the-4-rules-of-east-oriented-code-rule-4

gistfile1.php

<?php

abstract class data
{
	private
		$value
	;

	function __construct($value)
	{
		if (! is_string($value))
		{
			throw new \domainException('Value should be a string');
		}

		$this->value = $value;
	}

	function __toString()
	{
		return $this->value;
	}
}

final class street extends data
{
}

final class postalCode extends data
{
}

final class apartment extends data
{
}

final class city extends data
{
}

final class province extends data
{
}

class address
{
	private
		$street,
		$postalCode,
		$apartment,
		$city,
		$province,
		$protectPrivacy
	;

	function __construct(apartment $apartment, street $street, city $city, province $province, postalCode $postalCode)
	{
		$this->apartment = $apartment;
		$this->street = $street;
		$this->city = $city;
		$this->province = $province;
		$this->postalCode = $postalCode;
	}

	function enablePrivacyProtection()
	{
		$address = clone $this;
		$address->protectPrivacy = true;

		return $address;
	}

	function streetIsAskedByTemplate(template $template)
	{
		if (! $this->protectPrivacy)
		{
			$template->addressHasStreet($this->street);
		}

		return $this;
	}

	function apartmentIsAskedByTemplate(template $template)
	{
		if (! $this->protectPrivacy)
		{
			$template->addressHasStreet($this->street);
		}

		return $this;
	}

	function postalCodeIsAskedByTemplate(template $template)
	{
		if (! $this->protectPrivacy)
		{
			$template->addressHasPostalCode($this->postalCode);
		}

		return $this;
	}

	function cityIsAskedByTemplate(template $template)
	{
		$template->addressHasCity($this->city);

		return $this;
	}

	function provinceIsAskedByTemplate(template $template)
	{
		$template->addressHasProvince($this->province);

		return $this;
	}
}

class template
{
	private
		$street,
		$apartment,
		$postalCode,
		$city,
		$province
	;

	function addressHasStreet(street $street)
	{
		$this->street = $street;

		return $this;
	}

	function addressHasApartment(apartment $apartment)
	{
		$this->apartment = $apartment;

		return $this;
	}

	function addressHasPostalCode(postalCode $postalCode)
	{
		$this->postalCode = $postalCode;

		return $this;
	}

	function addressHasCity(city $city)
	{
		$this->city = $city;

		return $this;
	}

	function addressHasProvince(province $province)
	{
		$this->province = $province;

		return $this;
	}

	function addressIs(address $address)
	{
		$template = clone $this;
		$template->street = '';
		$template->apartment = '';
		$template->postalCode = '';
		$template->city = '';
		$template->province = '';

		$address
			->streetIsAskedByTemplate($template)
			->apartmentIsAskedByTemplate($template)
			->postalCodeIsAskedByTemplate($template)
			->cityIsAskedByTemplate($template)
			->provinceIsAskedByTemplate($template)
		;

		$string = '';

		if ($template->street)
		{
			$string .= $template->street . PHP_EOL;
		}

		if ($template->apartment)
		{
			$string .= $template->apartment . PHP_EOL;
		}

		if ($template->city)
		{
			$string .= $template->city . PHP_EOL;
		}

		if ($template->province && $template->postalCode)
		{
			$string .= $template->province . ' ' . $template->postalCode . PHP_EOL;
		}

		echo $string;

		return $this;
	}
}

(new template)
	->addressIs(new address(new apartment('6'), new street('123 Main St.'), new city('Arlington'), new province('VA'), new postalCode('22222')))
	->addressIs(
		(new address(new apartment('6'), new street('123 Main St.'), new city('Arlington'), new province('VA'), new postalCode('22222')))
			->enablePrivacyProtection()
	)
;