Bug 312959 [Import/Export] importing file from big disk hangs UI
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardFileSystemResourceImportPage1.java
if (path != null && relativePathVariableGroup != null) {
				IResource target = ResourcesPlugin.getWorkspace().getRoot().findMember(path);
				if (target != null && target.isVirtual())
					createVirtualFoldersButton.setSelection(true);
	    	}
			relativePathVariableGroup.setEnabled(createLinksInWorkspaceButton.getSelection());
			createVirtualFoldersButton.setEnabled(createLinksInWorkspaceButton.getSelection());
	
			if ((!selectionGroup.getAllCheckedListItems().isEmpty() && !allItemsAreChecked()) ||
				(createOnlySelectedButton.getSelection() == false)) {
	        	createVirtualFoldersButton.setSelection(true);
			}
    	}
    }
    private boolean allItemsAreChecked() {
		List checkedItems = selectionGroup.getAllCheckedListItems();
		if (!checkedItems.isEmpty()) {
			List allItems = selectionGroup.getAllListItems();
        	if (checkedItems.size() == allItems.size())
        		return true;
        }
		return false;
    }
    
    /**
     *	Answer a boolean indicating whether self's source specification
     *	widgets currently all contain valid values.
     */
    protected boolean validateSourceGroup() {
        File sourceDirectory = getSourceDirectory();