Php simple factory mode example php design mode Getting Started Tutorial

Php simple factory mode example php design mode Getting Started Tutorial

/** * Example * * A farm needs to sell fruit to the market * There are three types of fruits, apples, and grapes on the farm. * Our ideas: 1. fruits have multiple attributes, each of which is different. However, they share a common place. | growth, planting, receiving, and eating * 2. new fruits may be added in the future. we need to define an interface to standardize the methods they must implement. * 3. we need to get a fruit class. we need to get an instance of a fruit from a farmer to know how to grow, plant, receive, and eat it. */ /** * Virtual product interface * Define the implementation methods. */ Interface fruit { /** * Growth */ Public function grow (); /** * Planting */ Public function plant (); /** * Gains */ Public function harvest (); /** * Eat */ Public function eat (); } /** * Define specific product categories for Apple * First, we need to implement the methods defined by the inherited interfaces. * Then define Apple's unique attributes and methods */ Class apple implements fruit { // Apple tree has an age Private $ treeAge; // Apple Color Private $ color; Public function grow (){ Echo "grape grow "; } Public function plant (){ Echo "grape plant "; } Public function harvest (){ Echo "grape harvest "; } Public function eat (){ Echo "grape eat "; } // The age of the apple tree Public function getTreeAge (){ Return $ this-> treeAge; } // Set the apple tree age Public function setTreeAge ($ age ){ $ This-> treeAge = $ age; Return trie; } } /** * Define specific products * First, we need to implement the methods defined by the inherited interfaces. * Then define the unique attributes and methods of grapes. */ Class grape implements fruit { // Check whether grapes have seeds Private $ seedLess; Public function grow (){ Echo "apple grow "; } Public function plant (){ Echo "apple plant "; } Public function harvest (){ Echo "apple harvest "; } Public function eat (){ Echo "apple eat "; } // Seed values Public function getSeedLess (){ Return $ this-> seedLess; } // Set seedless Public function setSeedLess ($ seed ){ $ This-> seedLess = $ seed; Return true; } } /** * The farmer class is used to obtain the instantiated fruit. * */ Class farmer { // Define a static factory method Public static function factory ($ fruitName ){ Switch ($ fruitName ){ Case 'apple ': Return new apple (); Break; Case 'grape ': Return new grape (); Break; Default: Throw new badFruitException ("Error no the fruit", 1 ); Break; } } } Class badFruitException extends Exception { Public $ msg; Public $ errType; Public function _ construct ($ msg = '', $ errType = 1 ){ $ This-> msg = $ msg; $ This-> errType = $ errType; } } /** * Method for obtaining fruit instantiation */ Try { $ AppleInstance = farmer: factory ('apple '); Var_dump ($ appleInstance ); } Catch (badFruitException $ err ){ Echo $ err-> msg. "_______". $ err-> errType; }