1 files changed, 36 insertions, 0 deletions
diff --git a/src/com/isode/stroke/base/NotNull.java b/src/com/isode/stroke/base/NotNull.java
new file mode 100644
index 0000000..f9bc87a
--- /dev/null
+++ b/src/com/isode/stroke/base/NotNull.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2012, Isode Limited, London, England.
+ * All rights reserved.
+ */
+
+package com.isode.stroke.base;
+
+/**
+ * Helper to check for nulls.
+ */
+public class NotNull {
+
+    /**
+     * Throws a NullPointerException if null.
+     * @param o Object to check for non-nullness
+     */
+    public static void exceptIfNull(Object o) {
+        if (o == null) {
+            throw new NullPointerException();
+        }
+    }
+
+    /**
+     * Throws a NullPointerException if null.
+     * @param o Object to check for non-nullness
+     * @param name Variable name to include in error.
+     */
+    public static void exceptIfNull(Object o, String name) {
+        if (name == null) {
+            throw new NullPointerException("Variable name passed to exceptIfNull must not be null");
+        }
+        if (o == null) {
+            throw new NullPointerException(name + " must not be null");
+        }
+    }
+}