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PR1-Spreadsheet
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readCSV() Methode ergänzt

Anastasia Kisner 2024-01-09 13:38:45 +01:00
parent c980006f02
commit d7dbffeff8
1 changed files with 48 additions and 13 deletions
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61
Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
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@ -1,12 +1,17 @@
package de.hs_mannheim.informatik.spreadsheet;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A simplified spreadsheet class for the PR1 programming lab at Hochschule Mannheim.
* One aspect worth mentioning is that it only supports long numbers, not doubles.
@ -21,15 +26,17 @@ public class Spreadsheet {
* @param rows number of rows
* @param cols number of columns
*/
public Spreadsheet(int rows, int cols) {
public Spreadsheet(int rows, int cols) throws IllegalArgumentException {
// TODO limit the maximum size on 99 (1..99) rows and 26 (A..Z) columns
if(rows < 1 || rows > 99 || cols < 1 || cols > 26){
throw new IllegalArgumentException("Range in rows 1-99; Range in cols 1-26");
}else {
cells = new Cell[rows][cols];
cells = new Cell[rows][cols];
for (int r = 0; r < rows; r++)
for (int c = 0; c < cols; c++)
cells[r][c] = new Cell();
for (int r = 0; r < rows; r++)
for (int c = 0; c < cols; c++)
cells[r][c] = new Cell();
}
}
// -----
@ -75,13 +82,41 @@ public class Spreadsheet {
* A method for reading in data from a CSV file.
* @param path The file to read.
* @param separator The char used to split up the input, e.g. a comma or a semicolon.
* @param startCellName The upper left cell where data from the CSV file should be inserted.
* @exception IOException If path does not exist.
*/
public void readCsv(String path, char separator, String startCellName) throws FileNotFoundException {
// TODO: implement this
}
public void readCsv(String path, String separator) throws FileNotFoundException {
ArrayList<String> lines = new ArrayList<>();
Scanner scan = new Scanner(new File(path));
while (scan.hasNextLine()) {
lines.add(scan.nextLine());
}
String[] linesArray = lines.toArray(new String[lines.size()]);
ArrayList<int[]> values = new ArrayList<>();
for(int i = 0; i < linesArray.length; i++) {
//System.out.println(linesArray[i]);
String[] zwischenSchritt = linesArray[i].split(separator);
for (int j = 0; j < zwischenSchritt.length; j++) {
System.out.println(zwischenSchritt[j]);
if(zwischenSchritt[j].startsWith("=")){
values.add(new int[]{i, j});
}else{
this.put(i, j, zwischenSchritt[j]);
}
}
for(int[] cell : values){
String[] value = linesArray[cell[0]].split(",");
String formula = value[cell[1]];
this.put(cell[0], cell[1], formula);
}
scan.close();
}
}
/**
* A method for saving data to a CSV file.
* @param path The file to write.
@ -307,8 +342,8 @@ public class Spreadsheet {
/**
* This method calculates the result of a "normal" algebraic expression. It only needs to support
* expressions like =B4 or =2+A3-B2, i.e. only with int numbers and other cells and with plus,
* minus, times, split only. An expression always starts with either a number or a cell name. If it
* continues, it is guaranteed that this is followed by an operator and either a number or a
* minus, times, split only. An expression always starts with either a number or a cell name. If it
* continues, it is guaranteed that this is followed by an operator and either a number or a
* cell name again. It is NOT required to implement dot before dash or parentheses in formulas.
* @param formula The expression to be evaluated.
* @return The result calculated.