Made Table serializable when using column width for row header (#8428)

svn changeset:23834/svn branch:6.8

2 files changed, 37 insertions, 1 deletions

diff --git a/src/com/vaadin/ui/Table.java b/src/com/vaadin/ui/Table.java
index a2db89cabb..564aa24991 100644
--- a/src/com/vaadin/ui/Table.java
+++ b/src/com/vaadin/ui/Table.java
@@ -205,7 +205,8 @@ public class Table extends AbstractSelect implements Action.Container,
     private static final double CACHE_RATE_DEFAULT = 2;
 
     private static final String ROW_HEADER_COLUMN_KEY = "0";
-    private static final Object ROW_HEADER_FAKE_PROPERTY_ID = new Object();
+    private static final Object ROW_HEADER_FAKE_PROPERTY_ID = new UniqueSerializable() {
+    };
 
     /* Private table extensions to Select */
 
diff --git a/src/com/vaadin/ui/UniqueSerializable.java b/src/com/vaadin/ui/UniqueSerializable.java
new file mode 100644
index 0000000000..f6f354ef58
--- /dev/null
+++ b/src/com/vaadin/ui/UniqueSerializable.java
@@ -0,0 +1,35 @@
+/*
+@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 {
+
+    public static UniqueSerializable create() {
+        return new UniqueSerializable() {
+        };
+    }
+
+    @Override
+    public int hashCode() {
+        return getClass().hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return getClass() == obj.getClass();
+    }
+}