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Choosing when and how to fail is one of the big debates in software development. There is a lot of consensus about what we do, but things are much less clear-cut when it comes to failures.

You have a number of choices: 1. Try to plow on regardless. 2. Try to make sense of what has happened and work around it. 3. Return an error of some kind to your caller, and hope the caller knows what to do with it. 4. Stop. At the moment, we re using option 1: try to plow on regardless; and you can see that this might or might not be dangerous. The difficulty is that we can be sure it is safe only if we know why our client is calling us. Given that we can t possibly have knowledge of the continuum of all possible clients (and their clients, and their clients clients), plugging on regardless is, in general, not safe. We might be exposing ourselves to all sorts of security problems and data integrity issues of which we cannot be aware at this time. What about option 2 Well, that is really an extension of the contract: we re saying that particular types of data outside the range we previously defined are valid, it is just that we ll special-case them to other values. This is quite common with range properties, where we clamp values outside the range to the minimum and maximum permitted values. Example 6-5 shows how we could implement that.

class Turtle { // The width of the platform must be between 1.0 and 10.0 inclusive // Values outside this range will be coerced into the range. private double platformWidth; public double PlatformWidth { get { return platformWidth; } set { platformWidth = value; EnsurePlatformSize(); } } // The height of the platform must be between 1.0 and 10.0 inclusive // Values outside this range will be coerced into the range. private double platformHeight; public double PlatformHeight { get { return platformHeight; } set { platformHeight = value; EnsurePlatformSize(); } }

// The new constructor initializes the platform size appropriately public Turtle() { EnsurePlatformSize(); } // This method enforces the newly documented constraint // we added to the contract private void EnsurePlatformSize() { if (PlatformWidth < 1.0) { PlatformWidth = 1.0; } if (PlatformWidth > 10.0) { PlatformWidth = 10.0; } if (PlatformHeight < 1.0) { PlatformHeight = 1.0; } if (PlatformHeight > 10.0) { PlatformHeight = 10.0; } } // ...

The appropriate accessor is called implicitly depending on whether you are writing to or reading from the property. You cannot explicitly call the accessors. Attempting to do so produces a compile error. y = MyValue.get(); MyValue.set(5); // Wrong! Can't explicitly call get accessor. // Wrong! Can't explicitly call set accessor.

}

Interaction with client components shouldn t happen until the load event of the client page lifecycle is raised. Only when the load event is raised is everything hooked up and ready.

Here we documented a constraint in our contract, and enforced that constraint first at construction, and then whenever clients attempt to modify the value. We chose to enforce that constraint at the point when the value can be changed because that makes the effect of the constraint directly visible. If users set an out-of-bounds value and read it back they can immediately see the effect of the constraint on the property. That s not the only choice, of course. We could have done it just before we used it but if we changed the implementation, or added features, we might have to add lots of calls to EnsurePlatformSize, and you can be certain that we d forget one somewhere. When we run the application again, we see the following output:

Arthur Arthur Arthur Arthur Arthur Arthur is is is is is is at at at at at at (0,0) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 15.71 radians. (-1.53075794227797E-14,35) and is pointing at angle 15.71 radians. (-1.53075794227797E-14,35) and is pointing at angle 7.85 radians. (-3.53553390593275,35) and is pointing at angle 7.85 radians.

Although this is a very useful technique, and it has clearly banished those less-thanuseful NaNs, we have to consider: is this the right solution for this particular problem Let s think about our tennis-court-painting robot again. Would we really want it to

paint the court as though it were a 1-meter-wide robot, just because we forgot to initialize it Looking at the distances traveled and the angles through which it has turned, the answer is clearly no!

A property is often associated with a field. A common practice is to encapsulate a field in a class by declaring it private, and declaring a public property to give controlled access to the field from outside the class. For example, the following code uses the public property MyValue to give controlled access to private field TheRealValue. class C1 { private public { set{ get{ } }

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