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	<?php
	/**
	 * Register a dependency. The following formats are allowed:
	 * 
	 * 1. Fully qualified class (or interface) name with factory closure:
	 *     $injector->register('Fully\Qualified\ClassName', function { .... });
	 *
	 * 2. Fully qualified class (or interface) name with instance of said class:
	 *     $injector->register('Fully\Qualified\ClassName', $instance);
	 *
	 * 3. Fully qualified class (or interface) name with factory Callable:
	 *     $injector->register('Fully\Qualified\ClassName', [$instance, 'factoryMethod']);
	 *
	 * 4. Fully qualified class name only. Will inject dependencies into the constructor
	 *     $injector->register('Fully\Qualified\ClassName');
	 *
	 * 5. Fully qualified interface name with fully qualified class name:
	 *     $injector->register('Fuilly\Qualified\InterfaceName', 'Fully\Qualified\ClassName');
	 *
	 * 6. Instance only:
	 *     $injector->register($instance);
	 *
	 * @param mixed $type
	 *     A fully qualified class name, interface name, or object
	 *
	 * @param mixed $implementation
	 *     A Closure factory, Callable factory, instance, or fully qualified class name
	 *
	 * @return iMarc\Zap\Injector
	 *     The injector instance
	 */
	public function register($type, $implementation = null)
	{
		if ($implementation instanceof Closure) {
			$this->factories[$type] = $implementation;
		} else if (is_object($implementation)) {
			$this->instances[$type] = $implementation;
		} else if (is_callable($implementation) {
			$this->factories[$type] = $implementation;
		} else if ($implementation === null && is_string($type)) {
			$this->factories[$type] = $this->createFactory($type);
		} else if (is_string($type) && is_string($implementation)) {
			$this->factories[$type] = $this->createFactory($implementation);
		} else if ($implementation === null && is_object($type)) {
			$this->instance[get_class($type)] = $type;
		} else {
			throw new InvalidArgumentException("Invalid dependency registration");
		}

		return $this;
	}