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:
Complex classes like Event often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Event, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 30 | class Event extends Component  | 
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| 31 | { | 
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| 32 | const TIME_TRANSPARENCY_OPAQUE = 'OPAQUE';  | 
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| 33 | const TIME_TRANSPARENCY_TRANSPARENT = 'TRANSPARENT';  | 
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| 34 | |||
| 35 | const STATUS_TENTATIVE = 'TENTATIVE';  | 
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| 36 | const STATUS_CONFIRMED = 'CONFIRMED';  | 
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| 37 | const STATUS_CANCELLED = 'CANCELLED';  | 
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| 38 | |||
| 39 | const MS_BUSYSTATUS_FREE = 'FREE';  | 
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| 40 | const MS_BUSYSTATUS_TENTATIVE = 'TENTATIVE';  | 
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| 41 | const MS_BUSYSTATUS_BUSY = 'BUSY';  | 
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| 42 | const MS_BUSYSTATUS_OOF = 'OOF';  | 
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| 43 | |||
| 44 | /**  | 
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| 45 | * @var string  | 
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| 46 | */  | 
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| 47 | protected $uniqueId;  | 
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| 48 | |||
| 49 | /**  | 
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| 50 | * The property indicates the date/time that the instance of  | 
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| 51 | * the iCalendar object was created.  | 
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| 52 | *  | 
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| 53 | * The value MUST be specified in the UTC time format.  | 
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| 54 | *  | 
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| 55 | * @var \DateTime  | 
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| 56 | */  | 
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| 57 | protected $dtStamp;  | 
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| 58 | |||
| 59 | /**  | 
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| 60 | * @var \DateTime  | 
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| 61 | */  | 
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| 62 | protected $dtStart;  | 
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| 63 | |||
| 64 | /**  | 
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| 65 | * Preferentially chosen over the duration if both are set.  | 
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| 66 | *  | 
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| 67 | * @var \DateTime  | 
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| 68 | */  | 
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| 69 | protected $dtEnd;  | 
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| 70 | |||
| 71 | /**  | 
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| 72 | * @var \DateInterval  | 
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| 73 | */  | 
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| 74 | protected $duration;  | 
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| 75 | |||
| 76 | /**  | 
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| 77 | * @var bool  | 
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| 78 | */  | 
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| 79 | protected $noTime = false;  | 
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| 80 | |||
| 81 | /**  | 
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| 82 | * @var string  | 
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| 83 | */  | 
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| 84 | protected $msBusyStatus = null;  | 
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| 85 | |||
| 86 | /**  | 
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| 87 | * @var string  | 
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| 88 | */  | 
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| 89 | protected $url;  | 
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| 90 | |||
| 91 | /**  | 
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| 92 | * @var string  | 
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| 93 | */  | 
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| 94 | protected $location;  | 
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| 95 | |||
| 96 | /**  | 
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| 97 | * @var string  | 
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| 98 | */  | 
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| 99 | protected $locationTitle;  | 
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| 100 | |||
| 101 | /**  | 
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| 102 | * @var Geo  | 
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| 103 | */  | 
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| 104 | protected $locationGeo;  | 
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| 105 | |||
| 106 | /**  | 
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| 107 | * @var string  | 
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| 108 | */  | 
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| 109 | protected $summary;  | 
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| 110 | |||
| 111 | /**  | 
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| 112 | * @var Organizer  | 
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| 113 | */  | 
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| 114 | protected $organizer;  | 
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| 115 | |||
| 116 | /**  | 
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| 117 | * @see https://tools.ietf.org/html/rfc5545#section-3.8.2.7  | 
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| 118 | *  | 
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| 119 | * @var string  | 
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| 120 | */  | 
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| 121 | protected $transparency = self::TIME_TRANSPARENCY_OPAQUE;  | 
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| 122 | |||
| 123 | /**  | 
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| 124 | * If set to true the timezone will be added to the event.  | 
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| 125 | *  | 
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| 126 | * @var bool  | 
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| 127 | */  | 
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| 128 | protected $useTimezone = false;  | 
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| 129 | |||
| 130 | /**  | 
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| 131 | * If set will be used as the timezone identifier.  | 
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| 132 | *  | 
