1.2.855. Non Nullable Getters

A getter needs to be nullable when a property is injected.

In particular, if the injection happens with a separate method, there is a time where the object is not consistent, and the property holds a default non-object value.

<?php

class Consistent {
    private $db = null;

    function __construct(Db $db) {
        $this->db = $db;
        // Object is immediately consistent
    }

    // Db might be null
    function getDb() {
        return $this->db;
    }
}

class Inconsistent {
    private $db = null;

    function __construct() {
        // No initialisation
    }

    // This might be called on time, or not
    // This typehint cannot be nullable, nor use null as default
    function setDb(DB $db) {
        return $this->db;
    }

    // Db might be null
    function getDb() {
        return $this->db;
    }
}
?>

1.2.855.1. Connex PHP features

• injection

1.2.855.1.1. Suggestions

• Remove the nullable option and the tests on null.

1.2.855.1.2. Specs

Short name	Classes/NonNullableSetters
Rulesets	All, Analyze, Changed Behavior, Class Review
Exakat since	1.9.6
PHP Version	All
Severity	Minor
Time To Fix	Quick (30 mins)
Precision	Very high
Available in	Entreprise Edition, Exakat Cloud