cd command

/*
 * Copyright © 2015 Jacob Keep (Jnk1296). All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 *  * Neither the name of JuNK Software nor the names of its contributors may
 *   be used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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package net.risenphoenix.filebrowser.client.commands;

import net.risenphoenix.filebrowser.network.PacketSender;
import net.risenphoenix.filebrowser.packet.Packet;
import net.risenphoenix.filebrowser.packet.PacketType;

import java.io.File;
import java.util.ArrayList;
import java.util.Random;

public class CmdChangeDir extends Command {

    public CmdChangeDir(CommandInterpreter interpreter,
                        String[] callArgs, CommandType type) {
        super(interpreter, callArgs, type);
        setHelp("Change Directory");
        setHelp("Changes your current operating directory. Arguments \n" +
                "accepted are either a case sensitive file name (for Unix \n" +
                "support) or the UP operator \"..\".");
        setSyntax("cd <dir_name || .. || .>");
    }

    @Override
    public void onExecute(String[] args) {
        StringBuilder sb = new StringBuilder();
        String directoryName;

        for (int i = 1; i < args.length; i++) {
            sb.append(args[i] + " ");
        }

        directoryName = sb.toString().substring(0, sb.toString().length() - 1);

        Object[] data = (Object[])getInterpreter().getDirectoryManager().getPacket().getData();
        ArrayList<File> fileListing = (ArrayList<File>)data[1];

        File currentDir = getInterpreter().getDirectoryManager().getCurrentDirectory();

        if(directoryName.equals("..")) {
            String dir = currentDir.getPath();
            int endIndex = dir.lastIndexOf("/");
            if (endIndex != -1) {
                String newDir = dir.substring(0, endIndex);
                if (newDir.length() >= getInterpreter().getDirectoryManager()
                        .getRootDirectory().getPath().length()) {
                    requestDirectoryUpdate(newDir);
                    return;
                } else if (currentDir.getPath().equals(getInterpreter()
                        .getDirectoryManager().getRootDirectory().getPath())) {
                    System.out.println("Unable to go higher.");
                    return;
                } else {
                    requestDirectoryUpdate(getInterpreter()
                            .getDirectoryManager().getRootDirectory()
                            .getPath());
                    return;
                }
            } else {
                System.out.println("Unable to go higher.");
            }
        } else if (directoryName.equals(".")) {
            String dir = getInterpreter().getDirectoryManager()
                    .getRootDirectory().getPath();
            requestDirectoryUpdate(dir);
            return;
        } else {
            for(File f:fileListing) {
                if (f.getName().equals(directoryName)) {
                    if (f.isDirectory()) {
                        // All clear, request Directory Update
                        String path = f.getPath();
                        requestDirectoryUpdate(path);
                        return;
                    } else {
                        System.out.println("The requested object is not a directory.");
                        return;
                    }
                }
            }
        }

        System.out.println("The directory requested does not exist.");
    }

    private void requestDirectoryUpdate(String directory) {
        int transactionID = new Random().nextInt();
        File newDirectory = new File(directory);

        Packet p = new Packet(PacketType.REQUEST_DIRECTORY_LISTING,
                new Object[]{newDirectory, transactionID});
        PacketSender ps = new PacketSender(getInterpreter().getClient()
                .getRemoteNetworkInfo(), p);
        ps.start();

        while(true) {
            if (getInterpreter().getDirectoryManager().getTransactionID()
                    .equals(transactionID)) {
                return;
            }
        }
    }
}