CSV Parser: Custom Java CSVReader

This project is a robust CSV parser. It reads and processes CSV (Comma-Separated Values) files with special attention to formatting edge cases like:

• Quoted fields with embedded commas
• Escaped quotes inside fields
• Inconsistent line endings (\n, \r\n)
• Empty fields and empty rows
• Ill-formed CSV data (triggers custom CSVFormatException)

Features

• Implements CSVReader that reads rows using a custom CharacterReader
• Parses fields according to standard CSV rules (RFC 4180-style)
• Throws a custom CSVFormatException when CSV rules are violated
• Includes comprehensive JUnit test coverage (CSVReaderTest.java)

Files Included

• CSVReader.java – main parser class
• CharacterReader.java – reads characters with position tracking
• CSVFormatException.java – custom error for invalid CSV formats
• CSVReaderTest.java – JUnit tests that handle normal and edge cases

How to Run Tests

Make sure you're in the root directory of your project and run:

# Using Maven:
mvn test

# Or in Eclipse:
Right-click → Run As → JUnit Test