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