1 files changed, 41 insertions, 0 deletions
diff --git a/server/src/com/vaadin/ui/UniqueSerializable.java b/server/src/com/vaadin/ui/UniqueSerializable.java
new file mode 100644
index 0000000000..789a8bb0b1
--- /dev/null
+++ b/server/src/com/vaadin/ui/UniqueSerializable.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2011 Vaadin Ltd.
+ * 
+ * Licensed 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.vaadin.ui;
+
+import java.io.Serializable;
+
+/**
+ * A base class for generating an unique object that is serializable.
+ * <p>
+ * This class is abstract but has no abstract methods to force users to create
+ * an anonymous inner class. Otherwise each instance will not be unique.
+ * 
+ * @author Vaadin Ltd
+ * @since 7.0
+ * 
+ */
+public abstract class UniqueSerializable implements Serializable {
+
+    @Override
+    public int hashCode() {
+        return getClass().hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return getClass() == obj.getClass();
+    }
+}