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/*****************************************************************************
* Copyright (c) 2013, 2014 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:
* CEA LIST - Initial API and implementation
* Christian W. Damus (CEA) - bug 422257
*
*****************************************************************************/
package org.eclipse.papyrus.customization.properties.storage.actions;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.papyrus.customization.properties.Activator;
import org.eclipse.papyrus.infra.core.utils.OneTimeRegistryReader;
import org.eclipse.papyrus.infra.properties.contexts.Context;
/**
* This is the ContextStorageActionRegistry type. Enjoy.
*/
public class ContextStorageActionRegistry {
private static final String EXT_POINT = "contextStorage"; //$NON-NLS-1$
private final List<IContextStorageActionProvider> providers = new java.util.ArrayList<IContextStorageActionProvider>();
public ContextStorageActionRegistry() {
super();
new MyRegistryReader().readRegistry();
}
public List<IContextStorageActionProvider> getStorageActionProviders() {
return Collections.unmodifiableList(providers);
}
public IContextStorageActionProvider getStorageActionProvider(Context context) {
IContextStorageActionProvider result = IContextStorageActionProvider.READ_ONLY;
for (IContextStorageActionProvider next : providers) {
if (next.providesFor(context)) {
result = next;
break;
}
}
return result;
}
public IContextCopyAction getContextCopyAction(Context context) {
return getStorageActionProvider(context).getContextCopyAction();
}
public IContextEditAction getContextEditAction(Context context) {
return getStorageActionProvider(context).getContextEditAction();
}
public IContextDeleteAction getContextDeleteAction(Context context) {
return getStorageActionProvider(context).getContextDeleteAction();
}
//
// Nested types
//
private class MyRegistryReader extends OneTimeRegistryReader {
private static final String A_CLASS = "class"; //$NON-NLS-1$
private static final String E_ACTION_PROVIDER = "actionProvider"; //$NON-NLS-1$
private Map<IContextStorageActionProvider, IConfigurationElement> providerElements = new java.util.HashMap<IContextStorageActionProvider, IConfigurationElement>();
MyRegistryReader() {
super(Platform.getExtensionRegistry(), Activator.PLUGIN_ID, EXT_POINT);
}
@Override
public void readRegistry() {
super.readRegistry();
// sort any providers contributed by this plug-in to the front
Collections.sort(providers, new Comparator<IContextStorageActionProvider>() {
@Override
public int compare(IContextStorageActionProvider o1, IContextStorageActionProvider o2) {
int result = 0;
if (isOurs(o1)) {
result = isOurs(o2) ? 0 : -1;
} else if (isOurs(o2)) {
result = +1;
}
return result;
}
});
}
private boolean isOurs(IContextStorageActionProvider provider) {
boolean result = false;
IConfigurationElement config = providerElements.get(provider);
if (config != null) {
Activator.PLUGIN_ID.equals(config.getContributor().getName());
}
return result;
}
@Override
protected boolean readElement(IConfigurationElement element) {
boolean result = true;
if (E_ACTION_PROVIDER.equals(element.getName())) {
try {
providers.add((IContextStorageActionProvider) element.createExecutableExtension(A_CLASS));
} catch (Exception e) {
result = false;
Activator.log.error("Failed to instantiate context storage action provider extension.", e); //$NON-NLS-1$
}
}
return result;
}
}
}
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