/*******************************************************************************
* Copyright (c) 2006, 2015 IBM Corporation 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:
* IBM Corporation - initial API and implementation
******************************************************************************/
package org.eclipse.ui.internal.navigator.extensions;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.ui.internal.navigator.NavigatorSafeRunnable;
import org.eclipse.ui.navigator.CommonDragAdapterAssistant;
/**
*
* Drag assistants allow clients to provide new TransferTypes to a particular
* viewer.
*
* @since 3.2
*
*/
public final class CommonDragAssistantDescriptor implements IViewerExtPtConstants {
private IConfigurationElement element;
/* package */ CommonDragAssistantDescriptor(IConfigurationElement aConfigElement) {
element = aConfigElement;
}
/**
* Create an instance of the {@link CommonDragAdapterAssistant} defined by
* this descriptor.
*
* @return an instance of the {@link CommonDragAdapterAssistant} or
* {@link SkeletonCommonDragAssistant} if a problem occurs with the
* instantiation.
*/
public CommonDragAdapterAssistant createDragAssistant() {
final CommonDragAdapterAssistant[] da = new CommonDragAdapterAssistant[1];
SafeRunner.run(new NavigatorSafeRunnable(element) {
@Override
public void run() throws Exception {
da[0] = (CommonDragAdapterAssistant) element.createExecutableExtension(ATT_CLASS);
}
});
if (da[0] != null)
return da[0];
return SkeletonCommonDragAssistant.INSTANCE;
}
}