/*
* Copyright 2010 Jon S Akhtar (Sylvanaar)
*
*   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.sylvanaar.idea.Lua.util;

/**
 * @author Maxim.Manuylov
 *         Date: 20.04.2010
 */
public class LuaStringUtil {
//    @NotNull
//    public static String getNotNull(@Nullable final String string) {
//        return string == null ? "" : string;
//    }
//
//    @NotNull
//    public static String firstLetterToUpperCase(@NotNull final String string) {
//        if (string.length() == 0) return string;
//        return Character.toUpperCase(string.charAt(0)) + string.substring(1);
//    }
//
//    @NotNull
//    public static String firstLetterToLowerCase(@NotNull final String string) {
//        if (string.length() == 0) return string;
//        return Character.toLowerCase(string.charAt(0)) + string.substring(1);
//    }
//
//    @NotNull
//    public static String changeFirstLetterCase(final String string) {
//        if (string.length() == 0) return string;
//        return changeLetterCase(string.charAt(0)) + string.substring(1);
//    }
//
//    @NotNull
//    public static String makeFirstLetterCaseTheSame(@NotNull final String string, @NotNull final String pattern) {
//        return isUpperCase(pattern.charAt(0)) ? firstLetterToUpperCase(string) : firstLetterToLowerCase(string);
//    }
//
//    private static char changeLetterCase(final char letter) {
//        return isUpperCase(letter) ? Character.toLowerCase(letter) : Character.toUpperCase(letter);
//    }
//
//    private static boolean isUpperCase(final char letter) {
//        return letter == Character.toUpperCase(letter);
//    }
//
//    public static void insert(@NotNull final StringBuilder builder, final int position,
//                              @NotNull final String textToInsert) {
//        if (position == builder.length()) {
//            builder.append(textToInsert);
//        } else {
//            builder.insert(position, textToInsert);
//        }
//    }

    static final String HEXES = "0123456789ABCDEF";

    public static String getHex(byte[] raw) {
        if (raw == null) {
            return null;
        }
        final StringBuilder hex = new StringBuilder(2 * raw.length);
        for (final byte b : raw) {
            hex.append(HEXES.charAt((b & 0xF0) >> 4)).append(HEXES.charAt((b & 0x0F)));
            hex.append(' ');
        }
        return hex.toString();
    }
}