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<?php |
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/** |
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* PHPCoord. |
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* |
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* @author Doug Wright |
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*/ |
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declare(strict_types=1); |
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namespace PHPCoord\UnitOfMeasure\Scale; |
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use PHPCoord\Exception\UnknownUnitOfMeasureException; |
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use PHPCoord\UnitOfMeasure\UnitOfMeasure; |
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abstract class Scale implements UnitOfMeasure |
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{ |
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/** |
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* Coefficient |
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* Used when parameters are coefficients. They inherently take the units which depend upon the term to which the |
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* coefficient applies. |
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*/ |
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public const EPSG_COEFFICIENT = 'urn:ogc:def:uom:EPSG::9203'; |
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/** |
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* Parts per billion |
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* Billion is internationally ambiguous, in different languages being 1E+9 and 1E+12. One billion taken here to be |
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* 1E+9. |
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*/ |
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public const EPSG_PARTS_PER_BILLION = 'urn:ogc:def:uom:EPSG::1028'; |
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/** |
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* Parts per million. |
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*/ |
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public const EPSG_PARTS_PER_MILLION = 'urn:ogc:def:uom:EPSG::9202'; |
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/** |
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* Unity |
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* EPSG standard unit for scale. SI coherent derived unit (standard unit) for dimensionless quantity, expressed by |
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* the number one but this is not explicitly shown. |
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*/ |
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public const EPSG_UNITY = 'urn:ogc:def:uom:EPSG::9201'; |
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protected static array $sridData = [ |
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'urn:ogc:def:uom:EPSG::1028' => [ |
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'name' => 'parts per billion', |
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], |
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'urn:ogc:def:uom:EPSG::9201' => [ |
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'name' => 'unity', |
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], |
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'urn:ogc:def:uom:EPSG::9202' => [ |
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'name' => 'parts per million', |
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], |
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'urn:ogc:def:uom:EPSG::9203' => [ |
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'name' => 'coefficient', |
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], |
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]; |
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protected static array $customSridData = []; |
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private static array $supportedCache = []; |
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abstract public function __construct(float $scale); |
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abstract public function asUnity(): Unity; |
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public function add(self $unit): self |
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{ |
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if ($this::class === $unit::class) { |
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return new static($this->getValue() + $unit->getValue()); |
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} |
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$resultAsUnity = new Unity($this->asUnity()->getValue() + $unit->asUnity()->getValue()); |
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$conversionRatio = (new static(1))->asUnity()->getValue(); |
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return new static($resultAsUnity->getValue() / $conversionRatio); |
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} |
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public function subtract(self $unit): self |
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{ |
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if ($this::class === $unit::class) { |
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return new static($this->getValue() - $unit->getValue()); |
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} |
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$resultAsUnity = new Unity($this->asUnity()->getValue() - $unit->asUnity()->getValue()); |
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$conversionRatio = (new static(1))->asUnity()->getValue(); |
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return new static($resultAsUnity->getValue() / $conversionRatio); |
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} |
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public function multiply(float $multiplicand): self |
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{ |
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return new static($this->getValue() * $multiplicand); |
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} |
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public function divide(float $divisor): self |
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{ |
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return new static($this->getValue() / $divisor); |
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} |
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public static function makeUnit(float $measurement, string $srid): self |
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{ |
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if (isset(self::$customSridData[$srid])) { |
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return new self::$customSridData[$srid]['fqcn']($measurement); |
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} |
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return match ($srid) { |
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self::EPSG_COEFFICIENT => new Coefficient($measurement), |
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self::EPSG_PARTS_PER_BILLION => new PartsPerBillion($measurement), |
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self::EPSG_PARTS_PER_MILLION => new PartsPerMillion($measurement), |
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self::EPSG_UNITY => new Unity($measurement), |
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default => throw new UnknownUnitOfMeasureException($srid), |
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}; |
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} |
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public static function getSupportedSRIDs(): array |
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{ |
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if (!self::$supportedCache) { |
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foreach (static::$sridData as $srid => $data) { |
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self::$supportedCache[$srid] = $data['name']; |
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} |
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} |
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return self::$supportedCache; |
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} |
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public static function registerCustomUnit(string $srid, string $name, string $implementingClassFQCN): void |
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{ |
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self::$customSridData[$srid] = ['name' => $name, 'fqcn' => $implementingClassFQCN]; |
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self::getSupportedSRIDs(); // init cache if not already |
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self::$supportedCache[$srid] = $name; // update cache |
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} |
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public function __toString(): string |
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{ |
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return (string) $this->getValue(); |
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} |
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} |
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dvdoug /
PHPCoord
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.