Nil: enable type-safe wrapping of raw types

ctrueden · gselzer · commit c22dc55c74d1 · 2019-11-25T16:48:33.000-06:00
diff --git a/src/main/java/org/scijava/ops/types/Nil.java b/src/main/java/org/scijava/ops/types/Nil.java
@@ -95,6 +95,18 @@ public Nil(final Object callbacks) {
 		this.callbacks = callbacks(callbacks);
 	}
 
+	/**
+	 * Creates a {@code Nil} wrapping the given raw {@link Class}.
+	 * <p>
+	 * This method is intentionally private; use {@link Nil#of(Class)} to create
+	 * such a {@code Nil} from calling code.
+	 * </p>
+	 */
+	private Nil(final Class<T> rawType) {
+		typeToken = TypeToken.of(rawType);
+		callbacks = this;
+	}
+
 	/**
 	 * Creates a {@code Nil} wrapping the given generic {@link Type}.
 	 * <p>
@@ -122,6 +134,10 @@ private Nil(final Type type, final Object callbacks) {
 
 	// -- Static utility methods --
 
+	public static <T> Nil<T> of(final Class<T> rawType) {
+		return new Nil<T>(rawType) {};
+	}
+
 	/**
 	 * Creates a {@code Nil} of the given generic {@link Type}, with no extra
 	 * method callbacks.
