diff --git a/util/src/main/java/com/ning/billing/util/Either.java b/util/src/main/java/com/ning/billing/util/Either.java
new file mode 100644
index 0000000..0309e5e
--- /dev/null
+++ b/util/src/main/java/com/ning/billing/util/Either.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2010-2011 Ning, Inc.
+ *
+ * Ning licenses this file to you under the Apache License, version 2.0
+ * (the "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package com.ning.billing.util;
+
+public abstract class Either<T, V> {
+ public static <T, V> Either<T, V> left(T value) {
+ return new Left<T, V>(value);
+ }
+ public static <T, V> Either<T, V> right(V value) {
+ return new Right<T, V>(value);
+ }
+
+ private Either() {
+ }
+
+ public boolean isLeft() {
+ return false;
+ }
+ public boolean isRight() {
+ return false;
+ }
+ public T getLeft() {
+ throw new UnsupportedOperationException();
+ }
+ public V getRight() {
+ throw new UnsupportedOperationException();
+ }
+
+ public static class Left<T, V> extends Either<T, V> {
+ private final T value;
+
+ public Left(T value) {
+ this.value = value;
+ }
+ @Override
+ public boolean isLeft() {
+ return true;
+ }
+ @Override
+ public T getLeft() {
+ return value;
+ }
+ }
+
+ public static class Right<T, V> extends Either<T, V> {
+ private final V value;
+
+ public Right(V value) {
+ this.value = value;
+ }
+ @Override
+ public boolean isRight() {
+ return true;
+ }
+
+ @Override
+ public V getRight() {
+ return value;
+ }
+ }
+}
