433 lines
13 KiB
Java
433 lines
13 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.ArrayList;
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import java.util.Arrays;
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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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/**
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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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*
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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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if(rows>99)
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rows = 99;
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else if(rows<1)
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rows = 1;
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if(cols < 1)
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cols = 1;
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else if(cols > 26)
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cols = 26;
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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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public String getCellName(int row, int col) {
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return "" + ((char) ('A' + col)) + (row+1);
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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()>2)
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return Integer.parseInt(""+cellName.charAt(1)+cellName.charAt(2)) - 1;
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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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*
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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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* @throws 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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Scanner sc = new Scanner(new File(path));
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ArrayList<String> memList = new ArrayList<>();
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while (sc.hasNextLine()) {
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memList.add(sc.nextLine());
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}
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String[][] memArr = new String[memList.size()][];
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for(int i = 0; i < memList.size(); i++)
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memArr[i] = (memList.get(i)).split(String.valueOf(separator));
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for (int r = getRow(startCellName); r < memList.size(); r++)
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for (int c = getCol(startCellName); c < memList.get(0).length(); c++)
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if(c<memArr[r].length)
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put(r, c, memArr[r][c]);
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sc.close();
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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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*
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* @param path The file to write.
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* @return Nothing.
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* @throws 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])
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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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*
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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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String substringStartCell1 = formula.substring(formula.length() - 6, formula.length() - 4);
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String substringStart2 = formula.substring(formula.length() - 6, formula.length() - 3);
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String substringEndCell = formula.substring(formula.length() - 3, formula.length() - 1);
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if (formula.startsWith("SUMME(")) // e.g. SUMME(A3:A8)
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if(formula.length()<13)
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result = "" + sum(substringStartCell1, substringEndCell);
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else if(formula.length()<14&&substringStart2.contains(":"))
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result = "" + sum(substringStartCell1, substringEndCell);
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else if(formula.length()<14&&!substringStart2.contains(":"))
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result = "" + sum(substringStart2, substringEndCell);
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else if(formula.length()<15)
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result = "" + sum(substringStart2, substringEndCell);
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else
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result = "0";
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else if (formula.startsWith("PRODUKT(")) // e.g. PRODUKT(A3:B9)
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if(formula.length()<15)
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result = "" + product(substringStartCell1, substringEndCell);
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else if(formula.length()<16&&substringStart2.contains(":"))
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result = "" + product(substringStartCell1, substringEndCell);
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else if(formula.length()<16&&!substringStart2.contains(":"))
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result = "" + product(substringStart2, substringEndCell);
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else if(formula.length()<17)
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result = "" + product(substringStart2, substringEndCell);
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else
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result = "0";
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else if (formula.startsWith("MITTELWERT(")) // e.g. MITTELWERT(A3:A5)
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if(formula.length()<17)
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result = "" + average(substringStartCell1, substringEndCell);
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else if(formula.length()<18&&substringStart2.contains(":"))
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result = "" + average(substringStartCell1, substringEndCell);
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else if(formula.length()<18&&!substringStart2.contains(":"))
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result = "" + average(substringStart2, substringEndCell);
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else if(formula.length()<19)
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result = "" + average(substringStart2, substringEndCell);
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else
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result = "0";
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else if (formula.startsWith("STABW(")) // e.g. STABW(C6:D8) -> Standardabweichung
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if(formula.length()<13)
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result = "" + standardDeviation(substringStartCell1, substringEndCell);
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else if(formula.length()<14&&substringStart2.contains(":"))
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result = "" + standardDeviation(substringStartCell1, substringEndCell);
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else if(formula.length()<14&&!substringStart2.contains(":"))
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result = "" + standardDeviation(substringStart2, substringEndCell);
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else if(formula.length()<15)
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result = "" + standardDeviation(substringStart2, substringEndCell);
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else
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result = "0";
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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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*
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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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long result = 0;
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for(int r = getRow(startCellName); r<getRow(endCellName)+1; r++)
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for(int c = getCol(startCellName); c<getCol(endCellName)+1; c++)
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try {
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result += Long.parseLong(cells[r][c].getValue());
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} catch (NumberFormatException n){}
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return result;
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}
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private long product(String startCellName, String endCellName) {
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long result = Long.parseLong(cells[0][0].getValue());;
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for(int r = getRow(startCellName); r<getRow(endCellName)+1; r++)
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for(int c = getCol(startCellName); c<getCol(endCellName)+1; c++)
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try {
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result *= Long.parseLong(cells[r+1][c+1].getValue());
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} catch (NumberFormatException n){}
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return result;
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}
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private long average(String startCellName, String endCellName){
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long result = 0;
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int counter = 0;
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for(int r = getRow(startCellName); r<getRow(endCellName)+1; r++)
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for(int c = getCol(startCellName); c<getCol(endCellName)+1; c++)
