forked from hummel/PR1-Spreadsheet
425 lines
11 KiB
Java
425 lines
11 KiB
Java
package de.hs_mannheim.informatik.spreadsheet;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.Scanner;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import java.util.ArrayList;
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/**
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* A simplified spreadsheet class for the PR1 programming lab at Hochschule Mannheim.
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* One aspect worth mentioning is that it only supports long numbers, not doubles.
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*p
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* @author Oliver Hummel
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*/
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public class Spreadsheet {
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Cell[][] cells;
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/**
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* Constructor that creates a Spreadsheet of size rows * cols.
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* @param rows number of rows
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* @param cols number of columns
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*/
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public Spreadsheet(int rows, int cols) {
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// TODO limit the maximum size on 99 (1..99) rows and 26 (A..Z) columns
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if (rows > 99) {
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rows = 99;
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} else if (rows <= 0) {
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rows = 1;
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}
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if (cols > 26) {
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cols = 26;
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} else if (cols <= 0) {
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cols = 1;
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}
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cells = new Cell[rows][cols];
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for (int r = 0; r < rows; r++)
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for (int c = 0; c < cols; c++)
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cells[r][c] = new Cell();
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}
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// -----
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// retrieve or change values of cells
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private String get(int row, int col) {
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return cells[row][col].getValue();
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}
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public String get(String cellName) {
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cellName = cellName.toUpperCase();
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return get(getRow(cellName), getCol(cellName));
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}
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private void put(int row, int col, String value) {
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if (!value.startsWith("="))
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cells[row][col].setValue(value);
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else {
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cells[row][col].setFormula(value);
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evaluateCell(row, col);
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}
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}
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public void put(String cellName, String value) {
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cellName = cellName.toUpperCase();
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put(getRow(cellName), getCol(cellName), value);
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}
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private int getCol(String cellName) {
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int merker = 0;
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for (int i = 0; i < cellName.length(); i++) {
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if (cellName.charAt(i) >= 'A' && cellName.charAt(i) <= 'Z') {
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merker = (merker * 10) + (cellName.charAt(i) - ('A'-1));
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} else {
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break;
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}
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}
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return merker-1;
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}
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private int getRow(String cellName) {
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int merker = 0;
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for (int i = 0; i < cellName.length(); i++) {
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if (!(cellName.charAt(i) >= 'A' && cellName.charAt(i) <= 'Z')) {
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merker = (merker * 10) + (cellName.charAt(i) - '0');
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}
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}
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return merker-1;
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}
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public boolean zelleneingabe_pruefen(String a) {
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if (a.length() < 2) { //es soll eine einzelne Zelle angesprochen werde, also muss dafür die länge >2 sein
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return false;
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}
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if (getRow(a) < 0 || getRow(a) >= cells.length) { //überprüfung ob die eingabe in die rows länge passt
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return false;
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}
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if (getCol(a) < 0 || getCol(a) >= cells[0].length) { //überprüfung ob die eingabe in die Columns länge passt
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return false;
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}
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return true;
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}
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// -----
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// business logic
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/**
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* A method for reading in data from a CSV file.
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* @param path The file to read.
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* @param separator The char used to split up the input, e.g. a comma or a semicolon.
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* @param startCellName The upper left cell where data from the CSV file should be inserted.
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* @return Nothing.
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* @exception IOException If path does not exist.
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*/
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public void readCsv(String path, char separator, String startCellName) throws FileNotFoundException {
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// TODO: implement this
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ArrayList<String> lines = readFile(path);
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String[] einzelnde_lines = new String[lines.size()];
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int row_startcell = getRow(startCellName);
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int col_startcell = getCol(startCellName);
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String[][] zwischenspeicher = new String[cells.length - row_startcell][cells[0].length - col_startcell];
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for (int i = 0; i < einzelnde_lines.length; i++) {
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zwischenspeicher[i] = lines.get(i).split(separator+""); // +"" um aus dem Char ein String zu machen
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for (int j = 0; j < zwischenspeicher[i].length; j++) {
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put(row_startcell+i,col_startcell+j,zwischenspeicher[i][j]);
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}
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}
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}
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public static ArrayList<String> readFile(String path) throws FileNotFoundException {
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ArrayList<String> lines = new ArrayList<>();
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Scanner sc = new Scanner(new File(path));
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while (sc.hasNextLine()) {
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lines.add(sc.nextLine());
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}
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sc.close();
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return lines;
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}
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/**
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* A method for saving data to a CSV file.
