dymik739/oop-labs-collection
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main class file code fixes

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dymik739 2023-03-11 13:14:02 +02:00
parent 60c578b8bf
commit 4ba6832845
1 changed files with 42 additions and 35 deletions
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45
labs/2/Main.java
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@ -1,18 +1,19 @@
import java.util.Objects; import java.util.Objects;
import java.lang.Exception;
import java.io.File; import java.io.File;
import java.io.FileNotFoundException; import java.io.FileNotFoundException;
import java.util.Scanner; import java.util.Scanner;
import java.io.FileWriter;
import java.net.URL; import java.net.URL;
import java.io.BufferedInputStream; import java.io.BufferedInputStream;
import java.io.FileOutputStream;
public class Main { public class Main {
private boolean disable_networking = false;
public void main(String[] args) { public static void main(String[] args) {
boolean help_enqueued = false; boolean help_enqueued = false;
boolean allow_networking = true;
int verbosity = 1; int verbosity = 1;
int p = 0; int p = 0;
@ -20,13 +21,14 @@ public class Main {
try { try {
if (Objects.equals(args[p], "-h")) { if (Objects.equals(args[p], "-h")) {
help_enqueued = true; help_enqueued = true;
p += 1;
} }
else if (Objects.equals(args[p], "-v")) { else if (Objects.equals(args[p], "-v")) {
verbosity = Integer.parseInt(args[p+1]); verbosity = Integer.parseInt(args[p+1]);
p += 2; p += 2;
} }
else if (Objects.equals(args[p], "--offline")) { else if (Objects.equals(args[p], "--offline")) {
disable_networking = true; allow_networking = false;
p += 2; p += 2;
} }
else { else {
@ -42,48 +44,53 @@ public class Main {
} }
if (help_enqueued) { if (help_enqueued) {
printHelp(); printHelp(allow_networking);
System.exit(0); System.exit(0);
} }
} }
public fetchResource(String remote_url, String output_filename) { private static void fetchResource(String remote_url, String output_filename) {
try {
BufferedInputStream in = new BufferedInputStream(new URL(remote_url).openStream()); BufferedInputStream in = new BufferedInputStream(new URL(remote_url).openStream());
FileOutputStream fileOutputStream = new FileOutputStream() FileOutputStream fileOutputStream = new FileOutputStream(output_filename);
byte dataBuffer[] = new byte[1024]; byte dataBuffer[] = new byte[1024];
int bytesRead; int bytesRead;
while ((bytesRead = in.read(dataBuffer, 0, 1024)) != -1) { while ((bytesRead = in.read(dataBuffer, 0, 1024)) != -1) {
fileOutputStream.write(dataBuffer, 0, bytesRead); fileOutputStream.write(dataBuffer, 0, bytesRead);
} }
} catch (Exception e) {
System.out.println("[ERROR] Failed to fetch resource " + output_filename + "from " + remote_url + " due to the following exception: " + e);
}
} }
public printHelp() { private static void printHelp(boolean allow_net) {
String help_text = "";
try { try {
File help_file = new File("src/help.txt"); File help_file = new File("src/help.txt");
Scanner help_file_scanner = new Scanner(help_file);
} catch (FileNotFoundException e) { if (!help_file.exists()) {
System.err.println("[WARN] Help file missing."); System.err.println("[WARN] Help file is missing.");
if (!disable_networking) { if (allow_net) {
System.err.println("[INFO] Trying to recover it from the git server"); System.err.println("[INFO] Trying to recover it from the git server");
fetchResource("http://139.162.162.130:3000/", "src/help.txt"); fetchResource("http://139.162.162.130:3000/dymik739/oop-labs-collection/raw/branch/lab2-dev/labs/2/src/help.txt", "src/help.txt");
File help_file = new File("src/help.txt");
Scanner help_file_scanner = new Scanner(help_file);
} else { } else {
System.err.println("[INFO] --offline flag is set, not recovering"); System.err.println("[INFO] Networking is disabled, not recovering");
System.exit(1); System.exit(1);
} }
} }
Scanner help_file_scanner = new Scanner(help_file);
String help_text = "";
while (help_file_scanner.hasNextLine()) { while (help_file_scanner.hasNextLine()) {
help_text += help_file_scanner.nextLine(); help_text += help_file_scanner.nextLine();
} }
help_file_scanner.close(); help_file_scanner.close();
System.out.println(help_text); System.out.println(help_text);
} catch (Exception e) {
System.out.println("[ERROR] Failed to read help due to the following exception: " + e);
System.exit(1);
}
} }
} }