com.github.loki4j.client.util.StringUtils Maven / Gradle / Ivy

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package com.github.loki4j.client.util;

import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class StringUtils {

    /**
     * Calculate the number of bytes required to store given string
     * in UTF-8 encoding.
     */
    public static int utf8Length(CharSequence input) {
        int count = 0;
        for (int i = 0, len = input.length(); i < len; i++) {
            char ch = input.charAt(i);
            if (ch <= 0x7F) {
                count++;
            } else if (ch <= 0x7FF) {
                count += 2;
            } else if (Character.isHighSurrogate(ch)) {
                count += 4;
                ++i;
            } else {
                count += 3;
            }
        }
        return count;
    }

    /**
     * Check if given String is null, empty or contains only whitespace chars.
     */
    public static boolean isBlank(CharSequence input) {
        var len = input == null
            ? 0
            : input.length();
        for (int i = 0; i < len; i++) {
            if (!Character.isWhitespace(input.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    public static String bytesAsUtf8String(byte[] input) {
        return new String(input, StandardCharsets.UTF_8);
    }

    public static String bytesAsBase64String(byte[] input) {
        return Base64.getEncoder().encodeToString(input);
    }

}