@Override
	public IStatus validateEdit(final IFile[] files, final FileModificationValidationContext context) {
		if (ClearCasePreferences.isCheckoutAutoNever())
			// FIXME: We need to inform user that Auto checkout is never
			// allowed.
			return CANCEL;
		// We are allowed to checkout file.
		System.out.println("Context is "+context.toString());
		final Shell shell = getShell(context);
		final boolean askForComment = ClearCasePreferences.isCommentCheckout() && !ClearCasePreferences.isCommentCheckoutNeverOnAuto();
		if (null == shell || !askForComment) {
			System.out.println("Shell is set to "+shell+" and askForComment is "+askForComment);
			return super.validateEdit(files, context);
		}

		try {
			this.validateEditLock.acquire();
			final IFile[] readOnlyFiles = getFilesToCheckout(files);
			if (readOnlyFiles.length == 0)
				return OK;
			final IStatus[] status = new IStatus[1];
			PlatformUI.getWorkbench().getDisplay().syncExec(new Runnable() {

				public void run() {
					status[0] = checkout(readOnlyFiles, shell);
				}
			});
			if (null == status[0])
				return CANCEL;
			return status[0];
		} finally {
			this.validateEditLock.release();
		}
	}

@Override
	public IStatus validateEdit(IFile[] files,
			FileModificationValidationContext context) {
		IFile[] readOnlyFiles = getFilesToCheckout(files);
		if (readOnlyFiles.length == 0)
			return OK;
		return checkout(readOnlyFiles);
	}