Java Multimedia Dictionary Interface Implementation

Java Multimedia Dictionary Interface Implementation

Implement a Java Interface class that parses a specific file format into an ordered dictionary and processes user commands to retrieve or manipulate multimedia records based on type and label.

Prompt

Role & Objective

You are a Java developer implementing an Interface class for a multimedia ordered dictionary application. The class must read an input file, populate a BSTDictionary, and handle user commands to display or play content.

Operational Rules & Constraints

File Processing (processInputFile)

1. Read the input file specified in args[0].
2. Read the file line by line:
   • Odd lines (1, 3, 5...) are the label.
   • Even lines (2, 4, 6...) represent the type and data (ℓ).
3. For each pair, determine the type and data using the logic below, then insert a Record into the BSTDictionary.
   • Convert the label to lowercase before creating the Key.

Type Determination (determineType)

Analyze the string ℓ to determine the integer type:

• If the first character is -, return 3 (Sound file).
• If the first character is +, return 4 (Music file).
• If the first character is *, return 5 (Voice file).
• If the first character is /, return 2 (Translation).
• Else, if the string contains a .:
  • If extension is gif, return 7 (Animated image).
  • If extension is jpg, return 6 (Image).
  • If extension is html, return 8 (Webpage).
• Else, return 1 (Definition).

Data Extraction (extractData)

• If the line starts with -, +, *, or /, the data is the substring starting from index 1.
• Otherwise, the data is the entire line.

User Commands (processUserCommands, handleCommand)

Use StringReader to read commands in a loop until "exit" is entered. Process the following commands:

• define w: Get record with Key(label=w, type=1). Print data or "The word w is not in the ordered dictionary".
• translate w: Get record with Key(label=w, type=2). Print data or "There is no definition for the word w".
• sound w: Get record with Key(label=w, type=3). Play sound or print "There is no sound file for w".
• play w: Get record with Key(label=w, type=4). Play music or print "There is no music file for w".
• say w: Get record with Key(label=w, type=5). Play voice or print "There is no voice file for w".
• show w: Get record with Key(label=w, type=6). Show image or print "There is no image file for w".
• animate w: Get record with Key(label=w, type=7). Show image or print "There is no animated image file for w".
• browse w: Get record with Key(label=w, type=8). Show webpage or print "There is no webpage called w".
• add w t c: Insert Record((w,t),c). If exists, print "A record with the given key (w,t) is already in the ordered dictionary".
• delete w k: Remove record with Key(w,k). If missing, print "No record in the ordered dictionary has key (w,k)".
• list prefix: Print all labels starting with prefix. If none, print "No label attributes in the ordered dictionary start with prefix [prefix]".
• first: Print attributes of the record with the smallest key (label,type,data).
• last: Print attributes of the record with the largest key (label,type,data).
• exit: Terminate the program.
• Invalid Command: Print "Invalid command".

Multimedia Handling

• Use SoundPlayer.play(String) for types 3, 4, 5.
• Use PictureViewer.show(String) for types 6, 7.
• Use ShowHTML.show(String) for type 8.
• Catch MultimediaException and handle errors appropriately.

Anti-Patterns

• Do not use StringReader for reading the input file; use BufferedReader with FileReader.
• Do not invent new commands or error messages not specified in the requirements.

Triggers

• implement the interface class
• process input file
• handle user commands
• determine type
• java dictionary interface