+ * To use this class all you need to do is call super.createPartControl in your + * own createPartControl implementation. This will make sure a {@link Graph} + * will be available directly after that for initializing the UI and its + * contents. + *
+ * + *+ * To open a ResourceInputViewPart use: + * {@link ResourceViewPartUtils#activateViewForResource(String, org.simantics.db.Session, Resource)} + * which should give the view the specified resource id as its secondary id. + *
+ * + * @author Tuukka Lehtonen + */ +public abstract class ResourceInputViewPart extends GraphAccessViewPart { + + private static final String NO_NAME = "(no name)"; + + private static final String MULTIPLE_NAMES = "(multiple names)"; + + + private ResourceInput mainInput; + + private Resource inputResource; + + private String inputName = NO_NAME; + + + //---------------------------------------------------------------------- + // Getters + + public Resource getInputResource() { + return inputResource; + } + + public String getInputName() { + return inputName; + } + + + //---------------------------------------------------------------------- + // Event handlers & initialization + + /** + * Must be called after initializeGraph. + */ + private void initializeInput() { + // Get the main input from the view's secondary ID. + String secondaryId = getViewSite().getSecondaryId(); + if (secondaryId == null) + // No input given! + return; + + mainInput = ResourceInput.unmarshall(secondaryId); + try { + inputResource = mainInput.toResource(getSession()); + } catch (DatabaseException e) { + ErrorLogger.defaultLogError(e); + } + } + + + /** + * Initializes graph data access and view resource ID input structures. + * + *+ * This method is automatically called by + * {@link #createPartControl(Composite)}. Override to perform own + * graph-related initializations but be absolutely sure to call super the + * first thing. Clients must not directly call this method. + *
+ */ + @Override + protected void initialize() { + super.initialize(); + initializeInput(); + } + + /** + * @returntrue if the input resource still exists, i.e.
+ * there are triples with the subject of the input resource.
+ */
+ protected boolean inputExists(ReadGraph g) throws DatabaseException {
+ if (inputResource == null)
+ return false;
+ return g.hasStatement(inputResource);
+ }
+
+ @Override
+ protected void cleanup() {
+ inputResource = null;
+ super.cleanup();
+ }
+
+
+ /**
+ * @return the main input structure of this view which identifies a single
+ * input resource
+ */
+ public ResourceInput getMainInput() {
+ return mainInput;
+ }
+
+
+ //----------------------------------------------------------------------
+ // Override these if necessary:
+
+ @Override
+ protected String getTitleText() {
+ return getInputName();
+ }
+
+ @Override
+ protected String getTitleTooltip() {
+ return getInputName();
+ }
+
+
+ /**
+ * Extends {@link #update(GraphChangeEvent)} to handle disappearing inputs
+ * by hiding the view.
+ *
+ * @param event
+ * the received change event
+ */
+ @Override
+ protected void update(ChangeEvent event) throws DatabaseException {
+ ReadGraph g = event.getGraph();
+
+ // If the input no longer exists, the editor should be closed since the
+ // situation is analogous to having an IEditorPart input, such as a
+ // file, deleted suddenly.
+ if (!inputExists(g)) {
+ WorkbenchUtils.hideView(getViewSite().getWorkbenchWindow(), this);
+ return;
+ }
+
+ updateModelCache(g);
+ reload(g);
+ }
+
+ private void updateModelCache(ReadGraph graph) {
+ try {
+ Layer0 L0 = Layer0.getInstance(graph);
+ inputName = graph.getPossibleRelatedValue(inputResource, L0.HasName);
+ if (inputName == null)
+ inputName = NO_NAME;
+ } catch (DatabaseException e) {
+ inputName = MULTIPLE_NAMES;
+ }
+ }
+
+}