/********************************************************************************************************
 * @file Strings.java
 *
 * @brief for TLSR chips
 *
 * @author telink
 * @date     Sep. 30, 2017
 *
 * @par     Copyright (c) 2017, Telink Semiconductor (Shanghai) Co., Ltd. ("TELINK")
 *
 *          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.telink.ble.mesh.util;

import java.nio.charset.Charset;

public final class Strings {

    private Strings() {
    }

    public static byte[] stringToBytes(String str, int length) {

        byte[] srcBytes;

        if (length <= 0) {
            return str.getBytes(Charset.defaultCharset());
        }

        byte[] result = new byte[length];

        srcBytes = str.getBytes(Charset.defaultCharset());

        if (srcBytes.length <= length) {
            System.arraycopy(srcBytes, 0, result, 0, srcBytes.length);
        } else {
            System.arraycopy(srcBytes, 0, result, 0, length);
        }

        return result;
    }

    public static byte[] stringToBytes(String str) {
        return stringToBytes(str, 0);
    }

    public static String bytesToString(byte[] data) {
        return data == null || data.length <= 0 ? null : new String(data, Charset.defaultCharset()).trim();
    }

    public static boolean isEmpty(String str) {
        return str == null || str.trim().isEmpty();
    }
}