/** Handler for tree selection. */
void handleTreeSelection() {
IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
ElementSymbol element = null;
if (!selection.isEmpty()) {
ICriteriaStrategy strategy = ElementViewerFactory.getCriteriaStrategy(viewer);
strategy.setTreeViewer(viewer); // make sure this viewer is set before using strategy
if (strategy.isValid(selection.getFirstElement())) {
Object eObj = selection.getFirstElement();
if (eObj instanceof ElementSymbol) {
element = ((ElementSymbol) eObj);
} else {
element = new ElementSymbol(strategy.getRuntimeFullName(eObj), true);
// the viewer model contains EObjects. so the objects in the selection will
// be EObjects. since the EObject is used later on in the QueryCriteriaStrategy.getNode()
// method. save it here.
element.setMetadataID(eObj);
}
}
}
model.selectElementSymbol(element);
}
/** Displays the appropriate UI for the current model state. */
void displayElementSymbol() {
CoreArgCheck.isNotNull(viewer);
StructuredSelection selection = StructuredSelection.EMPTY;
if (model.getElementSymbol() != null) {
strategy.setTreeViewer(viewer); // make sure this viewer is set before using strategy
Object node = strategy.getNode(model.getElementSymbol());
if (node != null) {
selection = new StructuredSelection(node);
}
if (!selection.equals(viewer.getSelection())) {
viewer.setSelection(selection);
}
}
}
/**
* Constructs a <code>ElementEditor</code> using the given model.
*
* @param theParent the parent container
* @param theModel the editor's model
* @throws IllegalArgumentException if any of the parameters are <code>null</code>
*/
public ElementEditor(Composite theParent, ElementEditorModel theModel) {
super(theParent, ElementSymbol.class, theModel);
controller = new ViewController();
model = theModel;
model.addModelListener(controller);
// set the viewer on the CriteriaStrategy
strategy = ElementViewerFactory.getCriteriaStrategy(viewer);
strategy.setTreeViewer(viewer);
}
/**
* @see
* com.metamatrix.modeler.transformation.ui.builder.ILanguageObjectEditor#setLanguageObject(com.metamatrix.query.sql.LanguageObject)
*/
@Override
public void setLanguageObject(LanguageObject theLanguageObject) {
if (theLanguageObject == null) {
clear();
} else {
if (!(theLanguageObject instanceof ElementSymbol)) {
CoreArgCheck.isTrue(
(theLanguageObject instanceof ElementSymbol),
Util.getString(
PREFIX + "invalidLanguageObject", // $NON-NLS-1$
new Object[] {theLanguageObject.getClass().getName()}));
}
model.setLanguageObject(theLanguageObject);
}
}
