com.graphqlio.uuid.helpers.UtilCommon Maven / Gradle / Ivy
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/**
* *****************************************************************************
*
* Design and Development by msg Applied Technology Research Copyright (c) 2019-2020 msg systems
* ag (http://www.msg-systems.com/) All Rights Reserved.
*
*
Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
*
The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
*
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*
****************************************************************************
*/
package com.graphqlio.uuid.helpers;
import org.apache.commons.lang.math.NumberUtils;
/**
* Common Util.
*
* @author Michael Schüfer
* @author Ahmed Amedlous
* @author Dr. Edgar Müller
*/
public class UtilCommon {
/**
* API method: import UUID from standard array of numbers.
*
* @param arr a standard array od numbers
* @return imported uuid
* @throws Exception in invalid argument
*/
public static long[] importUUID(long[] arr) throws Exception {
long[] tab = {};
// if (!(typeof arr === "object" && arr instanceof Array))
if (arr != null && arr.getClass().isArray()) {
throw new Exception("UUID: import: invalid argument (type Array expected)");
}
if (arr.length != 16) {
throw new Exception("UUID: import: invalid argument (Array of length 16 expected)");
}
for (int i = 0; i < 16; i++) {
if (!NumberUtils.isNumber(arr[i] + "")) {
throw new Exception(
"UUID: import: invalid array element #" + i + " (type Number expected)");
}
// isInfinie zu prufen
if (!(Double.isInfinite(arr[i]) && Math.floor(arr[i]) == arr[i])) {
throw new Exception(
"UUID: import: invalid array element #" + i + " (Number with integer value expected)");
}
if (!(arr[i] >= 0 && arr[i] <= 255)) {
throw new Exception(
"UUID: import: invalid array element #"
+ i
+ " (Number with integer value in range 0...255 expected)");
}
tab[i] = arr[i];
}
return tab;
}
/**
* TODO API method: compare UUID against another one.
*
* @param other the uuid to compare
* @return imported uuid
*/
public static long compareUUID(Object other) {
// Zurzeit keine Idde
// if (typeof other !== "object")
// throw new Error("UUID: compare: invalid argument (type UUID expected)");
// if (!(other instanceof UUID))
// throw new Error("UUID: compare: invalid argument (type UUID expected)");
// for (var i = 0; i < 16; i++) {
// if (this[i] < other[i]) return -1;
// else if (this[i] > other[i]) return +1;
// }
return 0;
}
/**
* API method: hash UUID by XOR-folding it k times.
*
* @param k times
* @return hash UUID by XOR-folding it k times
*/
private static long[] fond(long k) throws Exception {
if (k == 0) {
throw new Exception("UUID: fold: invalid argument (number of fold operations expected)");
}
if (k < 1 || k > 4) {
throw new Exception("UUID: fold: invalid argument (1-4 fold operations expected)");
}
int n = (int) (16 / Math.pow(2, k));
long[] hash = new long[(int) n];
for (int i = 0; i < n; i++) {
int h = 0;
// for (int j = 0; i + j < 16; j += n) h ^= this[i + j]; zu pufuen
hash[i] = h;
}
return hash;
}
}