| /******************************************************************************* |
| * Copyright (c) 2004, 2007 Boeing. |
| * 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: |
| * Boeing - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.osee.framework.ui.skynet; |
| |
| import java.util.Collection; |
| import java.util.logging.Level; |
| import org.eclipse.jface.viewers.IContentProvider; |
| import org.eclipse.jface.viewers.IStructuredContentProvider; |
| import org.eclipse.jface.viewers.ITreeContentProvider; |
| import org.eclipse.jface.viewers.TreeViewer; |
| import org.eclipse.jface.viewers.Viewer; |
| import org.eclipse.osee.framework.db.connection.exception.OseeCoreException; |
| import org.eclipse.osee.framework.logging.OseeLevel; |
| import org.eclipse.osee.framework.logging.OseeLog; |
| import org.eclipse.osee.framework.skynet.core.access.AccessControlManager; |
| import org.eclipse.osee.framework.skynet.core.access.PermissionEnum; |
| import org.eclipse.osee.framework.skynet.core.artifact.Artifact; |
| import org.eclipse.osee.framework.skynet.core.artifact.ArtifactChangeListener; |
| import org.eclipse.osee.framework.skynet.core.relation.CoreRelationEnumeration; |
| |
| /** |
| * The basis for the comments in this class can be found at |
| * http://www.eclipse.org/articles/treeviewer-cg/TreeViewerArticle.htm |
| * |
| * @author Ryan D. Brooks |
| */ |
| public class ArtifactContentProvider implements ITreeContentProvider, ArtifactChangeListener { |
| private static Object[] EMPTY_ARRAY = new Object[0]; |
| protected TreeViewer viewer; |
| |
| /* |
| * @see IContentProvider#dispose() |
| */ |
| public void dispose() { |
| } |
| |
| /** |
| * Notifies this content provider that the given viewer's input has been switched to a different element. |
| * <p> |
| * A typical use for this method is registering the content provider as a listener to changes on the new input (using |
| * model-specific means), and deregistering the viewer from the old input. In response to these change notifications, |
| * the content provider propagates the changes to the viewer. |
| * </p> |
| * |
| * @param viewer the viewer |
| * @param oldInput the old input element, or <code>null</code> if the viewer did not previously have an input |
| * @param newInput the new input element, or <code>null</code> if the viewer does not have an input |
| * @see IContentProvider#inputChanged(Viewer, Object, Object) |
| */ |
| public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { |
| } |
| |
| /** |
| * The tree viewer calls its content provider’s getChildren method when it needs to create or display the child |
| * elements of the domain object, <b>parent </b>. This method should answer an array of domain objects that represent |
| * the unfiltered children of <b>parent </b> |
| * |
| * @see ITreeContentProvider#getChildren(Object) |
| */ |
| @SuppressWarnings("unchecked") |
| public Object[] getChildren(Object parentElement) { |
| if (parentElement instanceof Artifact) { |
| Artifact parentItem = (Artifact) parentElement; |
| |
| try { |
| if (AccessControlManager.checkObjectPermission(parentItem, PermissionEnum.READ)) { |
| Collection<Artifact> children = parentItem.getChildren(); |
| if (children != null) { |
| return children.toArray(); |
| } |
| } |
| } catch (OseeCoreException ex) { |
| OseeLog.log(SkynetGuiPlugin.class, Level.SEVERE, ex); |
| } |
| } else if (parentElement instanceof Collection) { |
| return ((Collection) parentElement).toArray(); |
| } |
| |
| return EMPTY_ARRAY; |
| } |
| |
| /* |
| * @see ITreeContentProvider#getParent(Object) |
| */ |
| public Object getParent(Object element) { |
| if (element instanceof Artifact) { |
| try { |
| return ((Artifact) element).getParent(); |
| } catch (OseeCoreException ex) { |
| OseeLog.log(SkynetGuiPlugin.class, OseeLevel.SEVERE_POPUP, ex); |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * The tree viewer asks its content provider if the domain object represented by <b>element </b> has any children. |
| * This method is used by the tree viewer to determine whether or not a plus or minus should appear on the tree |
| * widget. |
| * |
| * @see ITreeContentProvider#hasChildren(Object) |
| */ |
| public boolean hasChildren(Object element) { |
| /* |
| * If the item is an artifact, then use it's optimized check. If it is not an artifact, then |
| * resort to asking the general children |
| */ |
| if (element instanceof Artifact) { |
| Artifact artifact = (Artifact) element; |
| try { |
| if (AccessControlManager.checkObjectPermission(artifact, PermissionEnum.READ)) { |
| if (artifact.isDeleted()) return false; |
| return artifact.getRelatedArtifactsCount(CoreRelationEnumeration.DEFAULT_HIERARCHICAL__CHILD) > 0; |
| } else { |
| return false; |
| } |
| } catch (OseeCoreException ex) { |
| OseeLog.log(SkynetGuiPlugin.class, Level.SEVERE, ex); |
| // Assume it has children if an error happens |
| return true; |
| } |
| } else { |
| return getChildren(element).length > 0; |
| } |
| } |
| |
| /** |
| * This is the method invoked by calling the <b>setInput </b> method on the tree viewer. In fact, the <b>getElements |
| * </b> method is called only in response to the tree viewer's <b>setInput </b> method and should answer with the |
| * appropriate domain objects of the inputElement. The <b>getElements </b> and <b>getChildren </b> methods operate in |
| * a similar way. Depending on your domain objects, you may have the <b>getElements </b> simply return the result of |
| * calling <b>getChildren </b>. The two methods are kept distinct because it provides a clean way to differentiate |
| * between the root domain object and all other domain objects. |
| * |
| * @see IStructuredContentProvider#getElements(Object) |
| */ |
| public Object[] getElements(Object inputElement) { |
| return getChildren(inputElement); |
| } |
| } |