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{ public void doValidation() { Console.Write("The cat jumped over the bin."); Console.Write(MyValidationClass.validateAll("The cat jumped over the bin.")); Console.Write(MyValidationClass.validateAny("The cat jumped over the bin.")); Console.Write("The dog chased the cat."); Console.Write(MyValidationClass.validateAll("The dog chased the cat.")); Console.Write(MyValidationClass.validateAny("The dog chased the cat.")); } } The results of Listing 12-9 are as follows: The cat jumped over the bin. true true The dog chased the cat. false true In the sentence The dog chased the cat, the character u is not present, so the validation rule that tests for all vowels will fail. The ContainsCharactersValidator class contains three overloaded constructors, as shown in Figure 12-19. The first constructor automatically defaults the containsCharacters parameter to ContainsCharacters.Any. This class also has a corresponding class to support attribute-based validation, called ContainsCharactersValidatorAttribute, which has the exact same constructors as the ContainsCharactersValidator class.

CHAPTER 8 JOHNNXT IS ALIVE!

The range validators work somewhat like the value validators, but instead of testing for one or more values, they test for a range of values. In this case, a developer will specify a high range and a low range, and the validator will determine if a value fits in between the range.

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myIsRunning++; // But don't accelerate past the maximum speed: if(myIsRunning > MAX_SPEED) { myIsRunning = MAX_SPEED; } int horizontal = MOVE_LENGTH * myIsRunning; // if the princess is currently jumping or falling, // we calculate the vertical distance she should move. // This is a parabola given by y = (x*x) * (a + b/c) // where x is how far we have advanced in the jump // or fall (myIsJumping), and a, b, and c are constants // based on the screen size. (The actual values are // read from a properties file and were originally // computed through trial and error.) int vertical = 0; if(myIsJumping != NO_JUMP) { vertical = myIsJumping * myIsJumping * JUMP_INT + (myIsJumping * myIsJumping * JUMP_FRAC_NUM) / JUMP_FRAC_DENOM; // for the first half of the jump we go up, // then for the second half go down: if(myIsJumping < 0) { vdirection = -1; } else { vdirection = 1; } } // set the sprite to the correct frame based // on the princess's current motion: updateSprite(hdirection, vdirection); boolean vcrash = false; boolean hcrash = false; // now calculate the motion one pixel at a time // (vertically then horizontally) to see precisely // how far the princess can move in each of the // requested directions: while((vertical >= 1 && !vcrash) || (horizontal >= 1 && !hcrash)) { myPrincess.move(0, vdirection); if(checkCollision()) { myPrincess.move(0, -vdirection); vcrash = true; } else { vertical -= 1; vcrash = false; myViewWindowY += vdirection; }

CHAPTER 8 JOHNNXT IS ALIVE!

The Validation Application Block comes with four range validators: RangeValidator, DateTimeRangeValidator, Int32RangeValidator, and StringRangeValidator. RangeValidator The RangeValidator class is the base class from which all the other range validators inherit. It contains four overloaded constructors that allow you to specify upper and lower bounds of an object, as well as the behavior of how the range will be validated. It is important to note that any type used by the RangeValidator object must implement the IComparable interface. The behavior of the RangeValidator class is defined via the upperBoundType and lowerBoundType parameters of the constructor. These two parameters are RangeBoundaryType enums, and the values are Inclusive, Exclusive, and Ignore. Figure 12-20 shows the available constructors for the RangeValidator class. Any constructor that does not specify a RangeBoundaryType parameter will default to Inclusive for the respective upper-bound and lower-bound objects.

Figure 12-20. RangeValidator constructors Unlike the other validator classes, the RangeValidator does not have a class that supports attribute-based validation. However, the three classes that inherit from RangeValidator DatetimeRangeValidator, Int32RangeValidator, and StringRangeValidator do have classes that support attribute-based validation. StringRangeValidator, Int32RangeValidator, and DatetimeRangeValidator The StringRangeValidator, Int32RangeValidator, and DatetimeRangeValidator classes have the same constructors as the RangeValidator class, except that parameter T is a string, int, or DateTime object, respectively. The DateTimeRangeValidatorAttribute, Int32RangeValidatorAttribute, and StringRangeValidatorAttribute classes essentially have the same three constructors, with the exception of the DateTimeRangeValidatorAttribute class, which has six constructors (three for handling string representations of date and time, and three for handling DateTime objects directly). The public constructors for these classes are shown in Figures 12-21, 12-22, and 12-23. These three constructors allow you to specify upper-bound and lower-bound values, as well as RangeBoundaryType values.

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