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package main;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.Scanner;
/**
*
* @author s123188
*/
public class FarmShell {
private final Scanner scanner = new Scanner(System.in);
Analyzor analyzor;
private void printPrompt() {
System.out.print("$ ");
}
/**
* Processes commands from stdin until the exit command is received or EOF.
*/
public void process_forever() {
System.err.println("Entering interactive shell, type 'help' for help "
+ "or 'exit' to leave. '.' repeats the previous interactive "
+ "command.");
// print prompt for reading first command
printPrompt();
String lastLine = "";
while (scanner.hasNextLine()) {
String line = scanner.nextLine().trim();
// repeat last command
if (line.equals(".")) {
line = lastLine;
}
if (!execute(line)) {
// requested to terminate
break;
}
if (!line.isEmpty()) {
lastLine = line;
}
// print prompt for reading next line
printPrompt();
}
// prevent corrupted compressed files when exiting without a command
throw new NoSuchElementException();
}
public boolean execute(String cmd) {
String[] args = cmd.trim().split("\\s+", 2);
if (!args[0].isEmpty()) {
// non-empty command, let's see whether it makes sense?
return execute(args);
}
return true;
}
/**
* Executes a command with optional parameters.
*
* @param args An array with the first argument containing the command with
* optional parameters in following arguments.
* @return true if more commands are allowed to be executed, false
* otherwise.
*/
public boolean execute(String[] args) {
try {
Command command = Command.fromString(args[0]);
String[] params = Arrays.copyOfRange(args, 1, args.length);
execute(command, params);
} catch (IllegalArgumentException ex) {
System.err.println(ex.getMessage());
} catch (IOException ex) {
System.err.println("Command " + args[0] + " failed with " + ex);
ex.printStackTrace();
} catch (NoSuchElementException ex) {
// thrown by the "exit" command to signal exit
return false;
} catch (SQLException ex){
System.err.println("such " + ex);
}
// another satisfied customer, next!
return true;
}
enum Command {
query("make a query to the database; needed to do analysis", 1),
filterbots("marks all users as bot or not", 1),
sentiment("analyzes all tweets on positivity (about a brand)", 1),
wordcloud("makes a wordcloud of the text of the tweets", 1),
exit("Returns to shell"),
help("Get help");
private final String description;
private final int paramCount;
Command(String description) {
this.description = description;
this.paramCount = 0;
}
Command(String description, int paramCount) {
this.description = description;
this.paramCount = paramCount;
}
public String getDescription() {
return description;
}
public int getParamCount() {
return paramCount;
}
public static Command fromString(String command) {
for (Command cmd : values()) {
if (cmd.name().equals(command)) {
return cmd;
}
}
throw new IllegalArgumentException("Unrecognized command. Hint: help");
}
};
private final String[] HELP = new String[]{
"Interactive TweetShell",
"",
"Available commands:"
};
private void execute(Command command, String[] params) throws SQLException, IOException {
if (params.length < command.getParamCount()) {
throw new IllegalArgumentException("Expected "
+ command.getParamCount() + " parameters, got only "
+ params.length);
}
switch (command) {
case query:
System.err.println("isn't supported anymore, now enter query after analysis type");
break;
case filterbots:
System.out.println("not yet implemented");
break;
case sentiment:
analyzor.sentimentAnalysis(params[0]);
break;
case wordcloud:
analyzor.makeWordCloud(params[0]);
break;
case help:
for (String line : HELP) {
System.out.println(line);
}
for (Command cmd : Command.values()) {
System.out.printf(" %-10s", cmd.name());
if (!cmd.getDescription().isEmpty()) {
System.out.print(" " + cmd.getDescription());
}
if (cmd.getParamCount() == 1) {
System.out.print(" (1 arg)");
} else if (cmd.getParamCount() > 1) {
System.out.printf(" (%d args)", cmd.getParamCount());
}
System.out.println();
}
break;
case exit:
throw new NoSuchElementException();
default:
throw new AssertionError(command.name());
}
}
}
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