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* @param path The file to write.
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* @return Nothing.
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* @exception IOException If path does not exist.
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*/
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public void saveCsv(String path) throws FileNotFoundException {
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PrintWriter out = new PrintWriter(path);
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for (Cell[] row : cells) {
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for (Cell cell : row) {
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if (!cell.getFormula().isEmpty())
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out.print("=" + cell.getFormula());
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else
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out.print(cell.getValue());
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if (cell != row[cells[0].length-1]) // "[0]" -> nimmt sonst die falsche Länge!
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out.print(",");
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}
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out.println();
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}
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out.close();
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}
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/**
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* This method does the actual evaluation/calcluation of a specific cell
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* @param cellName the name of the cell to be evaluated
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* @return Nothing.
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*/
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private void evaluateCell(int row, int col) {
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String formula = cells[row][col].getFormula();
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String result = "";
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if (formula.startsWith("SUMME(")) // e.g. SUMME(A3:A8)
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result = "" + sum(formula.substring(6, 8), formula.substring(9, 11)); // TODO adapt to cells with two digits
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else if (formula.startsWith("PRODUKT(")) // e.g. PRODUKT(A3:B9)
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result = "" + pro(formula.substring(8, 10), formula.substring(11, 13));
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else if (formula.startsWith("MITTELWERT(")) // e.g. MITTELWERT(A3:A5)
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result = "" + mittelwert(formula.substring(11, 13), formula.substring(14, 16));
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else if (formula.startsWith("STABW(")) // e.g. STABW(C6:D8) -> Standardabweichung
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result = "TODO"; // TODO
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else if (formula.startsWith("MIN(")) // e.g. MIN(C13:H13) -> kleinster Wert
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result = "" + min(formula.substring(4, 6), formula.substring(7, 9));
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else if (formula.startsWith("MAX(")) // e.g. MAX(A1:A10) -> größter Wert
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result = "" + max(formula.substring(4, 6), formula.substring(7, 9));
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else if (!formula.isEmpty()) {
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try {
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result = "" + calculate(formula); //geht nicht?
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} catch(ArithmeticException ae) {
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result = "exc.";
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}
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}
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cells[row][col].setValue("" + result);
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}
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/**
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* Method for calculating the sum of a rectangular block of cells, such as from A1 to B3.
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* @param startCellName The name of the cell in the upper left corner of the rectangle.
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* @param endCellName The name of the cell in the lower right corner of the rectangle.
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* @return The sum calculated.
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*/
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private long sum(String startCellName, String endCellName) {
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int startCellRow = getRow(startCellName);
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int startCellCol = getCol(startCellName);
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int endCellRow = getRow(endCellName);
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int endCellCol = getCol(endCellName);
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long res = 0;
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for (int i = startCellRow; i <= endCellRow; i++) {
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for (int j = startCellCol; j <= endCellCol; j++) {
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res = res + (Integer.parseInt(cells[i][j].getValue()));
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}
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}
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return res;
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}
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private long pro(String startCellName, String endCellName) {
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int startCellRow = getRow(startCellName);
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int startCellCol = getCol(startCellName);
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int endCellRow = getRow(endCellName);
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int endCellCol = getCol(endCellName);
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long res = 0;
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for (int i = startCellRow; i <= endCellRow; i++) {
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for (int j = startCellCol; j <= endCellCol; j++) {
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if (res == 0) {
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res = Integer.parseInt(cells[i][j].getValue());
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} else {
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res = res * (Integer.parseInt(cells[i][j].getValue()));
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}
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}
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}
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return res;
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}
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private long min(String startCellName, String endCellName) {
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int startCellRow = getRow(startCellName);
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int startCellCol = getCol(startCellName);
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int endCellRow = getRow(endCellName);
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int endCellCol = getCol(endCellName);
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long res = Long.MAX_VALUE;
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long merker;
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for (int i = startCellRow; i <= endCellRow; i++) {
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for (int j = startCellCol; j <= endCellCol; j++) {
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merker = Integer.parseInt(cells[i][j].getValue());
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if (merker < res) {
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res = merker;
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}
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}
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}
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return res;
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}
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private long max(String startCellName, String endCellName) {
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int startCellRow = getRow(startCellName);
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int startCellCol = getCol(startCellName);
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int endCellRow = getRow(endCellName);
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int endCellCol = getCol(endCellName);
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long res = Long.MIN_VALUE;
