Moving to source sets

src/main/java/appeng/util/EnumCycler.java

@@ -0,0 +1,62 @@
+package appeng.util;
+
+import java.util.EnumSet;
+
+/**
+ * Simple utility class to help with select the "next" or "previous" value in a
+ * list of options represented by an enumeration.
+ */
+public final class EnumCycler {
+
+    private EnumCycler() {
+    }
+
+    public static <T extends Enum<T>> T rotateEnum(T ce, final boolean backwards, final EnumSet<T> validOptions) {
+        do {
+            if (backwards) {
+                ce = prevEnum(ce);
+            } else {
+                ce = next(ce);
+            }
+        } while (!validOptions.contains(ce));
+
+        return ce;
+    }
+
+    /*
+     * Simple way to cycle an enum...
+     */
+    public static <T extends Enum<T>> T prevEnum(final T ce) {
+        T[] values = ce.getDeclaringClass().getEnumConstants();
+
+        int pLoc = ce.ordinal() - 1;
+        if (pLoc < 0) {
+            pLoc = values.length - 1;
+        }
+
+        if (pLoc < 0 || pLoc >= values.length) {
+            pLoc = 0;
+        }
+
+        return values[pLoc];
+    }
+
+    /*
+     * Simple way to cycle an enum...
+     */
+    public static <T extends Enum<T>> T next(final T ce) {
+        T[] values = ce.getDeclaringClass().getEnumConstants();
+
+        int pLoc = ce.ordinal() + 1;
+        if (pLoc >= values.length) {
+            pLoc = 0;
+        }
+
+        if (pLoc < 0 || pLoc >= values.length) {
+            pLoc = 0;
+        }
+
+        return values[pLoc];
+    }
+
+}