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| 133 | * @var string  | 
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| 134 | */  | 
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| 135 | protected $timezoneString = '';  | 
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| 136 | |||
| 137 | /**  | 
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| 138 | * @var int  | 
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| 139 | */  | 
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| 140 | protected $sequence = 0;  | 
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| 141 | |||
| 142 | /**  | 
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| 143 | * @var Attendees  | 
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| 144 | */  | 
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| 145 | protected $attendees;  | 
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| 146 | |||
| 147 | /**  | 
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| 148 | * @var string  | 
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| 149 | */  | 
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| 150 | protected $description;  | 
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| 151 | |||
| 152 | /**  | 
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| 153 | * @var string  | 
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| 154 | */  | 
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| 155 | protected $descriptionHTML;  | 
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| 156 | |||
| 157 | /**  | 
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| 158 | * @var string  | 
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| 159 | */  | 
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| 160 | protected $status;  | 
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| 161 | |||
| 162 | /**  | 
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| 163 | * @var RecurrenceRule  | 
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| 164 | */  | 
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| 165 | protected $recurrenceRule;  | 
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| 166 | |||
| 167 | /**  | 
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| 168 | * @var array  | 
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| 169 | */  | 
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| 170 | protected $recurrenceRules = [];  | 
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| 171 | |||
| 172 | /**  | 
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| 173 | * This property specifies the date and time that the calendar  | 
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| 174 | * information was created.  | 
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| 175 | *  | 
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| 176 | * The value MUST be specified in the UTC time format.  | 
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| 177 | *  | 
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| 178 | * @var \DateTime  | 
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| 179 | */  | 
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| 180 | protected $created;  | 
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| 181 | |||
| 182 | /**  | 
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| 183 | * The property specifies the date and time that the information  | 
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| 184 | * associated with the calendar component was last revised.  | 
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| 185 | *  | 
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| 186 | * The value MUST be specified in the UTC time format.  | 
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| 187 | *  | 
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| 188 | * @var \DateTime  | 
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| 189 | */  | 
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| 190 | protected $modified;  | 
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| 191 | |||
| 192 | /**  | 
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| 193 | * Indicates if the UTC time should be used or not.  | 
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| 194 | *  | 
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| 195 | * @var bool  | 
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| 196 | */  | 
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| 197 | protected $useUtc = true;  | 
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| 198 | |||
| 199 | /**  | 
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| 200 | * @var bool  | 
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| 201 | */  | 
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| 202 | protected $cancelled;  | 
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| 203 | |||
| 204 | /**  | 
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| 205 | * This property is used to specify categories or subtypes  | 
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| 206 | * of the calendar component. The categories are useful in searching  | 
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| 207 | * for a calendar component of a particular type and category.  | 
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| 208 | *  | 
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| 209 | * @see https://tools.ietf.org/html/rfc5545#section-3.8.1.2  | 
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| 210 | *  | 
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| 211 | * @var array  | 
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| 212 | */  | 
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| 213 | protected $categories;  | 
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| 214 | |||
| 215 | /**  | 
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| 216 | * https://tools.ietf.org/html/rfc5545#section-3.8.1.3.  | 
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| 217 | *  | 
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| 218 | * @var bool  | 
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| 219 | */  | 
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| 220 | protected $isPrivate = false;  | 
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| 221 | |||
| 222 | /**  | 
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| 223 | * Dates to be excluded from a series of events.  | 
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| 224 | *  | 
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| 225 | * @var \DateTimeInterface[]  | 
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| 226 | */  | 
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| 227 | protected $exDates = [];  | 
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| 228 | |||
| 229 | /**  | 
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| 230 | * @var RecurrenceId  | 
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| 231 | */  | 
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| 232 | protected $recurrenceId;  | 
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| 233 | |||