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long merker;
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for (int i = startCellRow; i <= endCellRow; i++) {
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for (int j = startCellCol; j <= endCellCol; j++) {
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merker = Integer.parseInt(cells[i][j].getValue());
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if (merker > res) {
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res = merker;
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}
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}
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}
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return res;
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}
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private long mittelwert(String startCellName, String endCellName) {
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int startCellRow = getRow(startCellName);
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int startCellCol = getCol(startCellName);
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int endCellRow = getRow(endCellName);
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int endCellCol = getCol(endCellName);
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long anzahl = 0;
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long res = 0;
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for (int i = startCellRow; i <= endCellRow; i++) {
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for (int j = startCellCol; j <= endCellCol; j++) {
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res = res + (Integer.parseInt(cells[i][j].getValue()));
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anzahl++;
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}
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}
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res = res/anzahl;
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return res;
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}
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/**
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* This method calculates the result of a "normal" algebraic expression. It only needs to support
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* expressions like =B4 or =2+A3-B2, i.e. only with int numbers and other cells and with plus,
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* minus, times, split only. An expression always starts with either a number or a cell name. If it
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* continues, it is guaranteed that this is followed by an operator and either a number or a
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* cell name again. It is NOT required to implement dot before dash or parentheses in formulas.
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* @param formula The expression to be evaluated.
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* @return The result calculated.
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*/
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private long calculate(String formula) throws ArithmeticException {
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Matcher m = Pattern.compile("([A-Z][0-9]*)|[-\\+\\*/]|[0-9]*").matcher(formula);
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long res = 0;
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// TODO implement
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int merker = 0;
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int zaehler = 0;
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int neue_zahl = 0;
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// uncomment the following to see an example how the elements of a formula can be accessed
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while (m.find()) { // m.find() must always be used before m.group()
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String s = m.group();
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if (!s.isEmpty()) {
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System.out.println(s);
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zaehler++;
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switch (zaehler){
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case 1:
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try {
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res = Integer.parseInt(s);
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}catch (Exception ignored){
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res = Integer.parseInt(get(s));
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}
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break;
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case 2:
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switch(s) {
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case "+":
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merker = 1;
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break;
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case "-":
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merker = 2;
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break;
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case "*":
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merker = 3;
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break;
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case "/":
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merker = 4;
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break;
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default:
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System.out.println("ERROR");
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break;
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}
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break;
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case 3:
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try {
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neue_zahl = Integer.parseInt(s);
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}catch (Exception ignored){
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neue_zahl = Integer.parseInt(get(s));
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}
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res = rechne(res, merker, neue_zahl);
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zaehler = 1;
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break;
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}
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}
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}
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return res;
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}
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private long rechne(long a, int merker, int b) {
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switch(merker){
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case 1:
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return a + b;
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case 2:
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return a - b;
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case 3:
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return a * b;
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case 4:
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return a / b;
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default:
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System.out.println("ERROR");
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break;
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}
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return 0;
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}
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// -----
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public String toString() {
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StringBuilder sb = new StringBuilder();
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sb.append(" ");
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for (int i = 0; i < cells[0].length; i++) { // "[0]" -> nimmt sonst die falsche Länge!
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sb.append(" " + (char)('A'+ i) + " | ");
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}
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int rc = 1;
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for (Cell[] r : cells) {
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sb.append(System.lineSeparator());
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sb.append(String.format("%2s", rc++) + ": ");
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for (Cell c : r) {
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sb.append(c + " | ");
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}
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}
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return sb.toString();
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}
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} |