/*
 * FreeOTP
 *
 * Authors: Nathaniel McCallum <npmccallum@redhat.com>
 *
 * Copyright (C) 2013  Nathaniel McCallum, Red Hat
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.fedorahosted.freeotp;

import android.app.AlertDialog;
import android.text.Editable;

public class ManualSecretTextWatcher extends ManualTextWatcher {
	public ManualSecretTextWatcher(AlertDialog dialog) {
		super(dialog);
	}

	@Override
	public void afterTextChanged(Editable s) {
		if (s.length() != 0) {
			// Ensure that = is only permitted at the end
			boolean haveData = false;
			for (int i = s.length() - 1; i >= 0; i--) {
				char c = s.charAt(i);
				if (c != '=')
					haveData = true;
				else if (haveData)
					s.delete(i, i + 1);
			}
		}

		super.afterTextChanged(s);
	}
}