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FileHandlers.cs
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FileHandlers.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading.Tasks;
using System.Xml.Serialization;
using FileHelpers;
using AutoMapper;
namespace FileTransform
{
// FileHandlers are designed to encapsulate all the functionality needed to transform a file.
public interface IFileHandler
{
/// <summary>
/// Reads in and parses information from a file appropriate to this data format.
/// </summary>
/// <param name="fileName"></param>
void ReadFile(string fileName);
/// <summary>
/// Serializes data from the internal data store to this specific data format.
/// </summary>
/// <param name="fileName"></param>
void WriteFile(string fileName);
/// <summary>
/// Determines precisely how this FileHandler maps its information to other FileHandlers
/// Note that this store must know how to interface with other file handler stores.
/// If a new file handler type were to be introduced, it is assumed that this method would be updated as to include mapping to new file handlers.
/// </summary>
/// <param name="filehandler"></param>
void MapStoreOnto(IFileHandler filehandler);
/// <summary>
/// Indicates the type of file this file handler uses.
/// </summary>
string FileType { get; }
}
public class XMLFileHandler : IFileHandler
{
public XMLSchool Store { get; set; }
private XmlSerializer _serializer;
private XmlSerializerNamespaces _ns;
public XMLFileHandler()
{
Store = new XMLSchool();
// Please refer to the XMLDataStuctures class file to see how the xml tree is constructed.
// Once an object representing the tree is properly constructed, .NET XMLSerializers map the information from the xml to the object accordingly.
_serializer = new XmlSerializer(typeof(XMLSchool));
_ns = new XmlSerializerNamespaces();
_ns.Add(string.Empty, string.Empty);
}
public void ReadFile(string fileName)
{
using (var reader = new StreamReader(fileName))
{
Store = (XMLSchool)_serializer.Deserialize(reader);
}
}
public void WriteFile(string fileName)
{
using (var writer = new StreamWriter(fileName))
{
_serializer.Serialize(writer, Store, _ns);
}
}
public void MapStoreOnto(IFileHandler filehandler)
{
// The mapping used here is created from AddMappings() in the FileHandlerFactory
if (filehandler.GetType() == typeof(CSVFileHandler))
Mapper.Map(Store, ((CSVFileHandler)filehandler).Store);
}
public string FileType { get { return @"XML"; } }
}
public class CSVFileHandler : IFileHandler
{
public CSVSchool Store { get; set; }
private bool _hasHeader;
// I'm using the FileHelpers library to read and write CSV files.
// The file format is described in the CSVDataStuctures class file.
private FileHelperEngine<CSVRow> _serializer = new FileHelperEngine<CSVRow>();
public CSVFileHandler(bool hasHeader = true)
{
Store = new CSVSchool();
_hasHeader = hasHeader;
_serializer.HeaderText = @"classroom id, classroom_name, teacher_1_id, teacher_1_last_name, teacher_1_first_name, teacher_2_id, teacher_2_last_name, teacher_2_first_name, student_id, student_last_name, student_first_name, student_grade";
}
public void ReadFile(string fileName)
{
var entries = _serializer.ReadFile(fileName);
if (_hasHeader) entries = entries.ToList().Skip(1).ToArray();
Store.Rows = entries.ToArray();
}
public void WriteFile(string fileName)
{
_serializer.WriteFile(fileName, Store.Rows);
}
public void MapStoreOnto(IFileHandler filehandler)
{
// The mapping used here is created from AddMappings() in the FileHandlerFactory
if (filehandler.GetType() == typeof(XMLFileHandler))
Mapper.Map(Store, ((XMLFileHandler)filehandler).Store);
}
public string FileType { get { return @"CSV"; } }
}
}