Lets take a look at the code samples I created as below.<\/p>\n\n\n\n
PHP Code Sample<\/h3>\n\n\n\n<?php\n\n\/**\n * This is the original application interface \n * where we place the methods need to develop from its concrete sub classes\n *\/\ninterface ApplicationInterface\n{\n public function setDbDriver(DbDriver $dbDriver);\n \n public function query($query);\n}\n\n\/**\n * This abstract class will implements the interface as we have to reference the next hierarchy object here.\n * After that we can access the methods of their sub concrete classes in our sub classes. see below.\n *\/\nabstract class Application implements ApplicationInterface\n{\n protected $dbDriver;\n \n public function setDbDriver(DbDriver $dbDriver)\n {\n $this->dbDriver = $dbDriver;\n }\n}\n\n\/**\n* Concrete sub classes of the original class working with the reference object's method.\n*\/\nclass android extends Application\n{\n public function query($query)\n {\n $query .= \"\\n\\n running android app query\\n\";\n \n return $this->dbDriver->handleQuery($query);\n }\n}\n \nclass ios extends Application\n{\n public function query($query)\n {\n $query .= \"\\n\\n running ios app query\\n\";\n \n return $this->dbDriver->handleQuery($query);\n }\n}\n\n\n\/**\n* This is the interface that need to be referenced by original class instead of inheritance.\n*\/\ninterface DbDriver\n{\n public function handleQuery($query);\n}\n\n\/**\n* Concrete classes that will have the detail implementations of the interface.\n*\/\nclass MysqlDriver implements DbDriver\n{\n public function handleQuery($query)\n {\n echo \"\\nUsing the mysql driver: \".$query;\n }\n}\n \n \nclass OracleDriver implements DbDriver\n{\n public function handleQuery($query)\n {\n echo \"\\nUsing the oracle driver: \".$query;\n }\n}\n\n\n\/\/client code\n\/\/ client doesn't need to know any implementation details. \n\/\/ Just build the original concrete class and inject the concrete object that will be referenced.\n \n$android = new android();\n$android->setDbDriver(new MysqlDriver());\necho $android->query(\"select * from table\");\n \n$android->setDbDriver(new OracleDriver());\necho $android->query(\"select * from table\");\n \n\n$ios = new ios();\n$ios->setDbDriver(new MysqlDriver());\necho $ios->query(\"select * from table\");\n\n$ios->setDbDriver(new OracleDriver());\necho $ios->query(\"select * from table\");\n \n<\/code><\/pre>\n\n\n\nC# Code Sample<\/h3>\n\n\n\nusing System;\nusing System.Collections.Generic;\n\nnamespace HelloWorld\n{\n \/**\n * Two Original classes referencing the same DbDriver which is the next hierarchy object\n * After that we can access the methods of their sub concrete classes in our sub classes. query method in this case\n *\/\n class ApplicationInterface\n {\n protected DbDriver _dbdriver;\n\n public ApplicationInterface(DbDriver dbdriver)\n {\n this._dbdriver = dbdriver;\n }\n\n public virtual string setDbDriver()\n {\n return \"Base DB Driver:\" +\n _dbdriver.query();\n }\n }\n\n class RefinedAbstraction : ApplicationInterface\n {\n public RefinedAbstraction(DbDriver dbdriver) : base(dbdriver)\n {\n }\n\n public override string setDbDriver()\n {\n return \"Refined DB Driver:\" +\n base._dbdriver.query();\n }\n }\n\n\n \/**\n * This is the interface that need to be referenced by original class instead of inheritance.\n *\/\n public interface DbDriver \n {\n string query();\n }\n\n \/**\n * Concrete classes that will have the detail implementations of the interface.\n *\/\n class MysqlDriver : DbDriver \n {\n public string query()\n {\n return \"Using the mysql driver:\\n\";\n }\n }\n\n class OracleDriver : DbDriver \n {\n public string query()\n {\n return \"Using the oracle driver:.\\n\";\n }\n }\n\n \/\/ client doesn't need to know any implementation details. \n \/\/ Just build the original class and inject the concrete object that will be referenced.\n class Client\n {\n public void ClientCode(ApplicationInterface applicationInterface)\n {\n Console.Write(applicationInterface.setDbDriver());\n }\n }\n\n class Program\n {\n static void Main(string[] args)\n {\n Client client = new Client();\n\n ApplicationInterface applicationInterface;\n\n applicationInterface = new ApplicationInterface(new MysqlDriver());\n client.ClientCode(applicationInterface);\n\n Console.WriteLine();\n\n applicationInterface = new RefinedAbstraction(new OracleDriver());\n client.ClientCode(applicationInterface);\n }\n }\n\n}\n<\/code><\/pre>\n\n\n\n
