public static HashCode fromString(final String string) {
Preconditions.checkArgument(
string.length() >= 2, "input string (%s) must have at least 2 characters", string);
Preconditions.checkArgument(
string.length() % 2 == 0,
"input string (%s) must have an even number of characters",
string);
final byte[] bytes = new byte[string.length() / 2];
for (int i = 0; i < string.length(); i += 2) {
final int ch1 = decode(string.charAt(i)) << 4;
final int ch2 = decode(string.charAt(i + 1));
bytes[i / 2] = (byte) (ch1 + ch2);
}
return fromBytesNoCopy(bytes);
}
@Override
public long asLong() {
Preconditions.checkState(
this.bytes.length >= 8,
"HashCode#asLong() requires >= 8 bytes (it only has %s bytes).",
this.bytes.length);
return this.padToLong();
}
@Override
public int asInt() {
Preconditions.checkState(
this.bytes.length >= 4,
"HashCode#asInt() requires >= 4 bytes (it only has %s bytes).",
this.bytes.length);
return (this.bytes[0] & 0xFF)
| (this.bytes[1] & 0xFF) << 8
| (this.bytes[2] & 0xFF) << 16
| (this.bytes[3] & 0xFF) << 24;
}
public static HashCode fromBytes(final byte[] bytes) {
Preconditions.checkArgument(
bytes.length >= 1, (Object) "A HashCode must contain at least 1 byte.");
return fromBytesNoCopy(bytes.clone());
}
public int writeBytesTo(final byte[] dest, final int offset, int maxLength) {
maxLength = Ints.min(maxLength, this.bits() / 8);
Preconditions.checkPositionIndexes(offset, offset + maxLength, dest.length);
this.writeBytesToImpl(dest, offset, maxLength);
return maxLength;
}
BytesHashCode(final byte[] bytes) {
this.bytes = Preconditions.checkNotNull(bytes);
}