Merge branch 'master' into gwt

1 files changed, 30 insertions, 0 deletions

diff --git a/src/com/vaadin/ui/UniqueSerializable.java b/src/com/vaadin/ui/UniqueSerializable.java
new file mode 100644
index 0000000000..828b285538
--- /dev/null
+++ b/src/com/vaadin/ui/UniqueSerializable.java
@@ -0,0 +1,30 @@
+/*
+@VaadinApache2LicenseForJavaFiles@
+ */
+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
+ * @version @VERSION@
+ * @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();
+    }
+}