| 234 | /**  | 
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| 235 | * @var Attachment[]  | 
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| 236 | */  | 
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| 237 | protected $attachments = [];  | 
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| 238 | |||
| 239 | 28 | public function __construct(string $uniqueId = null)  | 
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| 248 | |||
| 249 | /**  | 
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| 250 |      * {@inheritdoc} | 
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| 251 | */  | 
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| 252 | 7 | public function getType()  | 
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| 256 | |||
| 257 | /**  | 
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| 258 |      * {@inheritdoc} | 
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| 259 | */  | 
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| 260 | 18 | public function buildPropertyBag()  | 
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| 396 | |||
| 397 | /**  | 
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| 398 | * @param $dtEnd  | 
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| 399 | *  | 
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| 400 | * @return $this  | 
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| 401 | */  | 
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| 402 | 5 | public function setDtEnd($dtEnd)  | 
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| 408 | |||
| 409 | 2 | public function getDtEnd()  | 
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| 413 | |||
| 414 | 5 | public function setDtStart($dtStart)  | 
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| 420 | |||
| 421 | 2 | public function getDtStart()  | 
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| 425 | |||
| 426 | /**  | 
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| 427 | * @param $dtStamp  | 
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| 428 | *  | 
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| 429 | * @return $this  | 
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| 430 | */  | 
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| 431 | 1 | public function setDtStamp($dtStamp)  | 
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| 437 | |||
| 438 | /**  | 
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| 439 | * @param $duration  | 
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| 440 | *  | 
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| 441 | * @return $this  | 
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| 442 | */  | 
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| 443 | 1 | public function setDuration($duration)  | 
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| 449 | |||
| 450 | /**  | 
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| 451 | * @param string $location  | 
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| 452 | * @param string $title  | 
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| 453 | * @param Geo|string $geo  | 
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| 454 | *  | 
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| 455 | * @return $this  | 
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| 456 | */  | 
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| 457 | 3 | public function setLocation($location, $title = '', $geo = null)  | 
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| 475 | |||
| 476 | /**  | 
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| 477 | * @param Geo $geoProperty  | 
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| 478 | *  | 
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| 479 | * @return $this  | 
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| 480 | */  | 
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| 481 | 1 | public function setGeoLocation(Geo $geoProperty)  | 
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| 487 | |||
| 488 | /**  | 
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| 489 | * @param $noTime  | 
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| 490 | *  | 
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| 491 | * @return $this  | 
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| 492 | */  | 
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| 493 | 1 | public function setNoTime($noTime)  | 
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| 499 | |||
| 500 | /**  | 
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| 501 | * @param $msBusyStatus  | 
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| 502 | *  | 
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| 503 | * @return $this  | 
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| 504 | *  | 
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| 505 | * @throws \InvalidArgumentException  | 
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| 506 | */  | 
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| 507 | 2 | View Code Duplication | public function setMsBusyStatus($msBusyStatus)  | 
            
| 522 | |||
| 523 | /**  | 
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| 524 | * @return string|null  | 
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| 525 | */  | 
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| 526 | 1 | public function getMsBusyStatus()  | 
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| 530 | |||
| 531 | /**  | 
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| 532 | * @param int $sequence  | 
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| 533 | *  | 
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| 534 | * @return $this  | 
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| 535 | */  | 
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| 536 | 2 | public function setSequence($sequence)  | 
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| 542 | |||
| 543 | /**  | 
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| 544 | * @return int  | 
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| 545 | */  | 
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| 546 | 1 | public function getSequence()  | 
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| 550 | |||
| 551 | /**  | 
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| 552 | * @param Organizer $organizer  | 
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| 553 | *  | 
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| 554 | * @return $this  | 
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| 555 | */  | 
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| 556 | 2 | public function setOrganizer(Organizer $organizer)  | 
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| 562 | |||
| 563 | /**  | 
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| 564 | * @param $summary  | 
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| 565 | *  | 
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| 566 | * @return $this  | 
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| 567 | */  | 
