Complex classes like EcommerceDBConfig 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 EcommerceDBConfig, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 13 | class EcommerceDBConfig extends DataObject implements EditableEcommerceObject  | 
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| 14 | { | 
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| 15 | /**  | 
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| 16 | * Standard SS Variable.  | 
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| 17 | *  | 
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| 18 | * @var array  | 
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| 19 | */  | 
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| 20 | private static $db = array(  | 
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| 21 | 'Title' => 'Varchar(30)',  | 
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| 22 | 'UseThisOne' => 'Boolean',  | 
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| 23 | 'ShopClosed' => 'Boolean',  | 
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| 24 | 'ShopPricesAreTaxExclusive' => 'Boolean',  | 
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| 25 | 'InvoiceTitle' => 'Varchar(200)',  | 
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| 26 | 'PackingSlipTitle' => 'Varchar(200)',  | 
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| 27 | 'PackingSlipNote' => 'HTMLText',  | 
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| 28 | 'ShopPhysicalAddress' => 'HTMLText',  | 
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| 29 | 'ReceiptEmail' => 'Varchar(255)',  | 
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| 30 | 'PostalCodeURL' => 'Varchar(255)',  | 
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| 31 | 'PostalCodeLabel' => 'Varchar(255)',  | 
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| 32 | 'NumberOfProductsPerPage' => 'Int',  | 
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| 33 | 'ProductsAlsoInOtherGroups' => 'Boolean',  | 
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| 34 | 'OnlyShowProductsThatCanBePurchased' => 'Boolean',  | 
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| 35 | 'NotForSaleMessage' => 'HTMLText',  | 
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| 36 | 'ProductsHaveWeight' => 'Boolean',  | 
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| 37 | 'ProductsHaveModelNames' => 'Boolean',  | 
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| 38 | 'ProductsHaveQuantifiers' => 'Boolean',  | 
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| 39 | //"ProductsHaveVariations" => "Boolean",  | 
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| 40 | 'CurrenciesExplanation' => 'HTMLText',  | 
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| 41 | 'AllowFreeProductPurchase' => 'Boolean',  | 
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| 42 | );  | 
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| 43 | |||
| 44 | /**  | 
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| 45 | * Standard SS Variable.  | 
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| 46 | *  | 
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| 47 | * @var array  | 
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| 48 | */  | 
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| 49 | private static $has_one = array(  | 
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| 50 | 'EmailLogo' => 'Image',  | 
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| 51 | 'DefaultProductImage' => 'Product_Image',  | 
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| 52 | );  | 
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| 53 | |||
| 54 | /**  | 
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| 55 | * Standard SS Variable.  | 
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| 56 | *  | 
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| 57 | * @var array  | 
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| 58 | */  | 
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| 59 | private static $indexes = array(  | 
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| 60 | 'UseThisOne' => true,  | 
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| 61 | 'ShopClosed' => true,  | 
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| 62 | 'ShopPricesAreTaxExclusive' => true,  | 
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| 63 | 'NumberOfProductsPerPage' => true,  | 
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| 64 | 'OnlyShowProductsThatCanBePurchased' => true,  | 
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| 65 | );  | 
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| 66 | |||
| 67 | /**  | 
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| 68 | * Standard SS Variable.  | 
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| 69 | *  | 
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| 70 | * @var array  | 
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| 71 | */  | 
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| 72 | private static $casting = array(  | 
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| 73 | 'UseThisOneNice' => 'Varchar',  | 
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| 74 | ); //adds computed fields that can also have a type (e.g.  | 
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| 75 | |||
| 76 | /**  | 
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| 77 | * Standard SS Variable.  | 
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| 78 | *  | 
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| 79 | * @var array  | 
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| 80 | */  | 
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| 81 | private static $searchable_fields = array(  | 
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| 82 | 'Title' => 'PartialMatchFilter',  | 
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| 83 | );  | 
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| 84 | |||
| 85 | /**  | 
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| 86 | * Standard SS Variable.  | 
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| 87 | *  | 
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| 88 | * @var array  | 
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| 89 | */  | 
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| 90 | private static $field_labels = array();  | 
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| 91 | |||
| 92 | /**  | 
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| 93 | * Standard SS Variable.  | 
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| 94 | *  | 
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| 95 | * @var array  | 
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| 96 | */  | 
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| 97 | private static $summary_fields = array(  | 
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| 98 | 'Title' => 'Title',  | 
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| 99 | 'UseThisOneNice' => 'Use this configuration set',  | 
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| 100 | ); //note no => for relational fields  | 
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| 101 | |||
| 102 | /**  | 
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| 103 | * Standard SS Method.  | 
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| 104 | *  | 
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| 105 | * @param Member $member  | 
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| 106 | *  | 
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| 107 | * @var bool  | 
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| 108 | */  | 
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| 109 | public function canCreate($member = null)  | 
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| 121 | |||
| 122 | /**  | 
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| 123 | * Standard SS Method.  | 
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| 124 | *  | 
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| 125 | * @param Member $member  | 
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| 126 | *  | 
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| 127 | * @var bool  | 
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| 128 | */  | 
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| 129 | public function canView($member = null)  | 
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| 141 | |||
| 142 | /**  | 
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| 143 | * Standard SS Method.  | 
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| 144 | *  | 
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| 145 | * @param Member $member  | 
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| 146 | *  | 
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| 147 | * @var bool  | 
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| 148 | */  | 
