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1 | <?php |
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2 | |||
3 | /** |
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4 | * Class for the 'geodistance' parser hooks, which can |
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5 | * calculate the geographical distance between two points. |
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6 | * |
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7 | * @since 0.7 |
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8 | * |
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9 | * @licence GNU GPL v2+ |
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10 | * @author Jeroen De Dauw < [email protected] > |
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11 | */ |
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12 | |||
13 | class MapsGeodistance extends ParserHook { |
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14 | |||
15 | /** |
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16 | * Gets the name of the parser hook. |
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17 | * @see ParserHook::getName |
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18 | * |
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19 | * @since 0.7 |
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20 | * |
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21 | * @return string |
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22 | */ |
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23 | protected function getName() { |
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24 | return 'geodistance'; |
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25 | } |
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26 | |||
27 | /** |
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28 | * Returns an array containing the parameter info. |
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29 | * @see ParserHook::getParameterInfo |
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30 | * |
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31 | * @since 0.7 |
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32 | * |
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33 | * @return array |
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34 | */ |
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35 | protected function getParameterInfo( $type ) { |
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36 | global $egMapsDistanceUnit, $egMapsDistanceDecimals, $egMapsAvailableGeoServices, $egMapsDefaultGeoService; |
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37 | |||
38 | $params = []; |
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39 | |||
40 | $params['mappingservice'] = [ |
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41 | 'default' => '', |
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42 | 'values' => MapsMappingServices::getAllServiceValues(), |
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43 | 'tolower' => true, |
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44 | ]; |
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45 | |||
46 | $params['geoservice'] = [ |
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47 | 'default' => $egMapsDefaultGeoService, |
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48 | 'aliases' => 'service', |
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49 | 'values' => $egMapsAvailableGeoServices, |
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50 | 'tolower' => true, |
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51 | ]; |
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52 | |||
53 | $params['unit'] = [ |
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54 | 'default' => $egMapsDistanceUnit, |
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55 | 'values' => MapsDistanceParser::getUnits(), |
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56 | ]; |
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57 | |||
58 | $params['decimals'] = [ |
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59 | 'type' => 'integer', |
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60 | 'default' => $egMapsDistanceDecimals, |
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61 | ]; |
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62 | |||
63 | $params['location1'] = [ |
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64 | 'type' => 'mapslocation', |
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65 | 'aliases' => 'from', |
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66 | 'dependencies' => [ 'mappingservice', 'geoservice' ], |
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67 | ]; |
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68 | |||
69 | $params['location2'] = [ |
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70 | 'type' => 'mapslocation', |
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71 | 'aliases' => 'to', |
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72 | 'dependencies' => [ 'mappingservice', 'geoservice' ], |
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73 | ]; |
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74 | |||
75 | // Give grep a chance to find the usages: |
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76 | // maps-geodistance-par-mappingservice, maps-geodistance-par-geoservice, |
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77 | // maps-geodistance-par-unit, maps-geodistance-par-decimals, |
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78 | // maps-geodistance-par-location1, maps-geodistance-par-location2 |
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79 | foreach ( $params as $name => &$param ) { |
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80 | $param['message'] = 'maps-geodistance-par-' . $name; |
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81 | } |
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82 | |||
83 | return $params; |
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84 | } |
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85 | |||
86 | /** |
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87 | * Returns the list of default parameters. |
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88 | * @see ParserHook::getDefaultParameters |
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89 | * |
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90 | * @since 0.7 |
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91 | * |
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92 | * @param $type |
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93 | * |
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94 | * @return array |
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95 | */ |
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96 | protected function getDefaultParameters( $type ) { |
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97 | return [ 'location1', 'location2', 'unit', 'decimals' ]; |
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98 | } |
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99 | |||
100 | /** |
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101 | * Renders and returns the output. |
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102 | * @see ParserHook::render |
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103 | * |
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104 | * @since 0.7 |
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105 | * |
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106 | * @param array $parameters |
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107 | * |
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108 | * @return string |
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109 | * @throws MWException |
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110 | */ |
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111 | public function render( array $parameters ) { |
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112 | /** |
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113 | * @var \DataValues\LatLongValue $coordinates1 |
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114 | * @var \DataValues\LatLongValue $coordinates2 |
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115 | */ |
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116 | $coordinates1 = $parameters['location1']->getCoordinates(); |
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117 | $coordinates2 = $parameters['location2']->getCoordinates(); |
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118 | |||
119 | $distance = MapsGeoFunctions::calculateDistance( $coordinates1, $coordinates2 ); |
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120 | $output = MapsDistanceParser::formatDistance( $distance, $parameters['unit'], $parameters['decimals'] ); |
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121 | |||
122 | return $output; |
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123 | } |
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124 | |||
125 | /** |
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126 | * @see ParserHook::getMessage |
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127 | * |
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128 | * @since 1.0 |
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129 | */ |
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130 | public function getMessage() { |
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131 | return 'maps-geodistance-description'; |
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The return type of
return 'maps-geodistance-description'; (string ) is incompatible with the return type of the parent method ParserHook::getMessage of type boolean .
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: class Author {
private $name;
public function __construct($name) {
$this->name = $name;
}
public function getName() {
return $this->name;
}
}
abstract class Post {
public function getAuthor() {
return 'Johannes';
}
}
class BlogPost extends Post {
public function getAuthor() {
return new Author('Johannes');
}
}
class ForumPost extends Post { /* ... */ }
function my_function(Post $post) {
echo strtoupper($post->getAuthor());
}
Our function
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132 | } |
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133 | |||
134 | } |
This class, trait or interface has been deprecated. The supplier of the file has supplied an explanatory message.
The explanatory message should give you some clue as to whether and when the type will be removed from the class and what other constant to use instead.