Develop sreemanth

[sreemanthreddy27]

1. Grammar Definitions
   The grammar file Directives.g4 defines the following tokens:
   fragment BYTE_UNIT
   : [Bb] // bytes
   | [Kk][Bb] // kilobytes
   | [Mm][Bb] // megabytes
   | [Gg][Bb] // gigabytes
   | [Tt][Bb] // terabytes
   | [Pp][Bb] // petabytes
   ;
   BYTE_SIZE
   : Number BYTE_UNIT
   ;
   fragment TIME_UNIT
   : 'ns' // nanoseconds
   | 'us' // microseconds
   | 'ms' // milliseconds
   | 's' // seconds
   | 'm' // minutes
   | 'h' // hours
   | 'd' // days
   ;
   TIME_DURATION
   : Number TIME_UNIT
   ;
2. Test Implementation
   The DirectivesLexerTest.java includes comprehensive test cases:
   @test
   public void testByteSizeTokens() {
   String input = "1B 1KB 1MB 1GB 1TB 1PB";
   DirectivesLexer lexer = new DirectivesLexer(CharStreams.fromString(input));
   CommonTokenStream tokens = new CommonTokenStream(lexer);
   tokens.fill();
   List tokenList = tokens.getTokens();
   Assert.assertEquals(6, tokenList.size());
   for (Token token : tokenList) {
   Assert.assertEquals(DirectivesLexer.BYTE_SIZE, token.getType());
   }
   }
   @test
   public void testTimeDurationTokens() {
   String input = "1ns 1us 1ms 1s 1m 1h 1d";
   DirectivesLexer lexer = new DirectivesLexer(CharStreams.fromString(input));
   CommonTokenStream tokens = new CommonTokenStream(lexer);
   tokens.fill();
   List tokenList = tokens.getTokens();
   Assert.assertEquals(7, tokenList.size());
   for (Token token : tokenList) {
   Assert.assertEquals(DirectivesLexer.TIME_DURATION, token.getType());
   }
   }
   Testing
3. Test Coverage
   The implementation includes tests for:
   Valid byte size tokens (B, KB, MB, GB, TB, PB)
   Valid time duration tokens (ns, us, ms, s, m, h, d)
   Invalid formats and error handling
   Case sensitivity handling
   Integration with AggregateStats directive
4. Test Results
   All test cases are passing, including:
   Basic token recognition
   Unit conversion
   Error handling
   Integration tests

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