234 lines
6.5 KiB
Java
234 lines
6.5 KiB
Java
package de.hs_mannheim.informatik.spreadsheet;
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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.regex.Matcher;
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import java.util.regex.Pattern;
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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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*
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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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}
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if (cols>26) {
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cols=26;
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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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return cellName.charAt(0) - 'A';
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}
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private int getRow(String cellName) {
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if(cellName.length()==3)
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return Integer.parseInt((cellName.charAt(1)+"")+(cellName.charAt(2)+""))-1;
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else
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return cellName.charAt(1) - '1';
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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 starCellName 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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}
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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.length-1])
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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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if(formula.length()==14)
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result = "" + sum(formula.substring(6, 9), formula.substring(10, 13));
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else if(formula.length()==13)
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result = "" + sum(formula.substring(6, 8), formula.substring(9, 12));
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else
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result = "" + sum(formula.substring(6, 8), formula.substring(9, 11));
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else if (formula.startsWith("PRODUKT(")) // e.g. PRODUKT(A3:B9)
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result = "TODO"; // TODO
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else if (formula.startsWith("MITTELWERT(")) // e.g. MITTELWERT(A3:A5)
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result = "TODO"; // TODO
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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) -> größter Wert
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result = "TODO"; // TODO
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else if (formula.startsWith("MAX(")) // e.g. MAX(A1:A10) -> Standardabweichung
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result = "TODO"; // TODO
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else if (!formula.isEmpty()) {
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try {
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result = "" + calculate(formula);
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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 sum=0;
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int startCellRow;
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int endCellRow;
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if(startCellName.length()==3)
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startCellRow=Integer.parseInt((startCellName.charAt(1)+"")+(startCellName.charAt(2)+""))-1;
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else
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startCellRow=startCellName.charAt(1)-'1';
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if(endCellName.length()==3)
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endCellRow=Integer.parseInt((endCellName.charAt(1)+"")+(endCellName.charAt(2)+""))-1;
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else
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endCellRow=endCellName.charAt(1)-'1';
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for(int i=startCellName.charAt(0)-'A'; i<=endCellName.charAt(0)-'A'; i++) {
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for(int j=startCellRow; j<=endCellRow; j++) {
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if(cells[j][i].isEmpty()) {
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continue;
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}
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sum+=Integer.parseInt(cells[j][i].getValue());
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}
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}
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return sum;
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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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// 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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}
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}
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return res;
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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++) {
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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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} |