Adding saving of spreadsheets as CSV.

Axel/src/de/hs_mannheim/informatik/spreadsheet/Axel.java

@@ -1,5 +1,6 @@
 package de.hs_mannheim.informatik.spreadsheet;
 
+import java.io.FileNotFoundException;
 
 /**
  * Part of a simplified spreadsheet system for the PR1 programming lab at Hochschule Mannheim.
@@ -8,7 +9,7 @@ package de.hs_mannheim.informatik.spreadsheet;
  */
 public class Axel {
 
-	public static void main(String[] args) {
+	public static void main(String[] args) throws FileNotFoundException {
 		Spreadsheet spr = new Spreadsheet(10,10);
 		
 		spr.put("A3", "123");
@@ -20,7 +21,9 @@ public class Axel {
 		
 		System.out.println(spr);
 		
-		// TODO: You might want to put "UI loop" for entering value and formulas here.
+		spr.saveCsv("/tmp/test.csv");
+		
+		// TODO: You might want to put "UI loop" for entering value and formulas here resp. in some UI methods.
 	}
 
 }

Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java

@@ -2,6 +2,7 @@ package de.hs_mannheim.informatik.spreadsheet;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.io.PrintWriter;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -79,6 +80,31 @@ public class Spreadsheet {
 		// TODO: implement this
 	}
 
+	/**
+	 * A method for saving data to a CSV file.
+	 * @param path The file to write.
+	 * @return Nothing.
+	 * @exception IOException If path does not exist.
+	 */
+	public void saveCsv(String path) throws FileNotFoundException {
+		PrintWriter out = new PrintWriter(path);
+
+		for (Cell[] row : cells) {
+			for (Cell cell : row) {
+				if (!cell.getFormula().isEmpty())
+					out.print("=" + cell.getFormula());
+				else
+					out.print(cell.getValue());
+
+				if (cell != row[cells.length-1])
+					out.print(",");
+			}
+			out.println();
+		}
+
+		out.close();
+	}
+
 	/**
 	 * This method does the actual evaluation/calcluation of a specific cell
 	 * @param cellName the name of the cell to be evaluated
@@ -131,7 +157,7 @@ public class Spreadsheet {
 		Matcher m = Pattern.compile("([A-Z][0-9]*)|[-\\+\\*/]|[0-9]*").matcher(formula);
 
 		long res = 0;
-		
+
 		// TODO implement
 
 		// uncomment the following to see an example how the elements of a formula can be accessed