File Prototype.php | ICanBoogie/Prototype 3.0.x

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<?php

/*
 * This file is part of the ICanBoogie package.
 *
 * (c) Olivier Laviale <olivier.laviale@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace ICanBoogie;

use ICanBoogie\Prototype\MethodNotDefined;

/**
 * Manages the prototype methods that may be bound to classes using {@link PrototypeTrait}.
 */
class Prototype implements \ArrayAccess, \IteratorAggregate
{
    /**
     * Prototypes instances per class.
     *
     * @var Prototype[]
     */
    static private $prototypes = [];

    /**
     * Prototype methods per class.
     *
     * @var array
     */
    static private $bindings;

    /**
     * Returns the prototype associated with the specified class or object.
     *
     * @param string|object $class Class name or instance.
     *
     * @return Prototype
     */
    static public function from($class)
    {
        if (is_object($class))
        {
            $class = get_class($class);
        }

        $prototype = &self::$prototypes[$class];

        return $prototype ?: $prototype = new static($class);
    }

    /**
     * Defines prototype methods.
     *
     * @param array $bindings
     */
    static public function bind(array $bindings)
    {
        if (!$bindings)
        {
            return;
        }

        self::update_bindings($bindings);
        self::update_instances($bindings);
    }

    /**
     * Defines prototype methods.
     *
     * @param array $bindings
     *
     * @deprecated
     * @see bind()
     */
    static public function configure(array $bindings)
    {
        self::bind($bindings);
    }

    /**
     * Updates prototype methods with bindings.
     *
     * @param array $bindings
     */
    static private function update_bindings(array $bindings)
    {
        $current = &self::$bindings;

        if (!$current)
        {
            $current = $bindings;
        }

        $intersect = array_intersect_key($bindings, $current);
        $current += array_diff_key($bindings, $current);

        foreach ($intersect as $class => $methods)
        {
            $current[$class] = array_merge($current[$class], $methods);
        }
    }

    /**
     * Updates instances with bindings.
     *
     * @param array $bindings
     */
    static private function update_instances(array $bindings)
    {
        foreach (self::$prototypes as $class => $prototype)
        {
            $prototype->consolidated_methods = null;

            if (empty($bindings[$class]))
            {
                continue;
            }

            $prototype->methods = $bindings[$class] + $prototype->methods;
        }
    }

    /**
     * Class associated with the prototype.
     *
     * @var string
     */
    private $class;

    /**
     * Parent prototype.
     *
     * @var Prototype
     */
    private $parent;

    /**
     * Methods defined by the prototype.
     *
     * @var callable[]
     */
    private $methods = [];

    /**
     * Methods defined by the prototypes chain.
     *
     * @var callable[]|null
     */
    private $consolidated_methods;

    /**
     * Creates a prototype for the specified class.
     *
     * @param string $class
     */
    private function __construct($class)
    {
        $this->class = $class;

        $parent_class = get_parent_class($class);

        if ($parent_class)
        {
            $this->parent = static::from($parent_class);
        }

        if (isset(self::$bindings[$class]))
        {
            $this->methods = self::$bindings[$class];
        }
    }

    /**
     * Returns the consolidated methods of the prototype.
     *
     * @return callable[]
     */
    private function get_consolidated_methods()
    {
        $consolidated_methods = &$this->consolidated_methods;

        if ($consolidated_methods !== null)
        {
            return $consolidated_methods;
        }

        return $consolidated_methods = $this->consolidate_methods();
    }

    /**
     * Consolidate the methods of the prototype.
     *
     * The method creates a single array from the prototype methods and those of its parents.
     *
     * @return callable[]
     */
    private function consolidate_methods()
    {
        $methods = $this->methods;

        if ($this->parent)
        {
            $methods += $this->parent->get_consolidated_methods();
        }

        return $methods;
    }

    /**
     * Revokes the consolidated methods of the prototype.
     *
     * The method must be invoked when prototype methods are modified.
     */
    private function revoke_consolidated_methods()
    {
        $class = $this->class;

        foreach (self::$prototypes as $prototype)
        {
            if (!is_subclass_of($prototype->class, $class))
            {
                continue;
            }

            $prototype->consolidated_methods = null;
        }

        $this->consolidated_methods = null;
    }

    /**
     * Adds or replaces the specified method of the prototype.
     *
     * @param string $method The name of the method.
     *
     * @param callable $callback
     */
    public function offsetSet($method, $callback)
    {
        self::$prototypes[$this->class]->methods[$method] = $callback;

        $this->revoke_consolidated_methods();
    }

    /**
     * Removed the specified method from the prototype.
     *
     * @param string $method The name of the method.
     */
    public function offsetUnset($method)
    {
        unset(self::$prototypes[$this->class]->methods[$method]);

        $this->revoke_consolidated_methods();
    }

    /**
     * Checks if the prototype defines the specified method.
     *
     * @param string $method The name of the method.
     *
     * @return bool
     */
    public function offsetExists($method)
    {
        $methods = &$this->consolidated_methods;

        if ($methods === null) {
            $methods = $this->consolidate_methods();
        }

        return isset($methods[$method]);
    }

    /**
     * Returns the callback associated with the specified method.
     *
     * @param string $method The name of the method.
     *
     * @throws MethodNotDefined if the method is not defined.
     *
     * @return callable
     */
    public function offsetGet($method)
    {
        $methods = &$this->consolidated_methods;

        if ($methods === null) {
            $methods = $this->consolidate_methods();
        }

        if (!isset($methods[$method]))
        {
            throw new MethodNotDefined($method, $this->class);
        }

        return $methods[$method];
    }

    /**
     * Returns an iterator for the prototype methods.
     */
    public function getIterator()
    {
        $methods = &$this->consolidated_methods;

        if ($methods === null) {
            $methods = $this->consolidate_methods();
        }

        return new \ArrayIterator($methods);
    }
}

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