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try {
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result += Long.parseLong(cells[r][c].getValue());
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counter ++;
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} catch (NumberFormatException n){}
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result /= counter;
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return result;
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}
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private double standardDeviation(String startCellName, String endCellName){
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ArrayList<String> cellNames = new ArrayList<>();
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long avg = 0;
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int counter = 0;
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for(int r = getRow(startCellName); r<getRow(endCellName)+1; r++)
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for(int c = getCol(startCellName); c<getCol(endCellName)+1; c++)
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try {
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avg += Long.parseLong(cells[r][c].getValue());
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counter ++;
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cellNames.add(getCellName(r, c));
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} catch (NumberFormatException n){}
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avg /= counter;
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//average
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ArrayList<String> copyCellNames = new ArrayList<>(cellNames);
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double[] frequency = new double[cellNames.size()];
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Arrays.fill(frequency,1);
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ArrayList<Double> relativeFrequency = new ArrayList<>();
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double mem = 0;
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for(int i = 0; i< cellNames.size(); i++) {
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for(int t = 0; t<cellNames.size(); t++){
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if(((get(cellNames.get(i)).isEmpty())&&!(get(cellNames.get(t)).isEmpty()))&&(Double.parseDouble(get(cellNames.get(t)))==0)&&(t!=i)){
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cellNames.remove(t);
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frequency[i]++;
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t = 0;
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}else if((!(get(cellNames.get(i)).isEmpty())&&(get(cellNames.get(t)).isEmpty()))&&(Double.parseDouble(get(cellNames.get(i)))==0)&&(t!=i)){
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cellNames.remove(t);
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frequency[i]++;
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t = 0;
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}else if((get(cellNames.get(i)).isEmpty())&&(get(cellNames.get(t)).isEmpty())&&(t!=i)){
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cellNames.remove(t);
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frequency[i]++;
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t = 0;
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}else if((t!=i)&&(Double.parseDouble(get(cellNames.get(i))))==(Double.parseDouble(get(cellNames.get(t))))){
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cellNames.remove(t);
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frequency[i] ++;
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t = 0;
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}
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}
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}
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//delete all duplicates
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for(int i = 0; i< cellNames.size(); i++)
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relativeFrequency.add(i,frequency[i]/copyCellNames.size());
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if(get(cellNames.get(0)).isEmpty())
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mem = ((0 - avg)*(0 - avg))
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* relativeFrequency.get(0);
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else
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mem = ((Double.parseDouble(get(cellNames.get(0))) - avg)*(Double.parseDouble(get(cellNames.get(0))) - avg))
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* relativeFrequency.get(0);
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for(int i = 1; i<cellNames.size(); i++)
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if(get(cellNames.get(i)).isEmpty())
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mem += ((0 - avg)*(0 - avg))
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* relativeFrequency.get(i);
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else
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mem += ((Double.parseDouble(get(cellNames.get(i))) - avg)*(Double.parseDouble(get(cellNames.get(i))) - avg))
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* relativeFrequency.get(i);
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return Math.sqrt(mem);
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//standardDeviation formula
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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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*
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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 result = 0;
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long currentOperand = 0;
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String currentOperator = "+";
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boolean firstOperator = true;
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while (m.find()) {
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String s = m.group();
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if (s.matches(("[0-9]+")))
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currentOperand = Long.parseLong(s);
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else if ((s.matches("[A-Z][1-9]*") || s.matches("[A-Z][1-9]*+")) && get(s).isEmpty())
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currentOperand = 0;
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else if ((s.matches("[A-Z][1-9]*") || s.matches("[A-Z][1-9]*+"))) {
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currentOperand = Long.parseLong(get(s));
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} else {
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if (!firstOperator) {
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result = evaluateOperator(result, currentOperand, currentOperator);
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} else {
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result = currentOperand;
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firstOperator = false;
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}
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currentOperator = s;
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}
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}
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if (!firstOperator) {
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result = evaluateOperator(result, currentOperand, currentOperator);
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} else
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result = currentOperand;
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return result;
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}
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private long evaluateOperator(long result, long currentOperand, String currentOperator) {
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switch (currentOperator) {
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case "+":
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return result + currentOperand;
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case "-":
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return result - currentOperand;
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case "*":
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return result * currentOperand;
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case "/":
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return result / currentOperand;
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default:
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throw new IllegalArgumentException("Invalid operator: " + currentOperator);
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}
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}
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///--- ui methods
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public void updateSpreadsheet() {
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for (int r = 0; r < cells.length; r++)
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for (int c = 0; c < cells[r].length; c++)
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evaluateCell(r, c);
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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(System.lineSeparator());
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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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for (int i = 0; i < cells[0].length; i++) {
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sb.append("----------------");
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}
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sb.append("------");
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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(" " + String.format("%13s", c) + " |");
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}
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}
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sb.append(System.lineSeparator());
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for (int i = 0; i < cells[0].length; i++) {
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sb.append("----------------");
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}
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sb.append("------");
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sb.append(System.lineSeparator());
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return sb.toString();
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}
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} |