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The dilemma arises because at some point in time a design has to commit to an implementation; however, it needs to balance the cost of commitment against the need for flexibility in a dynamic domain.

Figure 12-5. MyGeneration, a free code-generation tool After you have generated the code for EntitySpaces (and again I am not going to go through all the details because you can go to the web site for help getting started), you basically have a complete data access layer. Listing 12-3 is an abridged version of the metadata used by EntitySpaces to work with a Department entity. As you can see, in this example a partial class called DepartmentMetadata is created to handle the mapping from entity to database. The constructor creates esColumnMetadata and a portion of the esDefault method, which builds the mapping used by the EntitySpaces engine.

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The next two methods, keyOf and hasValue, are trickier. Since they operate on values rather than keys, we have no way to directly access them through our storage object. What we need to do is to use a traversal loop to go through each of the items in our storage and compare their value with the argument. The hasValue method is easier to implement, since we ll simply have to check if the particular value exists in our storage object, regardless of which key is associated with it: Table.implement({ hasValue: function(value){ var storage = this.$storage; for (var key in storage){ if (storage[key] === value) return true; } return false; } }); Inside our hasValue method, we loop through each item in the storage object using a for-in loop. For every item we go through, we compare the value of the item with the value argument passed to our method. If we get a match, we immediately halt execution of the function by returning true. If the loop finishes without finding any matches, we fall back to a return value of false. The keyOf method is similar to the hasValue method, but instead of returning a boolean, we return the actual key associated with the object, or null if there s no such key: Table.implement({ keyOf: function(value){ var storage = this.$storage; for (var key in storage){ if (storage[key] === value) return key; } return null; } });

A key to the dilemma lies in using polymorphism, which enables an object to be treated as an object (implementation) or as a member of its type (interface) at run time. Polymorphism preserves flexibility after an interface has committed to an implementation. The solution is articulated by GoF in a principle: Program to an interface, not an implementation. 2 It works like this: a variable is declared as an abstract class or type (e.g., Mammal) and instantiated as a given subclass (e.g., Dog) of the type: Mammal majorBarker = new Dog(); rather than Dog majorBarker = new Dog(); This aids flexibility because it enables the object (majorBarker) to be referenced as an implementation (Dog) or through its interface (Mammal). Additionally, the concrete class (Dog) may be substituted by any class of the same type, for example, by a quiet Cat.

We re almost done with our Table type, but we need to implement a couple more methods. Thankfully, they re all similar to our previous item-traversing functions, so it will be very easy to implement them. Two of the methods we still need to implement are keys and values, which deal with the keys and the values as groups. The keys method returns all the keys of the items in a table, while the values method returns the values of these items: Table.implement({ keys: function(){ var storage = this.$storage; var results = []; for (var key in storage) results.push(key); return results; },

Caution Listing 12-3 is not the complete set of metadata code used by EntitySpaces. This example is

The Standard: Object Collaboration (Abstraction-Implementation Dichotomy)

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