Github user anshul1886 commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1176#discussion_r46767279
  
    --- Diff: 
plugins/hypervisors/xenserver/src/com/cloud/hypervisor/XenServerGuru.java ---
    @@ -185,7 +185,8 @@ public boolean trackVmHostChange() {
                 DataTO srcData = cpyCommand.getSrcTO();
                 DataTO destData = cpyCommand.getDestTO();
     
    -            if (srcData.getObjectType() == DataObjectType.SNAPSHOT && 
destData.getObjectType() == DataObjectType.TEMPLATE) {
    +            if (srcData.getHypervisorType() == HypervisorType.XenServer && 
srcData.getObjectType() == DataObjectType.SNAPSHOT &&
    --- End diff --
    
    @ustcweizhou @bhaisaab I prefer == to equals() method here for two reasons
    1) Enum equals() method has same code internally 
http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/lang/Enum.java#Enum.equals%28java.lang.Object%29
    
    2) This will not result in NullPointerExceptions


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