https://github.com/sandesh300/Rule-Engine-Application

Rule Engine Validation & Error Handling Documentation

Rule String Validation

1. Syntax Validation

The rule engine performs the following syntax validations when processing rule strings:

a. Empty Rules

• Validation: Rules cannot be null or empty strings.
• Method: validateRuleString()
• Error Message: "Rule string cannot be empty"

b. Parentheses Balance

• Requirement: Rules must have properly balanced parentheses.
• Validation Method: Tracks opening and closing parentheses count.
• Error Messages:
  • "Invalid parentheses in rule" (negative balance)
  • "Unmatched parentheses in rule" (non-zero final balance)

c. Logical Operators

• Requirement: Rules must contain at least one logical operator (AND/OR).
• Error Message: "Rule must contain at least one logical operator (AND/OR)"

d. Condition Format

• Validation Method: Uses regex pattern:

  (\\\\\\\\w+)\\\\\\\\s*([<>=])\\\\\\\\s*('[^']*'|\\\\\\\\d+(\\\\\\\\.\\\\\\\\d+)?)