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| 149 | public function canEdit($member = null)  | 
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| 164 | |||
| 165 | /**  | 
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| 166 | * Standard SS Method.  | 
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| 167 | *  | 
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| 168 | * @param Member $member  | 
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| 169 | *  | 
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| 170 | * @var bool  | 
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| 171 | */  | 
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| 172 | public function canDelete($member = null)  | 
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| 191 | |||
| 192 | /**  | 
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| 193 | * Standard SS variable.  | 
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| 194 | *  | 
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| 195 | * @var string  | 
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| 196 | */  | 
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| 197 | private static $default_sort = '"UseThisOne" DESC, "Created" ASC';  | 
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| 198 | |||
| 199 | /**  | 
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| 200 | * Standard SS variable.  | 
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| 201 | *  | 
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| 202 | * @var array  | 
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| 203 | */  | 
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| 204 | private static $defaults = array(  | 
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| 205 | 'Title' => 'Ecommerce Site Config',  | 
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| 206 | 'UseThisOne' => true,  | 
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| 207 | 'ShopClosed' => false,  | 
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| 208 | 'ShopPricesAreTaxExclusive' => false,  | 
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| 209 | 'InvoiceTitle' => 'Invoice',  | 
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| 210 | 'PackingSlipTitle' => 'Package Contents',  | 
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| 211 | 'PackingSlipNote' => 'Please make sure that all items are contained in this package.',  | 
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| 212 | 'ShopPhysicalAddress' => '<p>Enter your shop address here.</p>',  | 
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| 213 | //"ReceiptEmail" => "Varchar(255)", - see populate defaults  | 
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| 214 | 'PostalCodeURL' => '',  | 
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| 215 | 'PostalCodeLabel' => '',  | 
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| 216 | 'NumberOfProductsPerPage' => 12,  | 
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| 217 | 'ProductsAlsoInOtherGroups' => false,  | 
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| 218 | 'OnlyShowProductsThatCanBePurchased' => false,  | 
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| 219 | 'NotForSaleMessage' => '<p>Not for sale, please contact us for more information.</p>',  | 
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| 220 | 'ProductsHaveWeight' => false,  | 
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| 221 | 'ProductsHaveModelNames' => false,  | 
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| 222 | 'ProductsHaveQuantifiers' => false,  | 
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| 223 | //"ProductsHaveVariations" => false,  | 
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| 224 | 'CurrenciesExplanation' => '<p>Apart from our main currency, you can view prices in a number of other currencies. The exchange rate is indicative only.</p>',  | 
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| 225 | 'AllowFreeProductPurchase' => true,  | 
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| 226 | );  | 
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| 227 | |||
| 228 | /**  | 
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| 229 | * Standard SS Method.  | 
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| 230 | *  | 
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| 231 | * @var array  | 
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| 232 | */  | 
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| 233 | public function populateDefaults()  | 
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| 238 | |||
| 239 | /**  | 
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| 240 | * Standard SS variable.  | 
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| 241 | *  | 
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| 242 | * @var string  | 
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| 243 | */  | 
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| 244 | private static $singular_name = 'Main E-commerce Configuration';  | 
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| 245 | public function i18n_singular_name()  | 
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| 249 | |||
| 250 | /**  | 
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| 251 | * Standard SS variable.  | 
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| 252 | *  | 
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| 253 | * @var string  | 
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| 254 | */  | 
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| 255 | private static $plural_name = 'Main E-commerce Configurations';  | 
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| 256 | public function i18n_plural_name()  | 
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| 260 | |||
| 261 | /**  | 
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| 262 | * Standard SS variable.  | 
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| 263 | *  | 
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| 264 | * @var string  | 
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| 265 | */  | 
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| 266 | private static $description = 'A set of configurations for the shop. Each shop needs to have one or more of these settings.';  | 
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| 267 | |||
| 268 | /**  | 
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| 269 | * static holder for its own (or other EcommerceDBConfig) class.  | 
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| 270 | *  | 
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| 271 | * @var string | NULL  | 
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| 272 | */  | 
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| 273 | private static $_my_current_one = null;  | 
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| 274 | public static function reset_my_current_one()  | 
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| 278 | |||
| 279 | /**  | 
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| 280 | * implements singleton pattern.  | 
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| 281 | * Gets the current USE THIS ONE e-commerce option.  | 
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| 282 | *  | 
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| 283 | * @return EcommerceDBConfig | Object  | 
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| 284 | */  | 
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| 285 | public static function current_ecommerce_db_config()  | 
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| 301 | |||
| 302 | /**  | 
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| 303 | * standard SS method for decorators.  | 
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| 304 | *  | 
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| 305 | * @param bool $includerelations  | 
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| 306 | *  | 
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| 307 | * @return array  | 
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| 308 | */  | 
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| 309 | public function fieldLabels($includerelations = true)  | 
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| 323 | |||
| 324 | /**  | 
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| 325 | * definition of field lables  | 
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| 326 | * TODO: is this a common SS method?  | 
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| 327 | *  | 
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| 328 | * @return array  | 
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| 329 | */  | 
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| 330 | public function customFieldLabels()  | 
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| 364 | |||
