ex6_19.txt

j2ee core design patterns

Example 6.19 ApplicationControllerImpl
public class ApplicationControllerImpl implements 
    ApplicationController {

  public void initialize() {
    commandMapper = CommandMapper.getInstance();
  }

  public ResponseContext handleRequest(RequestContext requestContext) {
    ResponseContext responseContext = null;
    try {
      // validate request parameters
      requestContext.validate();

      // Translate command name into Command abstraction
      String commandName = requestContext.getCommandName();
      Command command = commandMapper.getCommand(commandName);

      // Invoke Command
      responseContext = command.execute(requestContext);

      // Identify View Name
      CommandMap  mapEntry = commandMapper.getCommandMap(commandName);
      String viewName = mapEntry.getViewName();
      responseContext.setLogicalViewName(viewName);
    } catch (ValidatorException e1) {
      // Handle Exception
    }
    return responseContext;
  }
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