From 5de7b39c8b46d2a425d72fa7629e53199138d5cd Mon Sep 17 00:00:00 2001
From: LO Kam Tao Leo <leolo@leolo.org>
Date: Wed, 2 Nov 2022 11:36:37 +0000
Subject: [PATCH] Add a helper class

---
 src/main/java/org/leolo/nrdatad/util/Range.java    | 25 ++++++++++++++++++++++
 .../java/org/leolo/nrdatad/util/RangeTest.java     | 20 +++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 src/main/java/org/leolo/nrdatad/util/Range.java
 create mode 100644 src/test/java/org/leolo/nrdatad/util/RangeTest.java

diff --git a/src/main/java/org/leolo/nrdatad/util/Range.java b/src/main/java/org/leolo/nrdatad/util/Range.java
new file mode 100644
index 0000000..1aaa728
--- /dev/null
+++ b/src/main/java/org/leolo/nrdatad/util/Range.java
@@ -0,0 +1,25 @@
+package org.leolo.nrdatad.util;
+
+public class Range<E extends Comparable> {
+
+    private E lowerBound;
+    private E upperBound;
+
+    public Range(E bound1, E bound2){
+        if(bound1.compareTo(bound2)==-1){
+            lowerBound = bound1;
+            upperBound = bound2;
+        }else{
+            lowerBound = bound2;
+            upperBound = bound1;
+        }
+    }
+
+    public E getLowerBound() {
+        return lowerBound;
+    }
+
+    public E getUpperBound() {
+        return upperBound;
+    }
+}
diff --git a/src/test/java/org/leolo/nrdatad/util/RangeTest.java b/src/test/java/org/leolo/nrdatad/util/RangeTest.java
new file mode 100644
index 0000000..5a568e9
--- /dev/null
+++ b/src/test/java/org/leolo/nrdatad/util/RangeTest.java
@@ -0,0 +1,20 @@
+package org.leolo.nrdatad.util;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+public class RangeTest {
+
+    @Test
+    public void basicInteger1(){
+        Range<Integer> range = new Range<>(1,2);
+        assertEquals(1, range.getLowerBound().intValue());
+        assertEquals(2, range.getUpperBound().intValue());
+        range = new Range<>(2,1);
+        assertEquals(1, range.getLowerBound().intValue());
+        assertEquals(2, range.getUpperBound().intValue());
+        range = new Range<>(2,2);
+        assertEquals(2, range.getLowerBound().intValue());
+        assertEquals(2, range.getUpperBound().intValue());
+    }
+}