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<?php |
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namespace PSB\Core\Util; |
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use PSB\Core\Exception\RuntimeException; |
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use PSB\Core\Exception\OutOfBoundsException; |
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class Settings implements ReadOnlySettingsInterface |
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{ |
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/** |
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* @var array |
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*/ |
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private $defaults = []; |
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/** |
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* @var array |
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*/ |
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private $overrides = []; |
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/** |
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* @var bool |
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*/ |
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private $locked = false; |
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/** |
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* Returns the value for the $key. Throws an exception is value is not found in overrides. |
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* |
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* @param string $key |
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* |
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* @throws OutOfBoundsException |
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* @return mixed |
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*/ |
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public function get($key) |
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{ |
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if (isset($this->overrides[$key])) { |
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return $this->overrides[$key]; |
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} |
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if (isset($this->defaults[$key])) { |
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return $this->defaults[$key]; |
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} |
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throw new OutOfBoundsException("The given key '$key' was not present in the settings."); |
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} |
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/** |
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* Returns the value for the $key searching through overrides and defaults. Returns null if not found. |
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* |
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* @param string $key |
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* |
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* @return mixed |
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*/ |
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public function tryGet($key) |
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{ |
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if (isset($this->overrides[$key])) { |
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return $this->overrides[$key]; |
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} |
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if (isset($this->defaults[$key])) { |
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return $this->defaults[$key]; |
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} |
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return null; |
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} |
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/** |
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* Returns true if there is an override or a default value for $key |
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* |
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* @param string $key |
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* |
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* @return bool |
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*/ |
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public function has($key) |
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{ |
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if (isset($this->overrides[$key]) || isset($this->defaults[$key])) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @param string $key |
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* @param mixed $value |
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*/ |
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public function set($key, $value) |
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{ |
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$this->assertWriteable(); |
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$this->overrides[$key] = $value; |
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} |
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/** |
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* @param string $key |
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* @param mixed $value |
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*/ |
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public function setDefault($key, $value) |
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{ |
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$this->assertWriteable(); |
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$this->defaults[$key] = $value; |
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} |
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private function assertWriteable() |
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{ |
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if ($this->locked) { |
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throw new RuntimeException("Settings container has been write private."); |
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} |
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} |
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public function preventChanges() |
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{ |
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$this->locked = true; |
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} |
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} |