Business Components Objects in Groovy Expressions

Oracle allowing Groovy expressions to be used in attribute validation and as a source for attribute values.


Entity Object Attribute and Raise error Groovy

The validation provides implicit object to access information contained within. Two of these information is oldValue and newValue, which gives you a handle to the value as it was before and after update.
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If you want to raise a error message for high salary and low salary then you can use single validation to raise these error messages.

EX: in Create a attribute level script validation in the EO.

if(newValue > 10000)
{
      adf.error.raise("EMPLOYEE_SALARY_IS_TOO_HIGH")
      return false
}
if(newValue < 999)
{
      adf.error.raise("EMPLOYEE_SALARY_IS_TOO_LOW")
      return false
}

return true

Create these "EMPLOYEE_SALARY_IS_TOO_HIGH" and "EMPLOYEE_SALARY_IS_TOO_LOW" in the resource bundle.

Note: if you want raise a warning message use "adf.error.warn()".

Referencing custom methods in the EntityImpl class

If you have defined a method in your EntityImpl class, then this can be called as part of your expression for an attribute default:

adf.object.<your_custom_method>

Unlike when referencing an attribute of the entity object, which can be done by simply

referencing the attribute name, when referencing a method, you are required to prefix the method name with
adf.object

If you want to reference the same method from a validator, you have to use the source prefix.
source.<your_custom_method>

To access the next sequence value  adf.object.nextVal("YOUR_SEQUENCE_NAME");

Of course, in practice you might create an EntityImpl helper method:
    protected oracle.jbo.domain.Number nextVal(String sequenceName) {
        SequenceImpl s = new SequenceImpl(sequenceName, getDBTransaction());
        return s.getSequenceNumber();
    }
-OR-
(new  oracle.jbo.server.SequenceImpl("EMPLOYEES_SEQ",adf.object.getDBTransaction())).getSequenceNumber()

To access the Attribute Labels adf.object.hints.LastName.label
Access Session

adf.context.current.sessionScope.get('test')

ADFContext.getCurrent().getSessionScope().get("test");

Date and time

To access the current date and time adf.currentDate and adf.currentDateTime 

Security Context

To get the username from security context adf.context.securityContext.userName

Groovy Expressions White Paper and Sample Code.