Class Reference

This section documents the most important classes in Bold for Delphi.

Class Hierarchy

classDiagram
    class TBoldElement {
        <<abstract>>
    }

    class TBoldDomainElement {
        <<abstract>>
    }

    class TBoldMember {
        <<abstract>>
        +BoldObject
        +OwningElement
    }

    class TBoldAttribute {
        +AsString
        +AsInteger
        +IsNull
    }

    class TBoldObjectReference {
        +BoldObject
    }

    class TBoldObjectList {
        +Count
        +Add()
        +Remove()
    }

    class TBoldObject {
        +BoldSystem
        +BoldMembers
        +Delete()
    }

    class TBoldSystem {
        +Classes
        +DirtyObjects
        +UpdateDatabase()
    }

    TBoldElement <|-- TBoldDomainElement
    TBoldDomainElement <|-- TBoldMember
    TBoldDomainElement <|-- TBoldObject
    TBoldMember <|-- TBoldAttribute
    TBoldMember <|-- TBoldObjectReference
    TBoldMember <|-- TBoldObjectList
    TBoldElement <|-- TBoldSystem

    click TBoldElement href "TBoldElement/" "TBoldElement documentation"
    click TBoldSystem href "TBoldSystem/" "TBoldSystem documentation"
    click TBoldObject href "TBoldObject/" "TBoldObject documentation"
    click TBoldObjectList href "TBoldObjectList/" "TBoldObjectList documentation"
    click TBoldMember href "TBoldMember/" "TBoldMember documentation"
    click TBoldAttribute href "TBoldAttribute/" "TBoldAttribute documentation"
    click TBoldObjectReference href "TBoldObjectReference/" "TBoldObjectReference documentation"

Core Classes

Class	Description
TBoldElement	Abstract base class for all Bold elements
TBoldSystem	The Object Space - manages all objects
TBoldObject	Base class for all domain objects
TBoldObjectList	Collection of Bold objects
TBoldMember	Base class for attributes and references
TBoldAttribute	Stores attribute values
TBoldObjectReference	Single-valued associations

Attribute Types

Class	Description
TBAString	String attributes (Unicode, ANSI, trimmed, text)
TBAInteger	Integer attributes (Integer, SmallInt, Word, Byte)
TBAFloat	Double floating-point attributes
TBACurrency	Fixed-point currency attributes
TBAMoment	Date/time attributes (DateTime, Date, Time)
TBABoolean	Boolean attributes
TBABlob	Binary large object attributes

Handle Classes

Class	Description
TBoldSystemHandle	Manages the Object Space connection
TBoldListHandle	OCL list expressions with filtering and sorting
TBoldExpressionHandle	Single value OCL expressions
TBoldPersistenceHandle	Connects Object Space to database

Subscription & Derivation

Class	Description
TBoldPublisher	Event sender — manages subscriptions
TBoldSubscriber	Event receiver — abstract base
TBoldPassthroughSubscriber	Delegates events to callback methods
TBoldAbstractDeriver	Automatic value derivation engine

Runtime Type Info

Class	Description
TBoldSystemTypeInfo	Model-wide type registry
TBoldClassTypeInfo	Per-class metadata (members, hierarchy)
TBoldMemberRTInfo	Per-member metadata (type, persistence, derivation)

GUI Components

Class	Description
TBoldGrid	Data-aware grid for object lists
TBoldEdit	Data-aware text edit
TBoldLabel	Data-aware read-only label
TBoldComboBox	Data-aware combo box with lookup
TBoldCheckBox	Data-aware boolean checkbox

Utilities

Class	Description
TBoldGuard	Automatic memory management via interface ref counting
TBoldObjectId	Object identity for persistence

Relationship Between Classes

flowchart TB
    System[TBoldSystem]
    ClassExtent[TBoldClassExtent]
    Object[TBoldObject]
    Attribute[TBoldAttribute]
    Reference[TBoldObjectReference]
    List[TBoldObjectList]

    System -->|"manages"| ClassExtent
    ClassExtent -->|"contains"| Object
    Object -->|"has members"| Attribute
    Object -->|"has members"| Reference
    Object -->|"has members"| List
    Reference -->|"points to"| Object
    List -->|"contains"| Object

    click System href "TBoldSystem/" "TBoldSystem documentation"
    click Object href "TBoldObject/" "TBoldObject documentation"
    click Attribute href "TBoldAttribute/" "TBoldAttribute documentation"
    click Reference href "TBoldObjectReference/" "TBoldObjectReference documentation"
    click List href "TBoldObjectList/" "TBoldObjectList documentation"

Common Patterns

Accessing Objects

// From system
var System: TBoldSystem := BoldSystemHandle1.System;

// Get all instances of a class
var Customers: TBoldObjectList := System.Classes['Customer'].BoldObjects;

// Navigate from object
var Orders: TBoldObjectList := Customer.Orders;

Modifying Objects

// Change attribute
Customer.Name := 'New Name';

// Add to list
Customer.Orders.Add(NewOrder);

// Delete object
Customer.Delete;

Querying Objects

// OCL query
var Result: TBoldObjectList := System.EvaluateExpressionAsNewElement(
  'Customer.allInstances->select(active)',
  nil
) as TBoldObjectList;