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| 568 | 1 | public function setSummary($summary)  | 
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| 574 | |||
| 575 | /**  | 
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| 576 | * @param $uniqueId  | 
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| 577 | *  | 
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| 578 | * @return $this  | 
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| 579 | */  | 
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| 580 | 1 | public function setUniqueId($uniqueId)  | 
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| 586 | |||
| 587 | /**  | 
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| 588 | * @return string  | 
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| 589 | */  | 
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| 590 | 2 | public function getUniqueId()  | 
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| 594 | |||
| 595 | /**  | 
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| 596 | * @param $url  | 
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| 597 | *  | 
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| 598 | * @return $this  | 
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| 599 | */  | 
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| 600 | 1 | public function setUrl($url)  | 
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| 606 | |||
| 607 | /**  | 
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| 608 | * @param $useTimezone  | 
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| 609 | *  | 
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| 610 | * @return $this  | 
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| 611 | */  | 
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| 612 | public function setUseTimezone($useTimezone)  | 
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| 618 | |||
| 619 | /**  | 
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| 620 | * @return bool  | 
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| 621 | */  | 
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| 622 | public function getUseTimezone()  | 
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| 626 | |||
| 627 | /**  | 
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| 628 | * @param $timezoneString  | 
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| 629 | *  | 
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| 630 | * @return $this  | 
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| 631 | */  | 
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| 632 | 2 | public function setTimezoneString($timezoneString)  | 
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| 638 | |||
| 639 | /**  | 
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| 640 | * @return bool  | 
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| 641 | */  | 
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| 642 | 1 | public function getTimezoneString()  | 
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| 646 | |||
| 647 | /**  | 
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| 648 | * @param Attendees $attendees  | 
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| 649 | *  | 
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| 650 | * @return $this  | 
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| 651 | */  | 
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| 652 | public function setAttendees(Attendees $attendees)  | 
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| 658 | |||
| 659 | /**  | 
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| 660 | * @param string $attendee  | 
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| 661 | * @param array $params  | 
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| 662 | *  | 
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| 663 | * @return $this  | 
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| 664 | */  | 
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| 665 | public function addAttendee($attendee, $params = [])  | 
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| 671 | |||
| 672 | /**  | 
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| 673 | * @return Attendees  | 
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| 674 | */  | 
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| 675 | public function getAttendees(): Attendees  | 
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| 679 | |||
| 680 | /**  | 
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| 681 | * @param $description  | 
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| 682 | *  | 
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| 683 | * @return $this  | 
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| 684 | */  | 
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| 685 | 4 | public function setDescription($description)  | 
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| 691 | |||
| 692 | /**  | 
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| 693 | * @param $descriptionHTML  | 
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| 694 | *  | 
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| 695 | * @return $this  | 
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| 696 | */  | 
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| 697 | public function setDescriptionHTML($descriptionHTML)  | 
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| 703 | |||
| 704 | /**  | 
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| 705 | * @param bool $useUtc  | 
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| 706 | *  | 
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| 707 | * @return $this  | 
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| 708 | */  | 
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| 709 | public function setUseUtc($useUtc = true)  | 
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| 715 | |||
| 716 | /**  | 
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| 717 | * @return string  | 
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| 718 | */  | 
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| 719 | public function getDescription()  | 
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| 723 | |||
| 724 | /**  | 
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| 725 | * @return string  | 
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| 726 | */  | 
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| 727 | public function getDescriptionHTML()  | 
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| 731 | |||
| 732 | /**  | 
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| 733 | * @param $status  | 
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| 734 | *  | 
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| 735 | * @return $this  | 
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| 736 | */  | 
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| 737 | public function setCancelled($status)  | 
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| 743 | |||
| 744 | /**  | 
