X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=org.argeo.app.api%2Fsrc%2Forg%2Fargeo%2Fapp%2Fapi%2FIdRange.java;fp=org.argeo.app.api%2Fsrc%2Forg%2Fargeo%2Fapp%2Fapi%2FIdRange.java;h=d96c789b2ecba81cf0862347ae13b155a7f02c32;hb=b32a7ed960be8dbaa50e605a409c14402db5b489;hp=0000000000000000000000000000000000000000;hpb=84dffc3e1e2b16317533d13bf30d160f25ec7ced;p=gpl%2Fargeo-suite.git

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
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));
+	}
+}