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package main;
import java.lang.reflect.Array;
import java.util.Arrays;
import mining.TwitterApi;
/**
* Class that creates executable commands from input.
* @author Maurice Laveaux
*/
public class CommandParser {
// the queue of commands.
private final CommandQueue m_queue;
// the twitter api.
private final TwitterApi m_api;
/**
* Default constructor, requires the TwitterApi
* @param queue A valid CommandQueue that can execute requests.
* @param api the TwitterApi to use for the commands.
*/
public CommandParser(CommandQueue queue, TwitterApi api) {
m_queue = queue;
m_api = api;
}
/**
* Parses a string and creates an executable command for it.
* @param command The string to parse the command from.
*/
final public void parse(final String command) {
// split the code for each space ' '.
String[] seperated = command.split(" ");
// parse the seperated code for each argument.
parse(seperated);
}
/**
* Parses a string and creates an executable command for it.
* @param seperated A space seperated string for each argument.
*/
final public void parse(final String[] seperated) {
if (seperated.length == 0) {
return;
}
// The main command.
String command = seperated[0];
// the first command issued
switch (command) {
case "help":
showFullHelp();
return;
case "-h":
showFullHelp();
return;
case "quit":
// TODO: implement less hack way of quiting the program.
System.exit(0);
default:
break;
}
// there is a command without errors but it was not switched.
if (seperated.length == 1) {
showUsageHelp(command);
return;
}
// commands with multiple parameters
String[] extra = Arrays.copyOfRange(seperated, 1, seperated.length);
if (seperated.length < 3) {
showUsageHelp(extra.toString());
return;
}
String[] parameters = Arrays.copyOfRange(extra, 1, extra.length);
try {
switch (command) {
case "get":
m_queue.add(new RequestCommand(m_api, extra[0], parameters));
return;
}
}
catch (IllegalArgumentException ex) {
System.out.println(ex);
}
}
/** Show the basic usage help in console */
private void showUsageHelp(String unknown) {
System.out.println("Unknown argument: \"" + unknown + "\".");
System.out.println(" Use help, -h for more help.");
}
/** Show the full manual page in the console */
private void showFullHelp() {
System.out.println("Usage: [command] [arguments], see below for options.");
System.out.println("\n command:");
System.out.println(" set, use the twitter Search/REST API.");
System.out.println(" stream, use the twitter Stream API.");
System.out.println("\n arguments:");
System.out.println(" <main>, the information to get from api.twitter.com.");
System.out.println(" <json_member>, any number of arguments for the information");
}
}
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