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package main;
import com.google.gson.JsonSyntaxException;
import data.Tweet;
import database.ConnectionBuilder;
import io.FileTweetReader;
import io.ITweetReader;
import io.TweetReader;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* The main class.
*/
public class Main {
/**
* The main method of the application.
*
* @param args the global arguments to pass to the program.
*/
public static void main(String[] args) {
Main main;
try {
main = new Main(args);
} catch (IllegalArgumentException ex) {
System.err.println(ex.getMessage());
System.exit(1);
return;
}
main.run();
}
private String m_filename;
private final ConnectionBuilder cb;
public Main(String[] args) {
// default connection properties
cb = new ConnectionBuilder()
.setServerName("localhost")
.setUsername("postgres")
.setPassword("2IOC02")
.setDbName("Twitter");
/* parse the global options. */
parseGlobalOptions(args);
}
public void run() {
try (Connection connection = cb.create()) {
/* create the object that fills the database */
DataFiller filler = new DataFiller(connection);
ITweetReader reader = null;
try {
if (m_filename == null) {
reader = new TweetReader(System.in);
} else {
reader = new FileTweetReader(m_filename);
}
Tweet tweet;
while ((tweet = reader.getTweet()) != null) {
filler.processTweet(tweet);
}
} catch (JsonSyntaxException ex) {
System.err.println("Got an invalid tweet: " + ex);
} catch (IOException ex) {
System.err.println("Cannot open tweets: " + ex);
} finally {
if (reader != null) {
reader.close();
}
}
} catch (SQLException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE,
"DB error", ex);
}
}
private void parseGlobalOptions(String[] args)
throws IllegalArgumentException {
/* parse global options */
for (int i = 0; i < args.length; i++) {
if ("--help".equals(args[i])) {
printHelp();
System.exit(0);
} else if ("--dbhost".equals(args[i])) {
cb.setServerName(getArg(args, ++i, "--dbhost"));
} else if ("--dbuser".equals(args[i])) {
cb.setUsername(getArg(args, ++i, "--dbuser"));
} else if ("--dbpass".equals(args[i])) {
cb.setPassword(getArg(args, ++i, "--dbpass"));
} else if ("--dbname".equals(args[i])) {
cb.setDbName(getArg(args, ++i, "--dbname"));
} else if (args[i].startsWith("-")) {
throw new IllegalArgumentException("Invalid option: " + args[i]);
} else {
/* This should be the filename */
m_filename = args[i];
}
}
}
/**
* Read an extra option for a command.
*/
private String getArg(String[] params, int index, String name) {
if (index >= params.length) {
System.err.println("Missing argument for parameter " + name);
System.exit(1);
}
return params[index];
}
/**
* Print some useful help messages.
*/
private void printHelp() {
for (String line : HELP) {
System.out.println(line);
}
}
private final static String[] HELP = {
"Usage: java -jar DataFiller.jar [options] [tweets-file]",
"",
"Global options:",
" --help Print this help text.",
" --dbhost HOST Database host (defaults to 'localhost')",
" --dbuser USER Database username (defaults to 'postgres')",
" --dbpass PASS Database password (defaults to '2IOC02')",
" --dbname NAME Database name (defaults to 'Twitter')",
"",
"If no tweets file is given, data will be read from standard input."
};
}
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