Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question

Parser.java is incomplete. Where is the logic for each method as mentioned in the comments. I need the logic for each method. Attached is image of what I exactly mean. 

HEHEHNISEM IN MA 4 7 5 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 // Method to parse variable reference for the $ operator public Operatione ParselValueDollar () // You need to implement this logic to create an OperationNode for the $ operator. // Get the value of the $ operator appropriately. return null; // Replace with actual implementation. } // Method to parse constants and patterns public Constant OrNode PatternNode ParseBottomLevel ConstantsAndPatterns () } // You need to implement this logic to detect strings, numbers, and patterns // and create appropriate nodes. return null; // Replace with actual implementation. // Method to parse parentheses public OperationNode ParseBottomLevelParenthesis() throws ParseException { if (tokenHandler.MatchAndRemove (Token. TokenType. LPAREN) != null) { // You need to implement the logic to get the contents of the parenthesis. // Create an OperationNode for the contents. // Handle the closing parenthesis as well. // Example: (expr) return null; // Replace with actual implementation. } else { throw new ParseException("Expected '('", tokenHandler.getCurrentToken().getStart()); } } // Existing code... // Method to parse unary operators // You mentioned that all four unary operators are correct, so ensure they are correctly parsed.
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Transcribed Image Text:HEHEHNISEM IN MA 4 7 5 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 // Method to parse variable reference for the $ operator public Operatione ParselValueDollar () // You need to implement this logic to create an OperationNode for the $ operator. // Get the value of the $ operator appropriately. return null; // Replace with actual implementation. } // Method to parse constants and patterns public Constant OrNode PatternNode ParseBottomLevel ConstantsAndPatterns () } // You need to implement this logic to detect strings, numbers, and patterns // and create appropriate nodes. return null; // Replace with actual implementation. // Method to parse parentheses public OperationNode ParseBottomLevelParenthesis() throws ParseException { if (tokenHandler.MatchAndRemove (Token. TokenType. LPAREN) != null) { // You need to implement the logic to get the contents of the parenthesis. // Create an OperationNode for the contents. // Handle the closing parenthesis as well. // Example: (expr) return null; // Replace with actual implementation. } else { throw new ParseException("Expected '('", tokenHandler.getCurrentToken().getStart()); } } // Existing code... // Method to parse unary operators // You mentioned that all four unary operators are correct, so ensure they are correctly parsed.
Expert Solution
Check Mark
Step 1: Java Program:

Answer:

Here I provide code for all the classes you need.

Operation.java

public enum Operation {
    ADD,
    SUBTRACT,
    MULTIPLY,
    DIVIDE,
    VARIABLE,
    CONSTANT
}

This is the code for the given class. 


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