Merge pull request #361 from gdgib/G2-1507-EnumMinMax

G2-1507 HEnum min & max methods
g2forge · Jan 17, 2024 · 97f5ac7 · 97f5ac7
2 parents 4140484 + 916b357
commit 97f5ac7
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diff --git a/ax-java/src/main/java/com/g2forge/alexandria/java/core/enums/HEnum.java b/ax-java/src/main/java/com/g2forge/alexandria/java/core/enums/HEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.Objects;
 
 import com.g2forge.alexandria.java.core.marker.Helpers;
 import com.g2forge.alexandria.java.function.IFunction1;
@@ -49,4 +50,28 @@ public static <E extends Enum<E>> Class<E> getEnumClass(E object) {
 		final Class<E> retVal = (Class) (((enclosing != null) && enclosing.isEnum() && enclosing.isInstance(object)) ? enclosing : klass);
 		return retVal;
 	}
+
+	@SafeVarargs
+	public static <E extends Enum<E>> E min(E... input) {
+		Objects.requireNonNull(input);
+		if (input.length < 1) throw new IllegalArgumentException();
+
+		E retVal = input[0];
+		for (int i = 1; i < input.length; i++) {
+			if (retVal.compareTo(input[i]) > 0) retVal = input[i];
+		}
+		return retVal;
+	}
+
+	@SafeVarargs
+	public static <E extends Enum<E>> E max(E... input) {
+		Objects.requireNonNull(input);
+		if (input.length < 1) throw new IllegalArgumentException();
+
+		E retVal = input[0];
+		for (int i = 1; i < input.length; i++) {
+			if (retVal.compareTo(input[i]) < 0) retVal = input[i];
+		}
+		return retVal;
+	}
 }
diff --git a/ax-java/src/test/java/com/g2forge/alexandria/java/core/enums/TestHEnum.java b/ax-java/src/test/java/com/g2forge/alexandria/java/core/enums/TestHEnum.java
@@ -49,4 +49,36 @@ public void valueOfString() {
 		} catch (IllegalArgumentException e) {}
 		Assert.assertEquals(E.C, HEnum.valueOf(E.class, Object::toString, true, IFunction1.Identity.create(), "X"));
 	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void minEmpty() {
+		HEnum.min();
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void maxEmpty() {
+		HEnum.max();
+	}
+
+	@Test
+	public void max1() {
+		Assert.assertEquals(E.A, HEnum.max(E.A));
+	}
+
+	@Test
+	public void min1() {
+		Assert.assertEquals(E.A, HEnum.min(E.A));
+	}
+
+	@Test
+	public void max2() {
+		Assert.assertEquals(E.b, HEnum.max(E.A, E.b));
+		Assert.assertEquals(E.C, HEnum.max(E.C, E.b));
+	}
+
+	@Test
+	public void min2() {
+		Assert.assertEquals(E.A, HEnum.min(E.A, E.b));
+		Assert.assertEquals(E.b, HEnum.min(E.C, E.b));
+	}
 }