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/*******************************************************************************
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* Copyright (c) 2006, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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******************************************************************************/
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package org.eclipse.ui.internal.navigator.extensions;
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import org.eclipse.core.runtime.IConfigurationElement;
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import org.eclipse.core.runtime.SafeRunner;
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import org.eclipse.ui.internal.navigator.NavigatorSafeRunnable;
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import org.eclipse.ui.navigator.CommonDragAdapterAssistant;
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/**
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*
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* Drag assistants allow clients to provide new TransferTypes to a particular
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* viewer.
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*
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* @since 3.2
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*
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*/
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public final class CommonDragAssistantDescriptor implements IViewerExtPtConstants {
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private IConfigurationElement element;
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/* package */ CommonDragAssistantDescriptor(IConfigurationElement aConfigElement) {
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element = aConfigElement;
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}
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/**
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* Create an instance of the {@link CommonDragAdapterAssistant} defined by
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* this descriptor.
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*
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* @return an instance of the {@link CommonDragAdapterAssistant} or
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* {@link SkeletonCommonDragAssistant} if a problem occurs with the
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* instantiation.
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*/
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public CommonDragAdapterAssistant createDragAssistant() {
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final CommonDragAdapterAssistant[] da = new CommonDragAdapterAssistant[1];
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SafeRunner.run(new NavigatorSafeRunnable(element) {
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public void run() throws Exception {
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da[0] = (CommonDragAdapterAssistant) element.createExecutableExtension(ATT_CLASS);
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}
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});
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if (da[0] != null)
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return da[0];
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return SkeletonCommonDragAssistant.INSTANCE;
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}
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}
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