ITT Rule IDL Version 7.0 User Manual download pdf (Page 163)

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Chapter 7: Creating an Operation 163

iTool Developer’s Guide Creating a New Data-Centric Operation

property value, either by storing the value directly in the operation object’s instance

data or by calling another class’ SetProperty method.

Note

Any property registered with a call to the RegisterProperty method must be listed as

a keyword to the SetProperty method either of the operation class or one of its

superclasses.

See “IDLitDataOperation::SetProperty” (IDL Reference Guide) for additional details.

Example SetProperty Method

The following example code shows a very simple SetProperty method for the

ExampleDataOp operation:

PRO ExampleDataOp::SetProperty, BYTETOP = byteTop, $

_REF_EXTRA = _extra

If (N_ELEMENTS(byteTop) GT 0) THEN BEGIN

self._byteTop = byteTop

ENDIF

IF (N_ELEMENTS(_extra) GT 0) THEN $

self->IDLitDataOperation::SetProperty, _EXTRA = _extra

END

Discussion

The SetProperty method first defines the keywords it will accept. There must be a

keyword for each property of the operation. The keyword inheritance mechanism

allows properties to be set on the

ExampleDataOp class’ superclasses without

knowing the names of the properties.

Using the N_ELEMENTS function, we check to see whether a value was specified

for each keyword. If a value is detected, we set the value of the associated property.

In this example, only one property (ByteTop) is specific to the

ExampleDataOp

object. We set the value of the ExampleProperty directly in the

ExampleDataOp

object’s instance data.

Finally, we call the superclass’ SetProperty method, passing in all of the keywords

stored in the

_extra structure.

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ITT Rule IDL Version 7.0 User Manual Page 163

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