<?php\n\n\/**\n * This is the original application interface \n * where we place the methods need to develop from its concrete sub classes\n *\/\ninterface ApplicationInterface\n{\n public function setDbDriver(DbDriver $dbDriver);\n \n public function query($query);\n}\n\n\/**\n * This abstract class will implements the interface as we have to reference the next hierarchy object here.\n * After that we can access the methods of their sub concrete classes in our sub classes. see below.\n *\/\nabstract class Application implements ApplicationInterface\n{\n protected $dbDriver;\n \n public function setDbDriver(DbDriver $dbDriver)\n {\n $this->dbDriver = $dbDriver;\n }\n}\n\n\/**\n* Concrete sub classes of the original class working with the reference object's method.\n*\/\nclass android extends Application\n{\n public function query($query)\n {\n $query .= \"\\n\\n running android app query\\n\";\n \n return $this->dbDriver->handleQuery($query);\n }\n}\n \nclass ios extends Application\n{\n public function query($query)\n {\n $query .= \"\\n\\n running ios app query\\n\";\n \n return $this->dbDriver->handleQuery($query);\n }\n}\n\n\n\/**\n* This is the interface that need to be referenced by original class instead of inheritance.\n*\/\ninterface DbDriver\n{\n public function handleQuery($query);\n}\n\n\/**\n* Concrete classes that will have the detail implementations of the interface.\n*\/\nclass MysqlDriver implements DbDriver\n{\n public function handleQuery($query)\n {\n echo \"\\nUsing the mysql driver: \".$query;\n }\n}\n \n \nclass OracleDriver implements DbDriver\n{\n public function handleQuery($query)\n {\n echo \"\\nUsing the oracle driver: \".$query;\n }\n}\n\n\n\/\/client code\n\/\/ client doesn't need to know any implementation details. \n\/\/ Just build the original concrete class and inject the concrete object that will be referenced.\n \n$android = new android();\n$android->setDbDriver(new MysqlDriver());\necho $android->query(\"select * from table\");\n \n$android->setDbDriver(new OracleDriver());\necho $android->query(\"select * from table\");\n \n\n$ios = new ios();\n$ios->setDbDriver(new MysqlDriver());\necho $ios->query(\"select * from table\");\n\n$ios->setDbDriver(new OracleDriver());\necho $ios->query(\"select * from table\");\n \n<\/code><\/pre>\n\n\n\nC# Code Sample<\/h3>\n\n\n\nusing System;\nusing System.Collections.Generic;\n\nnamespace HelloWorld\n{\n \/**\n * Two Original classes referencing the same DbDriver which is the next hierarchy object\n * After that we can access the methods of their sub concrete classes in our sub classes. query method in this case\n *\/\n class ApplicationInterface\n {\n protected DbDriver _dbdriver;\n\n public ApplicationInterface(DbDriver dbdriver)\n {\n this._dbdriver = dbdriver;\n }\n\n public virtual string setDbDriver()\n {\n return \"Base DB Driver:\" +\n _dbdriver.query();\n }\n }\n\n class RefinedAbstraction : ApplicationInterface\n {\n public RefinedAbstraction(DbDriver dbdriver) : base(dbdriver)\n {\n }\n\n public override string setDbDriver()\n {\n return \"Refined DB Driver:\" +\n base._dbdriver.query();\n }\n }\n\n\n \/**\n * This is the interface that need to be referenced by original class instead of inheritance.\n *\/\n public interface DbDriver \n {\n string query();\n }\n\n \/**\n * Concrete classes that will have the detail implementations of the interface.\n *\/\n class MysqlDriver : DbDriver \n {\n public string query()\n {\n return \"Using the mysql driver:\\n\";\n }\n }\n\n class OracleDriver : DbDriver \n {\n public string query()\n {\n return \"Using the oracle driver:.\\n\";\n }\n }\n\n \/\/ client doesn't need to know any implementation details. \n \/\/ Just build the original class and inject the concrete object that will be referenced.\n class Client\n {\n public void ClientCode(ApplicationInterface applicationInterface)\n {\n Console.Write(applicationInterface.setDbDriver());\n }\n }\n\n class Program\n {\n static void Main(string[] args)\n {\n Client client = new Client();\n\n ApplicationInterface applicationInterface;\n\n applicationInterface = new ApplicationInterface(new MysqlDriver());\n client.ClientCode(applicationInterface);\n\n Console.WriteLine();\n\n applicationInterface = new RefinedAbstraction(new OracleDriver());\n client.ClientCode(applicationInterface);\n }\n }\n\n}\n<\/code><\/pre>\n\n\n\n
![\"\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0\"](\"\/\/b.hatena.ne.jp\/images\/entry-button\/button-only@2x.png\")
<\/a>