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108 lines
3.7 KiB
108 lines
3.7 KiB
package mock.dataInput;
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import mock.exceptions.InvalidPolarFileException;
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import mock.model.Polars;
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import shared.model.Bearing;
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import java.io.*;
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import java.util.ArrayList;
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/**
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* Responsible for parsing a polar data file, and creating a Polar data object.
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*/
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public class PolarParser {
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/**
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* Given a filename, this function parses it and generates a Polar object, which can be queried for polar information.
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* @param filename The filename to load and read data from (loaded as a resource).
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* @return A Polar table containing data from the given file.
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*/
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public static Polars parse(String filename) throws InvalidPolarFileException {
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//Temporary table to return later.
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Polars polarTable = new Polars();
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//Open the file for reading.
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InputStream fileStream = PolarParser.class.getClassLoader().getResourceAsStream(filename);
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if (fileStream == null) {
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throw new InvalidPolarFileException("Could not open polar data file: " + filename);
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}
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//Wrap it with buffered input stream to set encoding and buffer.
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InputStreamReader in = null;
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try {
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in = new InputStreamReader(fileStream, "UTF-8");
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} catch (UnsupportedEncodingException e) {
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throw new InvalidPolarFileException("Unsupported encoding: UTF-8", e);
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}
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BufferedReader inputStream = new BufferedReader(in);
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//We expect the polar data file to have the column headings:
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// Tws, Twa0, Bsp0, Twa1, Bsp1, UpTwa, UpBsp, Twa2, Bsp2, Twa3, Bsp3, Twa4, Bsp4, Twa5, Bsp5, Twa6, Bsp6, DnTwa, DnBsp, Twa7, Bsp7
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//and to have 7 rows of data.
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//Angles are expected to be in degrees, and velocities in knots.
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//We read data rows, and split them into arrays of elements.
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ArrayList<String[]> dataRows = new ArrayList<>(7);
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try {
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//Heading row.
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//We skip the heading row by reading it.
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String headingRow = inputStream.readLine();
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//Data rows.
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while (inputStream.ready()) {
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//Read line.
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String dataRow = inputStream.readLine();
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//Split line.
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String[] dataElements = dataRow.split(",");
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//Add to collection.
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dataRows.add(dataElements);
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}
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} catch (IOException e) {
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throw new InvalidPolarFileException("Could not read from polar data file: " + filename, e);
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}
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//Finished reading in data, now we need to construct polar rows and table from it.
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//For each row...
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int rowNumber = 0;
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for (String[] row : dataRows) {
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//For each pair of columns (the pair is angle, speed).
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//We start at column 1 since column 0 is the wind speed column.
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for (int i = 1; i < row.length; i += 2) {
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//Add angle+speed=velocity estimate to polar table.
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try {
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//Add the polar value to the polar table
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double windSpeedKnots = Double.parseDouble(row[0]);
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double angleDegrees = Double.parseDouble(row[i]);
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Bearing angle = Bearing.fromDegrees(angleDegrees);
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double boatSpeedKnots = Double.parseDouble(row[i + 1]);
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polarTable.addEstimate(windSpeedKnots, angle, boatSpeedKnots);
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} catch (NumberFormatException e) {
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throw new InvalidPolarFileException("Could not convert (Row,Col): (" + rowNumber + "," + i +") = " + row[i] + " to a double.", e);
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}
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}
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//Increment row number.
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rowNumber++;
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}
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return polarTable;
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}
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}
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