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As usual in software development, it is useful to precisely define the developer s task before starting to write code I am aware that the sentence you just read might sound as if I copied it from a second-rate book about software design from the early 90s, but for wrapping native libraries, defining the tasks carefully is of special importance If you have to wrap a native library, the task seems obvious there is an already existing native library, and a managed API has to be implemented to bring the features of the native library to the managed world For most wrapping projects, this generic task description is insufficient by far Without a more precise view of the task, you will likely write one managed wrapper class for each native type of a C++ library.

and filling with rectangles at the same time. If you indicate a corner radius greater than zero, your rectangle will be drawn as a frame.

Obviously your applications aren t going to create views programmatically too often. Much more commonly, you will define the view instances in a configuration file and have Spring create them for you. There are several different ways to do this, and before we dive in and take a look at them, we need to look more closely at the relationship between Controller and View, and to introduce the ViewResolver.

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In the preceding examples, all filled rectangles were drawn entirely filled with one color. By specifying different values for the start and end colors, you can achieve interesting color gradient effects. The code in Listing 11-5 produces a rectangle filled with a diagonal color gradient that starts in the top-left corner of the rectangle with white and ends in the bottom-right corner with black, as shown in Figure 11-6.

If the native library consists of more than one central abstraction, wrapping one-to-one is often a bad idea, because this often results in complications that don t benefit your concrete problem, as well as a significant amount of unused code To find a better task description, you should take a step back and do some thinking to understand the concrete problem To find a description that is more specific than the preceding one, you should especially ask yourself two questions: What subset of the native API is really needed by managed code What are the use cases for which the native API is needed by managed clients Once you know the answers to these questions, you are often able to simplify your task by cutting any features that are not needed and by defining new abstractions that wrap based on use cases.

Spring Controllers specify the following method in their interface shown in Listing 7-5. Listing 7-5. Controller Interface Method ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception; The important detail here is the return value from the handleRequest() method. A ModelAndView object is a simple holder enabling your Controller to return two distinct types of object to the caller. The model in question is usually a Map containing keyed object values of the prepared data set that the view will render. The view might either be an implementation itself (of the View interface) or a String holding a name that will later be resolved to an actual View by a ViewResolver, which we ll learn more about in the next section. Let s look at a sample Controller implementation that takes the first option (Listing 7-6). Listing 7-6. Returning a View Instance public void handleRequestHttpServletRequest request, HttpServletResponse response) throws Exception { Map model = new HashMap(); model.put("flights", getFlightList()); View view = new InternalResourceView("/WEB-INF/jsp/flightList.jsp"); return new ModelAndView(view, model); } In Listing 7-6, the Controller is responsible for determining the actual view implementation and returns this object along with the model it has generated. Note that this code still makes no assumptions about how that particular view will render the content, and you are

Figure 11-6. Diagonal color gradient Listing 11-5. Drawing a Diagonal Color Gradient bmp.DrawRectangle(Color.White, 1, 100, 100, 200, 100, 0, 0, Color.White, 100, 100, Color.Black, 100 + 200, 100 + 100, Bitmap.OpacityOpaque); // // // // // // // // // // outline color outline thickness x and y of top left corner width and height x and y corner radius gradient start color gradient start coordinates gradient end color gradient end coordinates opacity

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