public static String maskString(
String toMasking, char maskChr, StringMaskOption maskOpt, int maskPercent) {
if (toMasking == null) {
return null;
}
if (maskPercent <= 0) {
return toMasking;
}
StringBuilder sb = new StringBuilder(toMasking.length());
if (maskPercent >= 100) {
for (int i = 0; i < toMasking.length(); i++) {
sb.append(maskChr);
}
return sb.toString();
}
final int maskLen = (toMasking.length() * maskPercent) / 100;
int maskCountdown = maskLen;
int maskStart = 0;
switch (maskOpt) {
case MASK_HEAD:
{
maskStart = 0;
break;
}
case MASK_END:
{
maskStart = toMasking.length() - maskLen;
break;
}
case MASK_MIDDLE:
{
maskStart = (toMasking.length() / 2) - maskLen / 2;
break;
}
}
for (int i = 0; i < toMasking.length(); i++) {
if (i >= maskStart && i <= maskStart + maskLen) {
while (maskCountdown-- != 0) {
sb.append(maskChr);
}
i += maskLen;
continue;
}
sb.append(toMasking.charAt(i));
}
return sb.toString();
}
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)));
return hex.toString();
}