Package com.ntu.fdae.group1.bto.repository.util

Class CsvRepositoryHelper<ID,T>

java.lang.Object

com.ntu.fdae.group1.bto.repository.util.CsvRepositoryHelper<ID,T>

Type Parameters:

ID - The type of identifier used for entities

T - The entity type this helper manages

public class CsvRepositoryHelper<ID,T>
extends Object

Helper class that provides common CSV file operations for repositories.

This class encapsulates the logic for reading from and writing to CSV files, providing a reusable component for repository implementations. It handles serialization and deserialization between entity objects and CSV format.

Constructor Summary

Constructors

Constructor	Description
CsvRepositoryHelper(String filePath, String[] csvHeader, Function<List<String[]>,Map<ID,T>> deserializer, Function<Map<ID,T>,List<String[]>> serializer)	Constructs a new CsvRepositoryHelper with the specified parameters.

Method Summary

Modifier and Type	Method	Description
Map<ID,T>	loadData()	Loads data from the CSV file and converts it to a map of entities.
void	saveData(Map<ID,T> entities)	Saves a map of entities to the CSV file.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CsvRepositoryHelper

public CsvRepositoryHelper(String filePath,
 String[] csvHeader,
 Function<List<String[]>,Map<ID,T>> deserializer,
 Function<Map<ID,T>,List<String[]>> serializer)

Constructs a new CsvRepositoryHelper with the specified parameters.

Parameters:

filePath - The path to the CSV file

csvHeader - The header row for the CSV file

deserializer - Function that takes List<String[]> read from CSV and returns Map<ID, T>

serializer - Function that takes the current Map<ID, T> and returns List<String[]> to be written

Method Details

loadData

public Map<ID,T> loadData()
                   throws DataAccessException

Loads data from the CSV file and converts it to a map of entities.

This method reads the CSV file at the configured path, skips the header row, and uses the provided deserializer function to convert the CSV data into entity objects.

Returns:

A map of entities, keyed by their identifiers

Throws:

DataAccessException - If an error occurs while reading or parsing the CSV file

saveData

public void saveData(Map<ID,T> entities)
              throws DataAccessException

Saves a map of entities to the CSV file.

This method uses the provided serializer function to convert entity objects into CSV data, then writes that data to the configured file path with the specified header.

Parameters:

entities - The map of entities to save

Throws:

DataAccessException - If an error occurs while writing to the CSV file