FIGURE 3.27 in Software Encoder QR-Code in Software FIGURE 3.27

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FIGURE 3.27 using software toassign qr code with web,windows application QR Codes The service() method r QR Code 2d barcode for None etrieves information from the Web or the local network based on the URL passed to the method in the Hashtable of parameters. The service() method uses the IOMaster.readFromTextFile() utility to connect to the end point of the URL and get the information from the network.

We consider the IOMaster.readFromTextFile() utility as well as related methods in Appendix 3. After reading the news, the service() method returns this information as a String object value inside the Hashtable with the key equal to news.

The problem is how to pass this information to the NewsLineComponent. There are several implementation alternatives. Let us consider each alternative along with brief for and against comments.

1. Pass the direct reference to the NewsLineComponent to the ControlComponent. Yes! This is the simplest solution.

No. It couples the ControlComponent to the NewsLineComponent too tightly. We want to avoid such coupling.

The ControlComponent can potentially be used with other components that may be similar but not exactly the same, such as the NewsLineComponent.. User Requirements, Version 3 /** * the constructor Software qr barcode reads the config file and creates a GUI (based on * the config file) * @param serviceController reference to dispatch service * provided by a container * @param urlToConfigFile */ public ControlComponent(ServiceController serviceController, String urlToConfigFile) { this.serviceController = serviceController; String controlConfig = IOMaster.readTextFile (serviceController, urlToConfigFile); if(controlConfig == null .

controlConfig. starts With("ERROR")) { return; } controlConfig = Stringer.replace("\r\n","\n", controlConfig); // to Unix ending the latest // java.

lang.String includes split method String[] lines = Stringer.split("\n", controlConfig); if(lines ! = null) { // create array of buttons buttons = new Button[lines.

length]; } for(int i =0; lines ! = null && i < lines.length; i++) { String[] splits = Stringer.split(",", lines[i]); // split values: name and url if(splits == null .

splits.length < 2) QR Code 2d barcode for None { continue; // not sufficient line } // put into the namesAndURLs Hashtable a name // as a key and a URL as an object namesAndURLs.put(splits[0], splits[1]); // create a new button with the label as the first letter // of the name String firstLetter = splits[0].

substring(0,1); namesAndLetters.put(firstLetter, splits[0]); // associate firstLetter with the full name buttons[i] = new Button(firstLetter); // example: "w" - for weather add(buttons[i]); // put into the namesAndButtons Hashtable a name as // a key and a button as an object namesAndButtons.put(splits[0], buttons[i]); // the ControlComponent itself will listen to button events buttons[i].

addActionListener(this); } }. FIGURE 3.28 FROM A SPECIFIC TASK TO INTEGRATION-READY COMPONENTS /** * actionPerformed( ) method is to handle action events * In this case the method is called when a user presses any of control * buttons * @param actionEvent to be used to figure out which button was pressed */ public void actionPerformed(ActionEvent actionEvent) { String command = actionEvent. getActionCommand(); // first letter String name = (String)namesAndLetters. get(command); String url = namesAndURLs.

get(name); Hashtable parameters = new Hashtable(); parameters.put(name, url); parameters = service(parameters); // change information channel serviceController.dispatch(parameters); // dispatch information to the news line ! // change control button appearance to highlight a selected button if(buttonPressed ! = null) buttonPressed.

setForeground (defaultForeground); buttonPressed.setBackground (defaultBackground); } buttonPressed = (Button)namesAndButtons. get(name); buttonPressed.

setForeground (selectedForeground); buttonPressed.setBackground (selectedBackground); } } // end of the ControlComponent class. FIGURE 3.29 2. Pass the reference to the WebNewsContainer to the ControlComponent. The WebNewsContainer can use the already-existing reference to the NewsLine Component.

. Yes! This will enable QR Code 2d barcode for None the WebNewsContainer to direct not only the NewsLineComponent but other components that this container can control. No. Such a solution, even though it is better than the previous one, still restricts the ControlComponent to work with a very speci c container, the WebNewsContainer.

. 3. Delegate the dispat cher role to a new object that will have a reference to the WebNewsContainer. Yes! This solution will decouple the ControlComponent from the WebNews Container.

No. The solution will increase complexity by introducing another class. Unfortunately, the new class will be tightly coupled with the WebNewsContainer.

4. The most commonly used solution (which we will consider rst) is close to the second one but is more elegant and generic. In this solution, we still connect a component to its container, but with a very light connection.

Later on, we will discuss an even better alternative, but everything at its own time. Here are several steps to implement solution 4: 4.1.

De ne an interface with a generic method that can be used for multiple purposes. The ServiceController interface with the dispatch() method is presented in Fig. 3.

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