/*
 * Copyright (C) 2012 Google Inc.
 *
 * 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 com.googlecode.eyesfree.braille.translate;

/**
 * Translates from text to braille and the other way according to a
 * particular translation table.
 */
public interface BrailleTranslator {
    /**
     * Translates a string into the corresponding dot patterns and returns the
     * resulting byte array.  Returns {@code null} on error.
     */
    byte[] translate(String text);

    /**
     * Translates the braille {@code cells} into the corresponding text, which
     * is returned.  Returns {@code null} on error.
     */
    String backTranslate(byte[] cells);
}