Bug 93549 [Import/Export] Disable Finish in import existing projects wizard
Build: N20050503 Open import existing project wizard Toggle radio button to import from archive Type in the name of an archive file Toggle radio button back to import from directory Observe: the Finish button is still enabled, even though there is no directory selected. Clicking Finish will import from the selected zip file.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardProjectsImportPage.java
}
	/**
	 * Answer a handle to the zip file currently specified as being the source.
	 * Return null if this file does not exist or is not of valid format.
	 */
	private TarFile getSpecifiedTarSourceFile(String fileName) {
		if (fileName.length() == 0)
			return null;
		try {
			return new TarFile(fileName);
		} catch (TarException e) {
			displayErrorDialog(DataTransferMessages.TarImport_badFormat);
		} catch (IOException e) {
			displayErrorDialog(DataTransferMessages.ZipImport_couldNotRead);
		}
		archivePathField.setFocus();
		return null;
	}
	/**
	 * Display an error dialog with the specified message.
	 * 
	 * @param message
	 *            the error message
	 */
	protected void displayErrorDialog(String message) {
		MessageDialog.openError(getContainer().getShell(),
				getErrorDialogTitle(), message); 
	}
	/**
	 * Get the title for an error dialog. Subclasses should override.