The purpose of this project is to develop an editor that allows preparing text documents and transforming them to audio using external text to speech libraries. ( In the files there is a demoVideo that includes all the functionalities of the app)
DemoVideo.8.mp4
Using this architecture we seperate the application in three parts. Models, Views, Controllers
classes that are responsible for the representation and the management of the documents.
classes that are responsible for the visualization of the documents and the interaction with the user.
classes that control the data flow between the model and the view elements. In other words, these classes realize the reactions of the application to the user input.
Managers are responsible for the various business logic units such as Document related actions with Document Manager, or for Replay Command related actions with Replay Manager.
the different commands that are supported by the Text2SpeechEditor are classes that implement the Java Swing ActionListener interface. In particular, we assume commands that correspond to the different user stories that should be supported by the editor (NewCommand, EditCommand, SaveCommand, DocumentToSpeech, etc.). These classes implement the commands using information that is provided by the GUI classes of the view package and the application logic classes of the model package. In particular, the command classes use the current document object that is manipulated by the user, which belongs to the Document class. The command objects are added as action listeners to the application control widgets (buttons, menu items, ...). Based in the Command pattern, we can easily configure the Text2SpeechEditor with an extensible set of commands. To support new commands we just have to develop new classes that implement the general ActionListener interface. Moreover, the pattern allows storing in a list of commands (held by an object of the ReplayManager class) that have been performed by the user to facilitate replaying the sequence multiple times (ReplayCommand).
is responsible for the creation of objects that implement the ActionListener interface. Based on this pattern, we can easily extend the application logic with new classes that implement the ActionListener interface, without having to change the existing logic too much see OCP principle - open for extension closed to modification). In particular, to deal with the creation of the objects of a new class we just have to modify the code of the factory method and nothing else.
is responsible for the creation of objects that implement the EncodingStrategy interface. Based on this pattern, we can easily extend the application logic with new classes that implement the EncodingStrategy interface, without having to change the existing logic too much see OCP principle - open for extension closed to modification). In particular, to deal with the creation of the objects of a new class we just have to modify the code of the factory method and nothing else.
is responsible for the creation of objects that implement the TextToSpeechAPI interface. Based on this pattern, we can easily extend the application logic with new classes that implement the TextToSpeechAPI interface, without having to change the existing logic too much see OCP principle - open for extension closed to modification). In particular, to deal with the creation of the objects of a new class we just have to modify the code of the factory method and nothing else.
Using the above patterns we have achieved the clear definition for high level functions in a required functionality, eg Encode. Thus, implementing a generic interface, this is a commitment to the other methods that will implement that a certain number of functions or certain actions should implemented. Then, the respective implementations of the main interface may contain abstract methods. The classes with abstract methods can be extended by other classes that will make the definition even clearer for the various versions and implementations of an even more specific implementation
we define a general TextToSpeechAPI interface. Document manager class has as attributes references to the TextToSpeechAPI which are initialized to objects that implement the interface, via parameters of the classes' constructors. The TextToSpeechAPI interface has at least 2 implementation. The FreeTTSAdapter implementation realizes the interface using the Free TTS API2. On the other hand, the FakeTextToSpeechAPI is a fake adaptor that we can use to test our application in isolation from the actual text to speech API that is used. Instead of transforming text to speech the fake adaptor just provides methods that we shall use to write assertions for our tests in the JUnit framework