The Componere\Definition class

    (Componere 2 >= 2.1.0)

    Introduction

    The Definition class allows the programmer to build and register a type at runtime.

    Should a Definition replace an existing class, the existing class will be restored when the Definition is destroyed.

    Class synopsis

    final class Componere\Definition extends Componere\Abstract\Definition {
    /* Constructors */
    public __construct(string $name)
    public __construct(string $name, string $parent)
    public __construct(string $name, array $interfaces)
    public __construct(string $name, string $parent, array $interfaces)
    /* Methods */
    public addConstant(string $name, Componere\Value $value): Definition
    public addProperty(string $name, Componere\Value $value): Definition
    public register(): void
    public isRegistered(): bool
    public getClosure(string $name): Closure
    public getClosures(): array
    /* Inherited methods */
    public Componere\Abstract\Definition::addInterface(string $interface): Definition
    public Componere\Abstract\Definition::addMethod(string $name, Componere\Method $method): Definition
    public Componere\Abstract\Definition::addTrait(string $trait): Definition
    public Componere\Abstract\Definition::getReflector(): ReflectionClass
    }

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    User Contributed Notes 1 note

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    ASchmidt at Anamera dot net
    6 years ago
    Sometimes we might wish to extend a third party class that has been defined as "final".

    In this example, the a child class will extend a "final" class, adding a method. An object instance will be able to access parent members, and is recognized as an instance of both the dynamically created child class as well as its parent class.

    <?php
    declare(strict_types=1);

    /*
    * Final class would normally prevent extending.
    */
    final class ParentC
    {
    public     $parentvar;
    public     $secondvar;

    function     __construct() { echo( "\r\n<br/>".$this->parentvar = 'set by '.get_class().'->parentconstruct' ); }
    function     parentf() { echo( "\r\n<br/>".get_class().'->parentf >> '.$this->parentvar ); }
    }

    /*
    * Dynamically define a child class "DynamicC"
    * which successfully extends final class "ParentC".
    */
    $DefC = new \Componere\Definition( 'DynamicC', 'ParentC');

    // Extend child class with method 'DynamicC::dynamicf()'.
    $DefM = new Componere\Method( function( $parm = null ) {
    // Populate a parent class property.
    $this->secondvar = empty( $parm ) ? 'set by '.get_class().'->dynamicf' : $parm;
    // Access an inherited property set by parent constructor.
    echo( "\r\n<br/>".get_class().'->dynamicf >> '.$this->parentvar );
    } );
    $DefC->addMethod( 'dynamicf', $DefM );

    // Take dynamic child class 'life'.
    $DefC->register();

    /*
    * Instantiate the dynamic child class,
    * and access its own and inherited members.
    */

    $dyno = new DynamicC;
    $dyno->parentf();
    $dyno->dynamicf( 'myvalue ');

    // Our object is also recognized as instance of parent!
    var_dump( $dyno instanceof DynamicC, $dyno instanceof ParentC );
    var_dump( $dyno );
    %>

    will output:

    set by ParentC->parentconstruct
    ParentC    ->parentf >> set by ParentC->parentconstruct
    DynamicC    ->dynamicf >> set by ParentC->parentconstruct

    (boolean) true
    (boolean) true

    object    (DynamicC)
    public     'parentvar' => string 'set by ParentC->parentconstruct' (length=31)
    public     'secondvar' => string 'myvalue ' (length=8)
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