| 365 | /**  | 
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| 366 | * definition of field lables  | 
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| 367 | * TODO: is this a common SS method?  | 
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| 368 | *  | 
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| 369 | * @return array  | 
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| 370 | */  | 
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| 371 | public function customDescriptionsForFields()  | 
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| 387 | |||
| 388 | /**  | 
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| 389 | * standard SS method.  | 
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| 390 | *  | 
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| 391 | * @return FieldList  | 
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| 392 | */  | 
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| 393 | public function getCMSFields()  | 
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| 521 | |||
| 522 | /**  | 
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| 523 | * link to edit the record.  | 
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| 524 | *  | 
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| 525 | * @param string | Null $action - e.g. edit  | 
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| 526 | *  | 
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| 527 | * @return string  | 
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| 528 | */  | 
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| 529 | public function CMSEditLink($action = null)  | 
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| 537 | |||
| 538 | public function getOrderStepsField()  | 
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| 552 | |||
| 553 | /**  | 
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| 554 | * tells us if a Class Name is a buyable.  | 
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| 555 | *  | 
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| 556 | * @todo: consider using Ecomerce Configuration instead?  | 
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| 557 | * In EcomConfig we only list base classes.  | 
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| 558 | *  | 
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| 559 | * @param string $className - name of the class to be tested  | 
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| 560 | *  | 
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| 561 | * @return bool  | 
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| 562 | */  | 
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| 563 | public static function is_buyable($className)  | 
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| 572 | |||
| 573 | /**  | 
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| 574 | * Returns the Current Member.  | 
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| 575 | */  | 
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| 576 | public function Customer()  | 
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| 580 | |||
| 581 | /**  | 
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| 582 | * Returns the Current Member.  | 
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| 583 | */  | 
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| 584 | public function CustomerForOrder()  | 
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| 590 | |||
| 591 | /**  | 
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| 592 | * Return the currency being used on the site e.g. "NZD" or "USD".  | 
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| 593 | *  | 
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| 594 | * @return string  | 
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| 595 | */  | 
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| 596 | public function Currency()  | 
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| 600 | |||
| 601 | /**  | 
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| 602 | * return null if there is less than two currencies in use  | 
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| 603 | * on the site.  | 
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| 604 | *  | 
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| 605 | * @return DataList | Null  | 
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| 606 | */  | 
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| 607 | public function Currencies()  | 
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| 614 | |||
| 615 | /**  | 
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| 616 | * @return string (URLSegment)  | 
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| 617 | **/  | 
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| 618 | public function AccountPageLink()  | 
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| 622 | |||
| 623 | /**  | 
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| 624 | * @return string (URLSegment)  | 
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| 625 | **/  | 
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| 626 | public function CheckoutLink()  | 
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| 630 | |||
| 631 | /**  | 
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| 632 | *@return string (URLSegment)  | 
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| 633 | **/  | 
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| 634 | public function CartPageLink()  | 
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| 638 | |||
| 639 | /**  | 
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| 640 | *@return string (URLSegment)  | 
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| 641 | **/  | 
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| 642 | public function OrderConfirmationPageLink()  | 
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| 646 | |||
| 647 | /**  | 
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| 648 | * Returns a link to a default image.  | 
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| 649 | * If a default image is set in the site config then this link is returned  | 
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| 650 | * Otherwise, a standard link is returned.  | 
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| 651 | *  | 
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| 652 | * @return string  | 
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| 653 | */  | 
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| 654 | public function DefaultImageLink()  | 
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| 665 | |||
| 666 | /**  | 
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| 667 | * Returns the default image or a dummy one if it does not exists.  | 
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| 668 | *  | 
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| 669 | * @return string  | 
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| 670 | */  | 
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| 671 | public function DefaultImage()  | 
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| 686 | |||
| 687 | /**  | 
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| 688 | * standard SS method.  | 
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| 689 | */  | 
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| 690 | public function onAfterWrite()  | 
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| 713 | |||
| 714 | /**  | 
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| 715 | * standard SS Method.  | 
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| 716 | */  | 
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| 717 | public function requireDefaultRecords()  | 
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| 731 | |||
| 732 | /**  | 
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| 733 | * returns site config.  | 
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| 734 | *  | 
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| 735 | * @return SiteConfig  | 
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| 736 | */  | 
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| 737 | public function SiteConfig()  | 
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| 741 | |||
| 742 | /**  | 
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| 743 | * Casted Variable.  | 
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| 744 | *  | 
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| 745 | * @return string  | 
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| 746 | */  | 
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| 747 | public function UseThisOneNice()  | 
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| 751 | }  | 
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| 752 | 
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.