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still at liberty to change the JSP or even the implementation of InternalResourceView without reference to any of the Controllers that use it. The preceding code could be improved by having the Controller look the view up in an ApplicationContext, but it doesn t greatly improve upon the example from a design perspective. The Controller still needs to have too much information about where to find a particular view. A better alternative, shown in Listing 7-7, is to have the Controller specify a key that names the view. Specifying a name for a view is crucial to how a web framework is able to completely decouple the view from the Controller. A Controller can effectively delegate the choice of view to another object which knows how to find and instantiate a view based on an abstract name. Constructing a ModelAndView with a view name rather than a View instance is much the more common approach in Spring MVC applications and in fact, almost all web frameworks offer a mechanism of addressing views by name. Listing 7-7. Returning a Named View public void handleRequestHttpServletRequest request, HttpServletResponse response) throws Exception { Map model = new HashMap(); model.put("flights", getFlightList()); return new ModelAndView("flightList", model); } In the second example, your Controller knows nothing of the view other than its name. That s good! You are now free to vary the type of view that is actually used to render this model, without revisiting even your Controller code.

For example, assume the following native API: namespace NativeLib { class CryptoAlgorithm { public: virtual void Encrypt(/* .. arguments can be ignored so far .. */) = 0; virtual void Decrypt(/* .. arguments can be ignored so far .. */) = 0; }; class SampleCipher : public CryptoAlgorithm {.

By specifying the same x coordinate for the gradient start and end colors, you achieve a vertical color gradient, as illustrated in Figure 11-7. Using the same y coordinate for start and end colors, you will produce a horizontal color gradient. The gradient start and end coordinates are specified as screen coordinates, and they can lie outside of the rectangle. This causes the system to produce a color gradient starting at the start point with the start color and ending at the end point with the end color but showing only the part within your rectangle.

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Caution Be aware that the ModelAndView constructors are slightly counterintuitive, in that you specify

The Bitmap class exposes the DrawEllipse method, which allows you to draw an ellipse. The method accepts a center point and x and y radii: public void DrawEllipse(Color colorOutline, int x, int y, int xRadius, int yRadius);

/* ... implementation can be ignored so far ... */ }; class AnotherCipherAlgorithm : public CryptoAlgorithm { /* ... implementation can be ignored so far ... */ }; } This API allows a programmer to do the following: Instantiate and use SampleCipher Instantiate and use AnotherCipherAlgorithm Derive a class from CryptoAlgorithm, SampleCipher, or AnotherCipherAlgorithm, and override Encrypt or Decrypt Supporting these three features in a managed wrapper is way more complicated than it may seem at first. The support for inheritance of wrapper classes especially adds a lot of complexity. As I will discuss later in the chapter, supporting virtual functions requires extra proxy classes, which is a runtime overhead as well as an implementation overhead. However, chances are good that a wrapper library is only needed to use one or both algorithms. Wrapping this API without supporting inheritance simplifies the task. With this simplification, there is no need to create a wrapper type for the abstract class CryptoAlgorithm. Also, it is not necessary to treat the virtual functions Encrypt and Decrypt specially. To make clear that you don t want to support inheritance, it is sufficient to declare the wrapper classes for SampleCipher and AnotherCipherAlgorithm as sealed classes.

The key to a complete decoupling of the view from the Controller is not to permit the Controller any say in what type of view will be used to render the model. So if the Controller is now divorced from this responsibility, who or what is responsible This job falls to the ViewResolver. ViewResolvers are an important feature in Spring s view layer support. When your Controller selects a concrete view to return as part of the ModelAndView object, it still knows nothing of how that implementation will perform its job. However, it necessarily has knowledge of which view will perform the rendering task. In some scenarios this may be acceptable, but in the general case it would be better for your Controllers not to be burdened with this additional responsibility. This is where a ViewResolver comes into play. Listing 7-8 has the definition for this interface.

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