93 lines
2.9 KiB
Java
93 lines
2.9 KiB
Java
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.util.NoSuchElementException;
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import java.util.Scanner;
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/**
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* Parses the temperature and date from a file given as a string to the file
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* @author Isaac Shoebottom (3429069)
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*/
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public class TemperatureParser {
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private Scanner sc;
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private int counterDateTime = -1;
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private int counterTemperature = -1;
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private double temperature;
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private String date;
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/**
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* Constructor for the parser
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* Measures the index of the date/time and temperature in the csv file
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* @param filename The filename of the csv file to be parsed.
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*/
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TemperatureParser(String filename) {
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try {
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sc = new Scanner(new File(filename), "UTF-8").useDelimiter("\",\"");
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} catch (FileNotFoundException exception) {
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System.out.println("File not found, the file might have been typed incorrectly");
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System.out.print("Use tab to autocomplete a filename when in the same directory as the program");
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System.exit(1);
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}
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int counter = 1;
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String field;
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while (sc.hasNext() && counterTemperature == -1 | counterDateTime == -1) {
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field = sc.next();
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if (field.equals("Date/Time (LST)"))
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counterDateTime = counter;
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if (field.equals("Temp (°C)"))
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counterTemperature = counter;
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counter++;
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}
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sc.nextLine();
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}
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/**
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* Parses a line of a csv and gets the date/time and temperature
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* @throws NoSuchElementException When a line is incomplete or a field is empty in the csv spreadsheet this error is thrown
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*/
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void parseLine() throws NoSuchElementException {
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String line = sc.nextLine();
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Scanner scanDate = new Scanner(line).useDelimiter("\",\"");
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Scanner scanTemp = new Scanner(line).useDelimiter("\",\"");
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try {
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for (int i = 1; i < counterDateTime; i++) {
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scanDate.next();
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}
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date = scanDate.next();
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for (int i = 1; i < counterTemperature; i++) {
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scanTemp.next();
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}
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temperature = scanTemp.nextDouble();
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}
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catch (NoSuchElementException exception) {
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System.out.println("Invalid entry at: " + date);
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}
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}
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/**
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* Checks if there is a value next
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* @return boolean if there is a next value true if not false
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*/
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boolean parseHasNext() {
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return sc.hasNext();
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}
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/**
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* Gets there temperature that was most recently parsed
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* @return The temperature that was most recently parsed as a double
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*/
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public double getTemperature() {
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return temperature;
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}
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/**
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* Gets the date that was most recently parsed
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* @return The date/time that was most recently parsed
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*/
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public String getDate() {
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return date;
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}
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}
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