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No commits in common. "37f8e9dbf6a9a6b53c09ae73876bf1e23cea642a" and "ded099dbac9afbb62d8df88f6086c4bb22e535a1" have entirely different histories.
37f8e9dbf6
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ded099dbac
159
labs/2/Main.java
159
labs/2/Main.java
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import java.util.Objects;
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import java.lang.Exception;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.util.Scanner;
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import java.net.URL;
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import java.io.BufferedInputStream;
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import java.io.FileOutputStream;
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import java.util.ArrayList;
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public class Main {
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public static void main(String[] args) {
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boolean help_enqueued = false;
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boolean allow_networking = true;
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String matrix_file_name = "";
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int p = 0;
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while (p < args.length) {
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try {
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if (Objects.equals(args[p], "-h")) {
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help_enqueued = true;
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p += 1;
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}
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else if (Objects.equals(args[p], "--offline")) {
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allow_networking = false;
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p += 2;
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}
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else {
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matrix_file_name = args[p++];
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}
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}
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catch (Exception e) {
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System.err.println("[ERROR] Exception while parsing CLI arguments: " + e);
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System.err.println("[ERROR] Aborting further execution.");
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System.exit(1);
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}
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}
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if (help_enqueued) {
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printHelp(allow_networking);
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System.exit(0);
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}
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if (Objects.equals("", matrix_file_name)) {
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System.err.println("[WARN] No filename specified to read from, using default one");
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matrix_file_name = "random_matrix.txt";
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}
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File matrix_file = new File(matrix_file_name);
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if (!matrix_file.exists()) {
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if (allow_networking) {
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System.err.println("[WARN] File is missing, downloading random matrix from the server");
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fetchResource("http://lab2.kpi.dev:16554/matrix.py", matrix_file_name);
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} else {
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System.err.println("[WARN] File is missing; networking is disabled, not recovering");
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System.exit(1);
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}
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}
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// loading matrix data from file
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int[][] raw_m = loadMatrixFromFile(matrix_file);
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// creating original matrix object
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System.out.println("Original matrix:");
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Matrix m = new Matrix();
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m.init(raw_m);
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// transposing
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m.transpose();
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System.out.println("\nTransposed matrix:");
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m.print();
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// avg
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System.out.println("\nAverage value is " + m.getAvg());
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}
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private static void fetchResource(String remote_url, String output_filename) {
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try {
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BufferedInputStream in = new BufferedInputStream(new URL(remote_url).openStream());
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FileOutputStream fileOutputStream = new FileOutputStream(output_filename);
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byte dataBuffer[] = new byte[1024];
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int bytesRead;
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while ((bytesRead = in.read(dataBuffer, 0, 1024)) != -1) {
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fileOutputStream.write(dataBuffer, 0, bytesRead);
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}
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} catch (Exception e) {
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System.out.println("[ERROR] Failed to fetch resource " + output_filename + "from " + remote_url + " due to the following exception: " + e);
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}
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}
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private static void printHelp(boolean allow_net) {
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try {
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File help_file = new File("src/help.txt");
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if (!help_file.exists()) {
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System.err.println("[WARN] Help file is missing.");
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if (allow_net) {
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System.err.println("[INFO] Trying to recover it from the git server");
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fetchResource("http://lab2.kpi.dev:3000/dymik739/oop-labs-collection/raw/branch/lab2-dev/labs/2/src/help.txt", "src/help.txt");
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} else {
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System.err.println("[INFO] Networking is disabled, not recovering");
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System.exit(1);
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}
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}
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Scanner help_file_scanner = new Scanner(help_file);
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while (help_file_scanner.hasNextLine()) {
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System.out.println(help_file_scanner.nextLine());
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}
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help_file_scanner.close();
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} catch (Exception e) {
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System.out.println("[ERROR] Failed to read help due to the following exception: " + e);
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System.exit(1);
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}
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}
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private static int[][] loadMatrixFromFile(File matrix_file) {
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try {
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Scanner matrix_file_reader = new Scanner(matrix_file);
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ArrayList<String> raw_matrix_lines = new ArrayList<String>();
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while (matrix_file_reader.hasNextLine()) {
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raw_matrix_lines.add(matrix_file_reader.nextLine());
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}
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ArrayList<String[]> baked_matrix_lines = new ArrayList<String[]>();
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for (String s : raw_matrix_lines) {
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baked_matrix_lines.add(s.split(" "));
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}
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int ref_length = baked_matrix_lines.get(0).length;
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int[][] baked_matrix = new int[baked_matrix_lines.size()][ref_length];
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for (int i = 0; i < baked_matrix_lines.size(); i++) {
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if (baked_matrix_lines.get(i).length != ref_length) {
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System.err.println("[ERROR] Matrix lines have different length! Assuming the matrix was corrupted");
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System.exit(2);
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}
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for (int j = 0; j < baked_matrix_lines.get(i).length; j++) {
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baked_matrix[i][j] = Integer.parseInt(baked_matrix_lines.get(i)[j]);
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}
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}
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return baked_matrix;
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} catch (Exception e) {
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System.err.println("[ERROR] Failed to read matrix from file " + matrix_file.getName());
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System.exit(1);
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return new int[1][1];
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}
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}
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}
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public class Matrix {
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private int[][] m;
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public void init(int[][] base_m) {
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this.m = base_m;
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}
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public int[][] getMatrix() {
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return this.m;
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}
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public void print() {
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for (int[] ml : this.m) {
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for (int e : ml) {
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System.out.printf("%4d ", e);
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}
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System.out.println();
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}
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}
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public void transpose() {
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print();
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if (this.m[0].length != this.m.length) {
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int new_h = this.m[0].length;
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int new_w = this.m.length;
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int[][] new_m = new int[new_h][new_w];
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for (int i = 0; i < this.m.length; i++) {
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for (int j = 0; j < this.m[i].length; j++) {
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new_m[j][i] = this.m[i][j];
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}
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}
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this.m = new_m;
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} else {
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// if a matrix is square, there is no need to
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// make a new one
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int temp_value_holder;
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for (int i = 0; i < this.m.length; i++) {
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for (int j = 0; j < i; j++) {
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temp_value_holder = this.m[i][j];
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this.m[i][j] = this.m[j][i];
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this.m[j][i] = temp_value_holder;
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}
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}
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}
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}
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public double getAvg() {
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double total = 0;
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for (int[] ml : this.m) {
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for (int e : ml) {
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total += e;
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}
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}
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return total / (this.m.length * this.m[0].length);
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}
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}
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Usage: java Main [options] [matrix_file]
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Options:
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-h Output this help text
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--offline Prevent any possible attempt to fetch missing files from the server
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#!/bin/sh
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sed -i 's/int/double/g;s/prdouble/print/g;s/Integer.parseInt/Double.parseDouble/g;s/for (double i/for (int i/g;s/for (double j/for (int j/g;s/matrix.py/double-matrix.py/g;s/double p/int p/g;s/double bytesRead/int bytesRead/g;s/double ref_length/int ref_length/g;s/double new/int new/g;s/%4d/%4.3f/g' Matrix.java Main.java
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javac Main.java Matrix.java
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rm random_matrix.txt
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import random
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print("Content-Type: text/plain\n\n" + "\n".join([" ".join(list(map(str, [round((random.random()-0.5)*200, 4) for i in range(7)]))) for i in range(7)]))
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import random
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print("Content-Type: text/plain\n\n" + "\n".join([" ".join(list(map(str, [random.randint(-40, 40) for i in range(7)]))) for i in range(7)]))
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