Part1 - Hiding Unwanted Operators in Advanced mode of af:query Component

Oracle ADF helps you to build af:query component declaratively by dropping view criteria defined in a view object on to a page. While building view criteria you can create custom operators or remove built-in operators (displayed in advanced mode of af:query component) for each view criteria item by adding <CompOper/> to the view object XML file. Note that you may need to do it manually, there is no editor support for the same. This concept is explained in developers guide under the topic - How to Create Custom Operators or Remove Standard Operators.

The attributes used in <CompOper/> as as follows:

• Name: Specify an id for the operation.
• ToDo: Set to 1 to add this custom operator. Set to -1 to remove an operator.
• OperDescStrCode: Specify the id used in the message bundle to map to the description string.
• Oper: Set to a value that will be used programmatically to denote this operation in the SQL statement. 
• MinCardinality: If there is an input range, set this property to the minimum value for the range. For example, if the range is months in a year, this value should be set to 1. If there is no range, set it to 0.
• MaxCardinality: If there is an input range, set this property to the maximum value for the range. For example, if the range is months in a year, this value should be set to 12. If there is no range, set it to 0.
• TransientExpression: Set the expression to perform the custom operator function. 

In the following example operators BETWEEN and NOTBETWEEN are removed for 'Email' ViewCriteriaItem in the advanced mode of af:query component.

  <ViewCriteria  
     Name="EmployeesViewCriteria"  
     ViewObjectName="model.EmployeesView"  
     Conjunction="AND">  
     <Properties>  
       <CustomProperties>  
         <Property  
           Name="displayOperators"  
           Value="InAdvancedMode"/>  
         <Property  
           Name="autoExecute"  
           Value="false"/>  
         <Property  
           Name="allowConjunctionOverride"  
           Value="true"/>  
         <Property  
           Name="showInList"  
           Value="true"/>  
         <Property  
           Name="mode"  
           Value="Basic"/>  
       </CustomProperties>  
     </Properties>  
     <ViewCriteriaRow  
       Name="EmployeesViewCriteria_row_0"  
       UpperColumns="1">  
       <ViewCriteriaItem  
         Name="Email"  
         ViewAttribute="Email"  
         Operator="="  
         Conjunction="AND"  
         Required="Optional">  
         <CompOper  
           Name="Name"  
           Oper="BETWEEN"  
           ToDo="-1"  
           MinCardinality="0"  
           MaxCardinality="0"/>  
         <CompOper  
           Name="Name"  
           Oper="NOTBETWEEN"  
           ToDo="-1"  
           MinCardinality="0"  
           MaxCardinality="0"/>  
       </ViewCriteriaItem>  
       <ViewCriteriaItem  
         Name="EmployeesViewCriteria_EmployeesViewCriteria_row_0_DepartmentId"  
         ViewAttribute="DepartmentId"  
         Operator="="  
         Conjunction="AND"  
         Required="Optional"/>  
     </ViewCriteriaRow>  
 </ViewCriteria>  

Learn More ...

There are a lot more points like this. If  you are curious to learn the internals of the ADF Business Components and ADF Binding Layer,  the following book is for you - Oracle ADF Real World Developer’s Guide.
More details about this book can be found in this post- http://jobinesh.blogspot.in/2012/07/pre-order-your-copy-of-oracle-adf-real.html