Create new user as a POSIX account

[gpl/argeo-suite.git] / org.argeo.app.api / src / org / argeo / app / api / IdRange.java

diff --git a/org.argeo.app.api/src/org/argeo/app/api/IdRange.java b/org.argeo.app.api/src/org/argeo/app/api/IdRange.java
new file mode 100644 (file)
index 0000000..d96c789
--- /dev/null
+++ b/org.argeo.app.api/src/org/argeo/app/api/IdRange.java
@@ -0,0 +1,60 @@
+package org.argeo.app.api;
+
+/** A range of numerical IDs (typically numerical uid or gid). */
+public class IdRange {
+
+       private final long min;
+       private final long max;
+
+       public IdRange(long min, long max) {
+               this.min = min;
+               this.max = max;
+       }
+
+       public IdRange(long minPow10) {
+               this(minPow10, maxFromMinPow10(minPow10));
+       }
+
+       public long getMin() {
+               return min;
+       }
+
+       public long getMax() {
+               return max;
+       }
+
+       private static long maxFromMinPow10(long minPow10) {
+               if ((minPow10 % 100) != 0) {
+                       throw new IllegalArgumentException(minPow10 + " must at least ends with two zeroes");
+               }
+               int exp = 2;
+               exp: for (int i = exp + 1; i < 10; i++) {
+                       if ((minPow10 % pow10(i)) != 0)
+                               break exp;
+                       exp++;
+               }
+               System.out.println(exp);
+
+               long max = minPow10 + pow10(exp) - 1;
+               return max;
+       }
+
+       /** Power of 10. */
+       private static long pow10(int exp) {
+               if (exp == 0)
+                       return 1;
+               else
+                       return 10 * pow10(exp - 1);
+       }
+
+       public static void main(String... args) {
+               System.out.println(maxFromMinPow10(100));
+               System.out.println(maxFromMinPow10(78500));
+               System.out.println(maxFromMinPow10(716850000));
+
+//             System.out.println(pow10(6));
+//             System.out.println(maxFromMinPow10(12));
+//             System.out.println(maxFromMinPow10(124));
+//             System.out.println(maxFromMinPow10(99814565));
+       }
+}