io.questdb.std.Uuid Maven / Gradle / Ivy
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* ___ _ ____ ____
* / _ \ _ _ ___ ___| |_| _ \| __ )
* | | | | | | |/ _ \/ __| __| | | | _ \
* | |_| | |_| | __/\__ \ |_| |_| | |_) |
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*
* Copyright (c) 2014-2019 Appsicle
* Copyright (c) 2019-2023 QuestDB
*
* 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 io.questdb.std;
import io.questdb.std.str.CharSinkBase;
import io.questdb.std.str.Sinkable;
import io.questdb.std.str.Utf8Sequence;
import org.jetbrains.annotations.NotNull;
public final class Uuid implements Sinkable {
public static final int FIRST_DASH_POS = 8;
public static final int FOURTH_DASH_POS = 23;
public static final int SECOND_DASH_POS = 13;
public static final int THIRD_DASH_POS = 18;
public static final int UUID_LENGTH = 36;
private long hi = Numbers.LONG_NaN;
private long lo = Numbers.LONG_NaN;
public Uuid(long lo, long hi) {
of(lo, hi);
}
public Uuid() {
}
/**
* Check UUID string has the right length and dashes in the right places.
* It does not perform full validation of the UUID string.
* Call this method before calling {@link #parseHi(CharSequence)} or {@link #parseLo(CharSequence)}.
*
* @param uuid UUID string
* @throws NumericException if UUID string has wrong length or dashes in wrong places
*/
public static void checkDashesAndLength(CharSequence uuid) throws NumericException {
checkDashesAndLength(uuid, 0, uuid.length());
}
public static void checkDashesAndLength(CharSequence uuid, int lo, int hi) throws NumericException {
if (lo < 0 || hi < lo || hi > uuid.length()) {
throw NumericException.INSTANCE;
}
if (hi - lo != UUID_LENGTH) {
throw NumericException.INSTANCE;
}
if (uuid.charAt(lo + FIRST_DASH_POS) != '-'
|| uuid.charAt(lo + SECOND_DASH_POS) != '-'
|| uuid.charAt(lo + THIRD_DASH_POS) != '-'
|| uuid.charAt(lo + FOURTH_DASH_POS) != '-') {
throw NumericException.INSTANCE;
}
}
/**
* Check if UUID is null.
*
* @param lo low 64 bits of UUID
* @param hi high 64 bits of UUID
* @return true if UUID is null
*/
public static boolean isNull(long lo, long hi) {
return hi == Numbers.LONG_NaN && lo == Numbers.LONG_NaN;
}
/**
* Returns highest 64 bits of UUID.
*
* This method assumes that UUID has correct length and dashes in correct positions
* Use {@link #checkDashesAndLength(CharSequence)} to validate that before calling this method.
*
* Returned bits are in little-endian order.
*
* @param uuid uuid string
* @return high UUID bits
* @throws NumericException if UUID is not valid
*/
public static long parseHi(CharSequence uuid) throws NumericException {
return parseHi(uuid, 0);
}
public static long parseHi(CharSequence uuid, int lo) throws NumericException {
assert lo >= 0;
long hi1;
long hi2;
long hi3;
hi1 = Numbers.parseHexLong(uuid, lo, lo + FIRST_DASH_POS);
hi2 = Numbers.parseHexLong(uuid, lo + FIRST_DASH_POS + 1, lo + SECOND_DASH_POS);
hi3 = Numbers.parseHexLong(uuid, lo + SECOND_DASH_POS + 1, lo + THIRD_DASH_POS);
return (hi1 << 32) | (hi2 << 16) | hi3;
}
/**
* Returns lowest 64 bits of UUID.
*
* This method assumes that UUID has correct length and dashes in correct positions
* Use {@link #checkDashesAndLength(CharSequence)} to validate that before calling this method.
*
* Returned bits are in little-endian order.
*
* @param uuid uuid string
* @return low UUID bits
* @throws NumericException if UUID is not valid
*/
public static long parseLo(CharSequence uuid) throws NumericException {
return parseLo(uuid, 0);
}
public static long parseLo(CharSequence uuid, int lo) throws NumericException {
assert lo >= 0;
long lo1;
long lo2;
lo1 = Numbers.parseHexLong(uuid, lo + THIRD_DASH_POS + 1, lo + FOURTH_DASH_POS);
lo2 = Numbers.parseHexLong(uuid, lo + FOURTH_DASH_POS + 1, lo + UUID_LENGTH);
return (lo1 << 48) | lo2;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || o.getClass() != Uuid.class) {
return false;
}
Uuid that = (Uuid) o;
return lo == that.lo && hi == that.hi;
}
public long getHi() {
return hi;
}
public long getLo() {
return lo;
}
@Override
public int hashCode() {
return Hash.hashLong128(lo, hi);
}
public void of(long lo, long hi) {
this.lo = lo;
this.hi = hi;
}
public void of(@NotNull CharSequence uuid) throws NumericException {
checkDashesAndLength(uuid);
this.lo = parseLo(uuid);
this.hi = parseHi(uuid);
}
public void of(@NotNull Utf8Sequence uuid) throws NumericException {
CharSequence csView = uuid.asAsciiCharSequence();
checkDashesAndLength(csView);
this.lo = parseLo(csView);
this.hi = parseHi(csView);
}
public void of(@NotNull CharSequence uuid, int lo, int hi) throws NumericException {
checkDashesAndLength(uuid, lo, hi);
this.lo = parseLo(uuid, lo);
this.hi = parseHi(uuid, lo);
}
public void ofNull() {
this.lo = Numbers.LONG_NaN;
this.hi = Numbers.LONG_NaN;
}
@Override
public void toSink(@NotNull CharSinkBase sink) {
Numbers.appendUuid(lo, hi, sink);
}
}