EDT:EGL Language Part Types

Please see the parent of this page, EDT:EGL Language.

Part Types (Table 1)

Part Types	Core	JavaScript	Java
DataItem1	2d	JS: DataItem2d	2d
Function2, 5	done	JS: Function overloading4d	done
Stand-alone function2, 5	done	JS:Stand-alone functions 1d	1d
Delegate2	done	done	done bug 353641
Record6	done	done	done
Structured Record6	5d	N/S	N/S
ExternalType	done	done	done
Handler	done bug 353769	done	done bug 353642
Library	done	done	done
Service	done bug 353769	1d	done bug 353643
Interface3	done	1d	done bug 353644
Enumeration	1d	done	done bug 353645
Program4	done	N/S	done bug 353646
List (was "Array")	done	done	done
Deployment Descriptor7	done	RUIhandlers	REST RPC SOAP
DataTable	done	N/S	N/S
Form	1d	N/S	N/S
FormGroup	2d	N/S	N/S

Notes on Table 1

1. In RBD a DataItem can only be used for primitive types. In EDT it can be used for any type.
2. See also Table 2: Function Parameters.
3. Interfaces can be implemented by services and handlers (every kind of "logic part" which can be instantiated).
4. There are no called programs in EDT. Use libraries for "local calls" and services for "remote calls".
5. We intend to support function overloading in all implementations, even JavaScript.
6. Records (including structured records) are value types, so record variables may be declared with a question mark following the name of the type to indicate that they're nullable. Nullability means that a variable may really be null. It's not an "I'm null" flag like in RBD. A NullValueException will be thrown if you try to access a field or function of a null variable, even a record. A NullValueException will be thrown if a null variable is an operand to a math operator, a list (array) access, a substring access, a comparison, or a bitwise operator. The string concatenation operators will work the same as in RBD with respect to nulls.  :: treats null as the empty string, and ?: results in null if either operand is null. A question mark won't be allowed on the second operand of the AS and ISA operators (the name of the type).
7. The deployment descriptor will ONLY be used for deployment. Neither the Java or JavaScript generator will generate the deployment descriptor.