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<?php namespace nyx\console\input\parameter; |
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// External dependencies |
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use nyx\core; |
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// Internal dependencies |
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use nyx\console\input; |
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/** |
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* Input Values |
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* |
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* Base class for Input Argument and Option value collections. |
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* |
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* Those collections are bound by their definitions and as such parameters that are not defined cannot be set. |
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* They can also not escape their definition, eg. a definition may only be set during construction to avoid |
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* mismatches between the master and the bag definitions referenced in Values collections. |
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* |
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* @version 0.1.0 |
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* @author Michal Chojnacki <[email protected]> |
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* @copyright 2012-2017 Nyx Dev Team |
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* @link https://github.com/unyx/nyx |
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*/ |
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abstract class Values extends core\collections\Map |
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{ |
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/** |
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* @var Definitions The Definitions of the Parameters that can be present in this collection. |
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*/ |
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protected $definitions; |
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/** |
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* Constructs an Input Values instance. |
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* |
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* @param Definitions $definition The Definitions of the Parameters that can be present in this collection. |
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*/ |
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public function __construct(Definitions $definition) |
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{ |
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$this->definitions = $definition; |
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} |
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/** |
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* Returns the Definitions of the Parameters that can be present in this collection. |
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* |
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* @return Definitions |
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*/ |
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public function definitions() : Definitions |
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{ |
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return $this->definitions; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* Overridden to populate the resulting array with default values for Parameters that are |
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* not actually set. |
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*/ |
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public function all() : array |
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{ |
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$return = $this->items; |
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// Not doing a simple array merge to preserve the key mapping of the parameters. |
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foreach ($this->definitions->getDefaultValues() as $name => $value) { |
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if (!isset($return[$name])) { |
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$return[$name] = $value; |
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} |
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} |
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return $return; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* Overridden to fall back to the default value defined for the given parameter if no value has been |
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* set for it and no $default has been given either. |
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*/ |
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public function get($name, $default = null) |
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{ |
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$parameter = $this->assertIsDefined($name); |
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// If a value for the given Parameter has been set, return it. Otherwise the default value |
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// passed to this method takes precedence over default values set in the Value's Definition, if any. |
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return $this->items[$name] ?? ($default ?? (($value = $parameter->getValue()) ? $value->getDefault() : $default)); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function set($name, $value) : core\collections\interfaces\Map |
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{ |
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$parameter = $this->assertIsDefined($name); |
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// When dealing with a multi-value parameter, push the value into an array instead of just setting it, |
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// unless it's an array itself (in which case it will override the currently set array). |
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if ($parameter->getValue() instanceof input\values\Multiple && !is_array($value)) { |
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$this->items[$name][] = $value; |
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} else { |
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$this->items[$name] = $value; |
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} |
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return $this; |
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} |
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/** |
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* Asserts a Parameter with the given name is defined for this collection and returns it. |
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* |
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* @param string $name The name of the Parameter. |
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* @throws \OutOfBoundsException When no Parameter with the given name has been defined. |
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* @return input\Parameter |
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*/ |
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protected function assertIsDefined(string $name) : input\Parameter |
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{ |
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/* @var input\Parameter $parameter */ |
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if (!$parameter = $this->definitions->get($name)) { |
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throw new \OutOfBoundsException("The parameter [$name] is not defined."); |
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} |
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return $parameter; |
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} |
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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.