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Chapter 14

Describes class definitions and shows you how to use them.

Introduction

Terminology

Overview of the Class Definition Process

Creating Class Definitions

Storing Definitions on Workspaces

Class Definition Attributes

Formatting the Text of Attributes

Order of Attributes in Tables

Completing Class Definitions

Specifying the Item Configuration

Providing a Class Name

Specifying the Superior Class(es)

Entering Direct Superior Classes

Specifying Direct Superiors Before Creating Their Definitions

Using Mixin Classes

Specifying Instance Configurations

Determining the Class Inheritance Path

Determining the Initializable System Attributes

Determining the Inherited User-Defined Attributes

Defining and Initializing Class-Specific Attributes

Defining an Untyped Attribute with No Default Value

Defining an Untyped Attribute with a Default Value

Defining a Typed Attribute with a Specified Default Value

Defining a Typed Attribute with a Default Value Provided by G2

Defining an Attribute as an Object Instance

Defining an Attribute for Implied Symbolic Reference

Defining an Indexed Attribute

Specifying Default Values for Inherited Attributes

Overriding Default Values of Inherited User-Defined Attributes

Specifying Default Values of Initializable System-Defined Attributes

Specifying Instantiability

Effects of Setting Instantiability Attributes

Instantiable Classes That Appear in Menus

Noninstantiable Classes That Appear in Menus

Classes That Do Not Appear in Menus

Order of Classes in the G2 Menu Hierarchy

Uninstantiable Subclasses

Specifying an Icon

System-Defined and User-Defined Icons

Icon Inheritance

Using the Icon Editor

Icon Library

Creating Object Classes

System-Defined Object Attributes

Specifying Attribute Displays

Specifying Connection Stubs

Inheriting Default Values for Stubs

Specifying Other Object Class Attributes

Attribute Initializations for Variables and Parameters

Attribute Initializations for Lists and Arrays

Creating Connection Classes

System-Defined Connection Attributes

Defining Connection Regions

Specifying a Stub Length

Defining the Junction Block to Use

Creating a Junction-Block Subclass

Creating Connection Post Classes

System-Defined Connection Post Attribute

Specifying the Superior Connection

Creating Message Classes

System-Defined Message Attribute

Specifying Default Message Properties

Using Specialized Definitions

Mixing Generic and Specialized Definitions

Creating an Object Definition

Creating a Connection Definition

Creating a Message Definition

Customizing Definition Classes

Creating New Classes Programmatically

Changing Definitions

Using the Change Attribute

Adding a Connection Stub to an Object Class Definition

Changing an Attribute to its Default Value in Instances

Changing Stubs in Object Class Definitions

Copying an Inherited Icon-description in Object Class Definitions

Deleting Connections in Object Class Definitions

Merging all Instances and Subclasses into a Definition

Moving Attributes from One Class to Another

Moving Connections

Renaming an Attribute

Updating the Attribute Displays of All instances of a Class

Updating the Default Message Properties of All Class Instances

Changing Definitions with the Conclude Action

Effect on Subclasses and Instances

Effect on Procedure Statements and Other Items

Changing Instantiated Classes

Merging Classes

Merging Definitions of the Same Type

Merging Definitions of Different Types

Completing a Merge

Deleting a Definition

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