- Pay attention to exception handling (otherwise: -0.5 points)
- Create your own types of exceptions to report abnormal events related to
application execution.
- Organize your classes and interfaces in packages.
Media Catalog
Write an application that can manage a catalog of multimedia items. An entry in this catalog might be a song, a movie, a book, an image or any item that has at least a name and a path in the local file system. (We may also consider specifying a release year, a rating and other additional data, for example the author of the book, etc.)
The main specifications of the application are: Compulsory (1p)
- Create an object-oriented model of the problem. You should have at least the following classes: Catalog and two item classes at your choice. Consider using an interface or an abstract class in order to describe the items in a catalog.
- Implement the following methods representing commands that will manage the content of the catalog:
o add: adds a new entry into the catalog;
o list: prints the content of the catalog on the screen;
o play: playback using the native operating system application (see
the Desktop class);
o save: saves the catalog to an external file (either as a text or binary,
using object serialization);
o load: loads the catalog from an external file.
• The application will signal invalid data (year, path, etc.) using a custom exception.
Optional (2p)
- Create a shell that allows reading commands from the keyboard, together with their arguments.
- Represent the commands using classes instead of methods. Use an interface or an abstract class in order to desribe a generic command.
Implement the commands add, list, save, load, play (create the
classes AddCommand, ListCommand, etc.). - Implement the command report: create (and open) an HTML report representing the content of the catalog.
Use a template engine such as FreeMarker or Velocity, in order to create the HTML report. - The application will signal the commands that are not valid using a custom exception.
- The final form of the application will be an executable JAR archive. Identify the generated archive and launch the application from the console, using the JAR.
Bonus (2p)
- Use Apache Tika in order to extract metadata from your catalog items and implement the command info in order to display them.
- Create a graph G in which the catalog items represent the nodes, two nodes being connected if they share some common feature (for example, two songs that have the same artist, etc).
- Suppose that you want to play all the items in the catalog in as fe w days as possible, so that in one day you will not play two items that are connected in G. Create an algorithm that generates the playlists for each day.
- Create large graphs and test your algorithm. Resources
- Basic I/O
- Exceptions
- Regular Expressions
- Setting the class path
- Creating, Importing, and Configuring Java Projects in Netbeans
- Packaging Programs in JAR Files
Objectives
- Use basic I/O streams.
- Understand the difference between byte and character streams, primitive and
decorator streams.
- Use File I/O to works with files and directories.
- Handle exceptions using try-catch-finally blocks.
- Handle resources using try-with-resources statements.
- Create custom exceptions and chained exceptions.
- Use regular expressions and glob patterns
- Understand the notion of CLASSPATH.
- Use external JAR libraries.
- Package all project classes as an executable JAR file.
