Browser.java

package hw3;

import java.awt.Desktop;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class Browser {
        private static  final Pattern urlPat = Pattern.compile("new (?<url>[a-zA-Z0-9./~]+[a-zA-Z0-9/]+)");
        private static  final Pattern deletePat = Pattern.compile("close (?<num>[0-9]+)");
        private static  final Pattern dispPat = Pattern.compile("display (?<num>[0-9]+)");
        private static  final Pattern movePat = Pattern.compile("move (?<from>[0-9]+) (?<to>[0-9]+)");
        private static  final Pattern closePat = Pattern.compile("close (?<num>[0-9]+)");
                private static final Pattern replacePat = Pattern.compile("navigate (?<num>[0-9]+) (?<url>[a-zA-Z0-9./~]+[a-zA-Z0-9/]+)");

        public static void main(String[] args) throws IOException, URISyntaxException{
            List tabs = new LinkedList();

            while (true){
                    System.out.println("new <url> / close <num> / display <num> / move <from> <to> / navigate <num> <url> / count / exit");
                    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
                    String cmd = in.readLine();
                    cmd = cmd.trim();

                    Matcher urlMat = urlPat.matcher(cmd);
                    Matcher deleteMat = deletePat.matcher(cmd);
                    Matcher dispMat = dispPat.matcher(cmd);
                    Matcher swapMat = movePat.matcher(cmd);
                    Matcher closeMat = closePat.matcher(cmd);
                                        Matcher replaceMat = replacePat.matcher(cmd);
                    if (urlMat.matches()) {
                            tabs.add(new Tab(urlMat.group("url")));
                    } else if (deleteMat.matches()) {
                            tabs.remove(Integer.parseInt(deleteMat.group("num")));
                    } else if (dispMat.matches()) {
                            Desktop.getDesktop().browse(new URI(((Tab)tabs.get(Integer.parseInt(dispMat.group("num")))).url));
                    } else if (swapMat.matches()) {
                            int from = Integer.parseInt(swapMat.group("from"));
                            int to = Integer.parseInt(swapMat.group("to"));
                            tabs.move(from, to);
                    } else if (replaceMat.matches()){
                                                        tabs.replace(Integer.parseInt(replaceMat.group("num")), new Tab(replaceMat.group("url")));
                                        } else if(cmd.equals("count")) {
                                                int tabcount = tabs.size();
                                                if (tabcount == 1) {
                                                        System.out.println("You currently have 1 tab open.");
                                                } else {
                                                        System.out.println("You currently have "+tabs.size()+" tabs open.");
                                                }
                    } else if (cmd.equals("exit")){
                                            break;
                                        }else{
                            System.out.println("UNRECOGNIZED COMMAND");
                    }

                    Object[] tabsArr = tabs.toArray();
                    int i = 0;
                    for (Object o : tabsArr) {
                            Tab t = (Tab) o;
                            System.out.print("|"+i+" "+t.title+" |");
                            System.out.print(" ");
                            i++;
                    }
                    System.out.println();
            }
        }

}