Online PHP editor | rfc for QKvIW

@ 2014-05-23T22:25:59Z

<?php

interface IWidget
{

}

class WidgetA implements IWidget
{

}

class WidgetB implements IWidget
{

}

interface IWidgetFactory
{

    function tryCreateWidget($someInput, IWidget &$widget);

}

class WidgetAFactory implements IWidgetFactory
{

    public function tryCreateWidget($someInput, IWidget &$widget)
    {
        if ($someInput < 7) {
            $widget = new WidgetA();
            return true;
        }
        return false;
    }

}

class WidgetBFactory implements IWidgetFactory
{

    public function tryCreateWidget($someInput, IWidget &$widget)
    {
        if ($someInput > 10) {
            $widget = new WidgetB();
            return true;
        }
        return false;
    }

}

class WidgetFactoryAggregate implements IWidgetFactory
{

    private $widgetFactories = [];

    function __construct(array $widgetFactories)
    {
        $this->widgetFactories = $widgetFactories;
    }

    public function tryCreateWidget($someInput, IWidget &$widget)
    {
        foreach ($this->widgetFactories as $widgetFactory) {
            if ($widgetFactory->tryCreateWidget($someInput)) {
                return true;
            }
        }
        return false;
    }

}

$widgetFactory = new WidgetFactoryAggregate([
    new WidgetAFactory(),
    new WidgetBFactory(),
]);

foreach ([1, 5, 15, 9] as $someInput) {
    $widget = null;
    if ($widgetFactory->tryCreateWidget($someInput, $widget)) {
        var_dump($widget);
        continue;
    }
    throw new Exception("Failed to create widget for {$someInput}");
}

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: WidgetFactoryAggregate::tryCreateWidget(): Argument #2 ($widget) must be of type IWidget, null given, called in /in/QKvIW on line 82 and defined in /in/QKvIW:63 Stack trace: #0 /in/QKvIW(82): WidgetFactoryAggregate->tryCreateWidget(1, NULL) #1 {main} thrown in /in/QKvIW on line 63
Process exited with code 255.

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