Java if condition check for empty and null values

How can I write a condition in java for a webservice request, In my webservice request I am passing an element that has `SpeedInfo`. In `SpeedInfo` element there is two sub elements `Bandwidth` and `AccessSpeed`.

This is my Request In SoapUI:

         <sch:SpeedInfo>
            <ns:Bandwidth xmlns:ns="http://lpp.att.com/logical/classofservice/schema/v1">4000000</ns:Bandwidth>
            <ns:AccessSpeed xmlns:ns="http://lpp.att.com/logical/classofservice/schema/v1">4000000</ns:AccessSpeed>
         </sch:SpeedInfo>

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My Java condition:

			if (request.getSpeedInfo() == null || (request.getSpeedInfo() == null && request.getSpeedInfo().getBandwidth() == null)){
				throw new Exception(" SpeedInfo Bandwidth must be passed in the request ");
			}

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I need my condition to check for 3 scenarios:

     1. if <speedInfo> itself is not present

     2. <sch:SpeedInfo> is present, but bandwidth not present:
  
      <sch:SpeedInfo>
          <ns:AccessSpeed xmlns:ns="http://lpp.att.com/logical/classofservice/schema/v1">40000000</ns:AccessSpeed>
      </sch:SpeedInfo>

     3. Bandwidth is present but no value  
       <sch:SpeedInfo>
          <ns:Bandwidth xmlns:ns="http://lpp.att.com/logical/classofservice/schema/v1"></ns:Bandwidth>
          <ns:AccessSpeed xmlns:ns="http://lpp.att.com/logical/classofservice/schema/v1">40000000</ns:AccessSpeed>
       </sch:SpeedInfo>

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