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<?php |
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/** |
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* Jaeger |
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* |
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* @copyright Copyright (c) 2015-2016, mithra62 |
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* @link http://jaeger-app.com |
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* @version 1.0 |
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* @filesource ./Validate/AbstractRule.php |
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*/ |
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namespace JaegerApp\Validate; |
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use JaegerApp\Validate\RuleInterface; |
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use JaegerApp\Exceptions\ValidateException; |
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/** |
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* Jaeger - Abstract Validation Rule |
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* |
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* Contains useful helper methods for the validators |
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* |
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* @package Validate |
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* @author Eric Lamb <[email protected]> |
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*/ |
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abstract class AbstractRule implements RuleInterface |
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{ |
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/** |
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* The shortname of the rule |
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* Must be unique! |
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* |
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* @var string |
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*/ |
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protected $name = ''; |
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/** |
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* The error template |
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* |
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* @var string |
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*/ |
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protected $error_message = ''; |
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/** |
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* The name of the test file for upload testing |
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* |
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* @var string |
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*/ |
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protected $test_file = 'test.txt'; |
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/** |
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* The content the test file should contain for comparison testing |
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* |
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* @var string |
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*/ |
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protected $test_string = 'm62'; |
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/** |
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* Returns the path to the test file |
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*/ |
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protected function getTestFilePath() |
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{ |
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return realpath(dirname(__FILE__) . '/' . $this->test_file); |
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} |
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/** |
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* (non-PHPdoc) |
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* |
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* @ignore |
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* |
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* @see \mithra62\Validate\RuleInterface::getErrorMessage() |
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*/ |
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public function getErrorMessage() |
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{ |
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if ($this->error_message == '') { |
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throw new ValidateException('Error Message is empty!'); |
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} |
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return $this->error_message; |
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} |
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/** |
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* Sets the error message for the rule |
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* |
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* @param string $message |
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* @return RuleInterface |
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*/ |
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public function setErrorMessage($message) |
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{ |
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$this->error_message = $message; |
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return $this; |
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} |
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/** |
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* Sets the name parameter |
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* |
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* @param string $name |
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* @return RuleInterface |
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*/ |
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public function setName($name) |
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{ |
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$this->name = $name; |
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return $this; |
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} |
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/** |
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* (non-PHPdoc) |
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* |
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* @ignore |
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* |
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* @see \mithra62\Validate\RuleInterface::getName() |
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*/ |
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public function getName() |
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{ |
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if ($this->name == '') { |
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throw new ValidateException('Rule name is empty!'); |
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} |
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return $this->name; |
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} |
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} |
If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.