FindBugs warning: ExcelStyleDateFormatter doesn't override java.text.SimpleDAtaFormat.equals(Object)

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1717930 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/ss/usermodel/ExcelStyleDateFormatter.java

@@ -179,4 +179,14 @@ public class ExcelStyleDateFormatter extends SimpleDateFormat {
 
         return new StringBuffer(s);
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (!(o instanceof ExcelStyleDateFormatter)) {
+            return false;
+        }
+        
+        ExcelStyleDateFormatter other = (ExcelStyleDateFormatter) o;
+        return dateToBeFormatted == other.dateToBeFormatted;
+    }
 }