Leaf Input Parsing complete

Core/Services/LeafInputCsvParser.cs

@@ -0,0 +1,155 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using CsvHelper;
+using CsvHelper.Configuration;
+using LeafWeb.Core.Models;
+
+namespace LeafWeb.Core.Services
+{
+	public class LeafInputCsvParser : IDisposable
+	{
+		private readonly FileSystemInfo _csvFile;
+		private readonly StreamReader _reader;
+		private readonly CsvReader _csv;
+		
+		public LeafInputCsvParser(FileSystemInfo csvFile)
+		{
+			_csvFile = csvFile;
+			if (!csvFile.Exists)
+				throw new FileNotFoundException("Cannot find file '" + csvFile.Name + "'");
+
+			_reader = File.OpenText(csvFile.FullName);
+			var csvConfiguration = new CsvConfiguration {HasHeaderRecord = false};
+			_csv = new CsvReader(_reader, csvConfiguration);
+		}
+
+		public LeafInput Parse()
+		{
+			// First 10 lines
+			var leafInput = ParseLeafInput();
+			leafInput.FileName = _csvFile.Name;
+
+			// Next 3 (Header, Units, and Values)
+			leafInput.Site = ParseLeafInputSite();
+
+			// Next 3 (Header, Units, and Values)
+			leafInput.Photosynthetic = ParseLeafInputPhotosynthetic();
+
+			// Remaining lines (Header, Units, and Data)
+			leafInput.Data = ParseLeafInputData();
+			
+			return leafInput;
+		}
+
+		private LeafInput ParseLeafInput()
+		{
+			var items = new List<string>();
+			for (var i = 0; i < 10; i++)
+			{
+				if (!_csv.Read())
+					throw new ParseException("Could not read line number " + _csv.Row);
+
+				string field;
+				if (!_csv.TryGetField(0, out field))
+					throw new ParseException("Could not read first field on line number " + _csv.Row);
+				items.Add(field);
+			}
+			return ParsedObjectFactory<LeafInput>.Create(items.ToArray());
+		}
+
+		private string[] GetNextCsvRowValues()
+		{
+			// get values from row
+			if (!_csv.Read())
+				return null;
+
+			// put all the values from this row into an array
+			var values = new List<string>();
+			var index = 0;
+			string value;
+			while (_csv.TryGetField(index, out value))
+			{
+				values.Add(value);
+				index++;
+			}
+			return values.ToArray();
+		}
+
+		private LeafInputSite ParseLeafInputSite()
+		{
+			var titles = GetNextCsvRowValues();
+			if (titles == null)
+				throw new ParseException("Could not read site header row on line number " + _csv.Row);
+			var units = GetNextCsvRowValues();
+			if (units == null)
+				throw new ParseException("Could not read site units row on line number " + _csv.Row);
+			var values = GetNextCsvRowValues();
+			if (values == null)
+				throw new ParseException("Could not read site value row on line number " + _csv.Row);
+		
+			var items = new List<Tuple<string, string>>();
+			for (var i = 0; i < titles.Length && i < values.Length; i++)
+			{
+				var item = Tuple.Create(titles[i], values[i]);
+				items.Add(item);
+			}
+			return ParsedObjectFactory<LeafInputSite>.Create(items.ToArray());
+		}
+
+		private LeafInputPhotosynthetic ParseLeafInputPhotosynthetic()
+		{
+			var titles = GetNextCsvRowValues();
+			if (titles == null)
+				throw new ParseException("Could not read photosynthetic header row on line number " + _csv.Row);
+			var units = GetNextCsvRowValues();
+			if (units == null)
+				throw new ParseException("Could not read photosynthetic units row on line number " + _csv.Row);
+			var values = GetNextCsvRowValues();
+			if (values == null)
+				throw new ParseException("Could not read photosynthetic value row on line number " + _csv.Row);
+		
+			var items = new List<Tuple<string, string>>();
+			for (var i = 0; i < titles.Length && i < values.Length; i++)
+			{
+				var item = Tuple.Create(titles[i], values[i]);
+				items.Add(item);
+			}
+			return ParsedObjectFactory<LeafInputPhotosynthetic>.Create(items.ToArray());
+		}
+
+		private LeafInputData[] ParseLeafInputData()
+		{
+			var titles = GetNextCsvRowValues();
+			if (titles == null)
+				throw new ParseException("Could not read data header row on line number " + _csv.Row);
+			var units = GetNextCsvRowValues();
+			if (units == null)
+				throw new ParseException("Could not read data units row on line number " + _csv.Row);
+
+			var valueArrays = new List<string[]>();
+			while (true)
+			{
+				var values = GetNextCsvRowValues();
+				if (values == null)
+					break;
+				valueArrays.Add(values);
+			}
+			return ParsedObjectFactory<LeafInputData>.Create(titles, valueArrays.ToArray());
+		}
+
+		public void Dispose()
+		{
+			_reader.Dispose();
+		}
+
+		public static void ExportCsv(string filename, IEnumerable<LeafInput> leafInputs)
+		{
+			using (var textWriter = new StreamWriter(filename))
+			{
+				var csv = new CsvWriter(textWriter);
+				csv.WriteRecords(leafInputs);
+			}
+		}
+	}
+}