Merge pull request #127 from tynanford/range_infinity

Address issue #56 - permit half-ranges

Author: shroffk

epics-util/src/main/java/org/epics/util/stats/Range.java

@@ -213,10 +213,16 @@ public int hashCode() {
      * @return the range
      */
     public static Range of(final double minValue, final double maxValue) {
-        if (Double.isNaN(minValue) || Double.isNaN(maxValue)) {
+        if (Double.isNaN(minValue) && Double.isNaN(maxValue)) {
             return Range.UNDEFINED;
         }
-        
+        else if (Double.isNaN(minValue)) {
+            return new Range(Double.NEGATIVE_INFINITY, maxValue, false);
+        }
+        else if (Double.isNaN(maxValue)) {
+            return new Range(minValue, Double.POSITIVE_INFINITY, false);
+        }
+
         if (minValue > maxValue) {
             return new Range(maxValue, minValue, true);
         }

epics-util/src/test/java/org/epics/util/stats/RangeTest.java

@@ -44,7 +44,10 @@ public void range3() throws Exception {
     @Test
     public void range4() throws Exception {
         Range range = Range.of(0.0, Double.NaN);
-        assertThat(range, sameInstance(Range.undefined()));
+        assertThat(range.getMinimum(), equalTo(0.0));
+        assertThat(range.getMaximum(), equalTo(Double.POSITIVE_INFINITY));
+        assertThat(range.isReversed(), equalTo(false));
+        assertThat(range.toString(), equalTo("[0.0 - Infinity]"));
     }
 
     @Test