.addAll(next.getRelTypesForSREOnSource(source));
}
return filterViewpointExclusions(source, result);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public List getRelTypesForSREOnTarget(IAdaptable target) {
List result = Lists.newArrayList();
for (IModelingAssistantProvider next : currentProviders.get()) {
result.addAll(next.getRelTypesForSREOnTarget(target));
}
currentProviders.get().clear();
return filterViewpointExclusions(target, result);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public List getTypesForSource(IAdaptable target, IElementType relationshipType) {
List result = Lists.newArrayList();
for (IModelingAssistantProvider next : currentProviders.get()) {
result.addAll(next.getTypesForSource(target, relationshipType));
}
currentProviders.get().clear();
return filterViewpointExclusions(target, result);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public List getTypesForTarget(IAdaptable source, IElementType relationshipType) {
List result = Lists.newArrayList();
for (IModelingAssistantProvider next : currentProviders.get()) {
result.addAll(next.getTypesForTarget(source, relationshipType));
}
currentProviders.get().clear();
return filterViewpointExclusions(source, result);
}
@Override
public EObject selectExistingElementForSource(IAdaptable target, IElementType relationshipType) {
EObject result = null;
for (IModelingAssistantProvider next : currentProviders.get()) {
result = next.selectExistingElementForSource(target, relationshipType);
if (result != null) {
break;
}
}
currentProviders.get().clear();
return result;
}
@Override
public EObject selectExistingElementForTarget(IAdaptable source, IElementType relationshipType) {
EObject result = null;
for (IModelingAssistantProvider next : currentProviders.get()) {
result = next.selectExistingElementForTarget(source, relationshipType);
if (result != null) {
break;
}
}
currentProviders.get().clear();
return result;
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public List getTypesForPopupBar(IAdaptable host) {
List result = Lists.newArrayList();
for (IModelingAssistantProvider next : currentProviders.get()) {
result.addAll(next.getTypesForPopupBar(host));
}
currentProviders.get().clear();
return filterViewpointExclusions(host, result);
}
protected List<? extends IElementType> filterViewpointExclusions(IAdaptable context, List<? extends IElementType> elementTypes) {
View view = (context == null) ? null : context.getAdapter(View.class);
Diagram diagram = (view == null) ? null : DiagramUtils.getContainingDiagram(view);
if (diagram != null) {
for (Iterator<? extends IElementType> iter = elementTypes.iterator(); iter.hasNext();) {
if (!PolicyChecker.getCurrent().isInModelingAssistants(diagram, iter.next())) {
iter.remove();
}
}
} // No diagram context? Nothing to filter
return elementTypes;
}
}
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