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| 745 | * @param $transparency  | 
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| 746 | *  | 
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| 747 | * @return $this  | 
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| 748 | *  | 
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| 749 | * @throws \InvalidArgumentException  | 
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| 750 | */  | 
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| 751 | View Code Duplication | public function setTimeTransparency($transparency)  | 
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| 764 | |||
| 765 | /**  | 
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| 766 | * @param $status  | 
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| 767 | *  | 
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| 768 | * @return $this  | 
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| 769 | *  | 
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| 770 | * @throws \InvalidArgumentException  | 
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| 771 | */  | 
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| 772 | View Code Duplication | public function setStatus($status)  | 
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| 786 | |||
| 787 | /**  | 
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| 788 | * @deprecated Deprecated since version 0.11.0, to be removed in 1.0. Use addRecurrenceRule instead.  | 
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| 789 | *  | 
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| 790 | * @param RecurrenceRule $recurrenceRule  | 
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| 791 | *  | 
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| 792 | * @return $this  | 
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| 793 | */  | 
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| 794 | public function setRecurrenceRule(RecurrenceRule $recurrenceRule)  | 
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| 802 | |||
| 803 | /**  | 
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| 804 | * @deprecated Deprecated since version 0.11.0, to be removed in 1.0. Use getRecurrenceRules instead.  | 
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| 805 | *  | 
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| 806 | * @return RecurrenceRule  | 
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| 807 | */  | 
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| 808 | public function getRecurrenceRule()  | 
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| 814 | |||
| 815 | /**  | 
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| 816 | * @param RecurrenceRule $recurrenceRule  | 
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| 817 | *  | 
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| 818 | * @return $this  | 
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| 819 | */  | 
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| 820 | public function addRecurrenceRule(RecurrenceRule $recurrenceRule)  | 
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| 826 | |||
| 827 | /**  | 
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| 828 | * @return array  | 
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| 829 | */  | 
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| 830 | public function getRecurrenceRules()  | 
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| 834 | |||
| 835 | /**  | 
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| 836 | * @param $dtStamp  | 
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| 837 | *  | 
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| 838 | * @return $this  | 
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| 839 | */  | 
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| 840 | public function setCreated($dtStamp)  | 
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| 846 | |||
| 847 | /**  | 
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| 848 | * @param $dtStamp  | 
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| 849 | *  | 
            ||
| 850 | * @return $this  | 
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| 851 | */  | 
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| 852 | public function setModified($dtStamp)  | 
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| 858 | |||
| 859 | /**  | 
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| 860 | * @param $categories  | 
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| 861 | *  | 
            ||
| 862 | * @return $this  | 
            ||
| 863 | */  | 
            ||
| 864 | public function setCategories($categories)  | 
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| 870 | |||
| 871 | /**  | 
            ||
| 872 | * Sets the event privacy.  | 
            ||
| 873 | *  | 
            ||
| 874 | * @param bool $flag  | 
            ||
| 875 | *  | 
            ||
| 876 | * @return $this  | 
            ||
| 877 | */  | 
            ||
| 878 | public function setIsPrivate($flag)  | 
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| 884 | |||
| 885 | /**  | 
            ||
| 886 | * @param \DateTimeInterface $dateTime  | 
            ||
| 887 | *  | 
            ||
| 888 | * @return \Eluceo\iCal\Component\Event  | 
            ||
| 889 | */  | 
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| 890 | public function addExDate(\DateTimeInterface $dateTime)  | 
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| 896 | |||
| 897 | /**  | 
            ||
| 898 | * @return \DateTimeInterface[]  | 
            ||
| 899 | */  | 
            ||
| 900 | public function getExDates()  | 
            ||
| 904 | |||
| 905 | /**  | 
            ||
| 906 | * @param \DateTimeInterface[]  | 
            ||
| 907 | *  | 
            ||
| 908 | * @return \Eluceo\iCal\Component\Event  | 
            ||
| 909 | */  | 
            ||
| 910 | public function setExDates(array $exDates)  | 
            ||
| 916 | |||
| 917 | /**  | 
            ||
| 918 | * @return \Eluceo\iCal\Property\Event\RecurrenceId  | 
            ||
| 919 | */  | 
            ||
| 920 | public function getRecurrenceId()  | 
            ||
| 924 | |||
| 925 | /**  | 
            ||
| 926 | * @param RecurrenceId $recurrenceId  | 
            ||
| 927 | *  | 
            ||
| 928 | * @return \Eluceo\iCal\Component\Event  | 
            ||
| 929 | */  | 
            ||
| 930 | public function setRecurrenceId(RecurrenceId $recurrenceId)  | 
            ||
| 936 | |||
| 937 | /**  | 
            ||
| 938 | * @param array $attachment  | 
            ||
| 939 | *  | 
            ||
| 940 | * @return $this  | 
            ||
| 941 | */  | 
            ||
| 942 | 1 | public function addAttachment(Attachment $attachment)  | 
            |
| 948 | |||
| 949 | /**  | 
            ||
| 950 | * @return array  | 
            ||
| 951 | */  | 
            ||
| 952 | public function getAttachments()  | 
            ||
| 956 | |||
| 957 | /**  | 
            ||
| 958 | * @param string $url  | 
            ||
| 959 | */  | 
            ||
| 960 | public function addUrlAttachment(string $url)  | 
            ||
| 964 | }  | 
            ||
| 965 |