ProjectEditorSelectionProvider.java 文件源码

/**
 * Ensures that IProject is present as first element
 * and DBPair is present as second element of the selection.
 */
private SelectionChangedEvent modifyEvent(SelectionChangedEvent event, DBPair dbPair) {
    ISelection selection = event.getSelection();
    if (selection.isEmpty()) {
        return defaultSelectionEvent;
    }
    if (!(selection instanceof IStructuredSelection)) {
        Log.log(Log.LOG_WARNING, "Cannot handle this selection type: " + selection.toString()); //$NON-NLS-1$
        // no way to deal with empty/other types of selections
        return defaultSelectionEvent;
    }

    IStructuredSelection sel = (IStructuredSelection) selection;
    List<?> elements = sel.toList();

    List<Object> newElements = new ArrayList<>(elements.size() + 2);
    newElements.add(proj);
    newElements.add(dbPair);
    newElements.addAll(elements);

    return new SelectionChangedEvent((ISelectionProvider) event.getSource(),
            new StructuredSelection(newElements));
}