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However, this is really nothing to do with object orientation at all, but rather the normal non object-oriented dereferencing operator Perl uses it for object orientation so that we can think of dereferencing an object in terms of accessing an object s public data In other words, it is a syntactic trick to help keep us thinking in object-oriented terms, even though we are not actually performing an object-oriented operation at heart One major disadvantage of accessing an object s data directly is that we break the interface defined by the object class The class has no ability to control how we access the object s data; neither can it spot attempts to access invalid properties or set invalid values Worse, it breaks the rules of good object-oriented programming, because our code is now dependent on this implementation detail.

If the object implementation changes to use an array instead of a hash, or simply renames the keys it uses, our code will break It is better to use methods defined by the class to access and store properties on its objects whenever possible (These methods are called accessors and mutators in object-oriented parlance) The object should be an abstract opaque data type..

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One exception to this rule is for performance reasons, when object methods that do no more than return a property value are called very frequently consider an object class that manages sets of other objects numbering in the thousands. In this case, accessing the property through the hash key saves much time by avoiding thousands of method calls to an accessor method. However, such use of a class should be documented by the programmer to indicate that direct access is valid for the nominated key, and that the name of the property will not change that is, the name of the hash key is part of the documented interface of the class. This guarantee does not have to extend to all properties of the class, just those for which direct access is desirable.

Indeed, there are a number of code generation tools that can automate this exact process, such as Brian Rinaldi s Illudium PU-36 Code Generator (http://cfcgeneratorriaforgeorg/) Even though you can t entirely automate the creation of your Service and Controller Objects, the rules for naming each layer are fairly straightforward: a Something bean, SomethingDAO, SomethingGateway, SomethingService, and SomethingController The most obvious downside to this recipe is that it creates a lot of objects, and, to the novice, it can look like an awful lot of work to do something that used to be so simple (It wasn t really so simple, but it was something we were used to) I ve started referring to this recipe as the 5:1 Syndrome because you typically have five objects for every database table.

A class method is a subroutine defined in the class, which operates on a class as a whole, rather than a specific object of that class. The most common type of class method is a constructor, which asks the class to create a new instance of an object, but any method that performs a function on behalf of the class, such as setting a piece of global information (that is, class data) used by all instances of the class, is a class method too. To call a class method, we use the -> operator on the package name of the class, which we give as a bare, unquoted string, just as we do with use: $result = My::Object::Class->classmethod(@args); The inverted syntax we used before will also work with any other class method. The preceding statement can again be rewritten to the equivalent: $result = classmethod My::Object::Class(@args); Although universally applicable, this syntax should only be used for constructors, where its ordering makes logical sense. (Think of constructors with names like cloned, cached, or encoded for an idea of how classes with multiple constructors can take advantage of this syntax.) The subroutine that implements the class method is called with the arguments supplied by us, plus the package name, which is passed first. In other words, this class method call and the following subroutine call are handled similarly for classes that do not inherit: # method call - correct object-oriented syntax My::Class->method(@args); # subroutine call - does not handle inheritance My::Class::method('My::Class', @args);

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