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/*******************************************************************************
* Copyright (c) 2005, 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.navigator;
import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.ui.internal.navigator.NavigatorContentService;
/**
* Provides a factory pattern for creating {@link INavigatorContentService}s
* for given viewer ids.
*
* <p>
* Clients may supply the viewer in {@link #createContentService(String, StructuredViewer) }
* or wait until the content provider is created by the service
* and set on the viewer. When the content provider is set, the
* viewer will call inputChanged(), and the content service
* will update its managed viewer accordingly. Therefore, each
* content service should be attached to at most one viewer.
* </p>
*
* @since 3.2
*
*/
public final class NavigatorContentServiceFactory {
/**
* The singleton instance for creating NavigatorContentServices.
*/
public static final NavigatorContentServiceFactory INSTANCE = new NavigatorContentServiceFactory();
/**
* Returns an instance of INavigatorContentService configured
* for the given id. Instances are not shared for the same
* viewerId.
*
* @param aViewerId The viewer id of interest
* @return An instance of INavigatorContentService configured for the given id.
*/
public INavigatorContentService createContentService(String aViewerId) {
return createContentService(aViewerId, null);
}
/**
* Returns an instance of INavigatorContentService configured
* for the given id. Instances are not shared for the same
* viewerId.
*
* @param aViewerId The viewer id of interest
* @param aViewer The content service can use the given viewer to initialize content providers
* @return An instance of INavigatorContentService configured for the given id.
* @see IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, Object, Object)
*/
public INavigatorContentService createContentService(String aViewerId, StructuredViewer aViewer) {
if(aViewer == null) {
return new NavigatorContentService(aViewerId);
}
return new NavigatorContentService(aViewerId, aViewer);
}
}
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