Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php  | 
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| 8 | class ODataLink  | 
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| 9 | { | 
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| 10 | /**  | 
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| 11 | * Name of the link. This becomes last segment of rel attribute value.  | 
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| 12 | *  | 
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| 13 | * @var string  | 
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| 14 | */  | 
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| 15 | public $name;  | 
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| 16 | /**  | 
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| 17 | * Title of the link. This become value of title attribute.  | 
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| 18 | *  | 
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| 19 | * @var string  | 
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| 20 | */  | 
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| 21 | public $title;  | 
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| 22 | /**  | 
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| 23 | * Type of link.  | 
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| 24 | *  | 
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| 25 | * @var string  | 
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| 26 | */  | 
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| 27 | public $type;  | 
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| 28 | /**  | 
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| 29 | * Url to the navigation property. This become value of href attribute.  | 
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| 30 | *  | 
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| 31 | * @var string  | 
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| 32 | */  | 
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| 33 | public $url;  | 
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| 34 | /**  | 
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| 35 | * Checks is Expand result contains single entity or collection of  | 
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| 36 | * entities i.e. feed.  | 
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| 37 | *  | 
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| 38 | * @var bool  | 
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| 39 | */  | 
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| 40 | public $isCollection;  | 
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| 41 | /**  | 
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| 42 | * The expanded result. This becomes the inline content of the link.  | 
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| 43 | *  | 
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| 44 | * @var ODataEntry|ODataFeed  | 
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| 45 | */  | 
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| 46 | public $expandedResult;  | 
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| 47 | /**  | 
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| 48 | * True if Link is Expanded, False if not.  | 
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| 49 | *  | 
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| 50 | * @var bool  | 
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| 51 | */  | 
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| 52 | public $isExpanded;  | 
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| 53 | /**  | 
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| 54 | * @var null  | 
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| 55 | */  | 
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| 56 | public $expandResult;  | 
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| 57 | |||
| 58 | /**  | 
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| 59 | * @return null|\POData\ObjectModel\ODataExpandedResult  | 
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| 60 | */  | 
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| 61 | public function getExpandResult()  | 
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| 62 |     { | 
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| 63 |         if (!$this->isExpanded) { | 
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| 64 | return null;  | 
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| 65 | }  | 
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| 66 |         if ($this->isCollection) { | 
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| 67 | assert($this->expandedResult instanceof ODataFeed);  | 
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| 68 | return new ODataExpandedResult(null, $this->expandedResult);  | 
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| 69 | }  | 
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| 70 | assert($this->expandedResult instanceof ODataEntry);  | 
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| 71 | return new ODataExpandedResult($this->expandedResult);  | 
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| 72 | }  | 
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| 73 | |||
| 74 | /**  | 
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| 75 | * @param \POData\ObjectModel\ODataExpandedResult $eResult  | 
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| 76 | */  | 
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| 77 | public function setExpandResult(ODataExpandedResult $eResult)  | 
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| 90 | }  | 
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| 91 |