从中获取列值ice:数据表另一列的验证程序

我的ice:dataTable外观就像下图:-

<ice:dataTable id="someTbl" var="someVar" value="#{someBean.someList}" >
   <ice:column>  
       <f:facet name="header"> <ice:outputText value="#{msgs.tblCol1}"> </f:facet>
       <ice:outputText value="#{someVar.name}"/>
    </ice:column>
   <ice:column>  
       <f:facet name="header"> <ice:outputText value="#{msgs.tblCol2}"> </f:facet>
        <ice:selectInputDate id="startCal" value="#{someVar.startTime}"
                 renderAsPopup="true" renderYearAsDropdown="true"    
                 renderMonthAsDropdown="true" partialSubmit="true" >
                 <f:convertDateTime pattern="MM/dd/yyyy HH:mm" type="date" timeZone="EST"/> 
        </ice:selectInputDate>
    </ice:column>
    <ice:column>  
       <f:facet name="header"> <ice:outputText value="#{msgs.tblCol3}"> </f:facet>
        <ice:selectInputDate id="endCal" value="#{someVar.endTime}"
                 renderAsPopup="true" renderYearAsDropdown="true"    
                 renderMonthAsDropdown="true" partialSubmit="true" validator="#{someBean.validateEndtime}">
                 <f:convertDateTime pattern="MM/dd/yyyy HH:mm" type="date" timeZone="EST"/> 
        </ice:selectInputDate>
    </ice:column>
</ice:dataTable> 

当调用行上第二个日历(id“endCal”)上的验证器时,我想在我的backingbean中获取该行上第一个日历(id“startCal”)的值。有没有办法做到这一点?我在想冰:但是我注意到我只能得到所选对象的rowId,这意味着我必须遍历“someBean.someList在验证程序方法中查找该项的值。