MorphAbstracting the Underlying Multiple Operating System Architecture for Comprehensive Command Line Graphical Interface

Objectives Bridge the gap for

new users

Create a more user friendly environment with the Command Line feel

Dynamic program that fits the user’s needs

Design

GUI Interface

Data StorageData about functions are stored in an XML

file.Additional functions can be added as they are

needed.Follows a standard format so Linux &

Windows commands can easily be swapped and the same parser can be used.

XML allows for commands to easily be added and removed (not hardcoded).

Data StorageThis is what our XML syntax is:

<category name="Terminal Management"> <command name="man"> <phrase>view help pages</phrase> <summary>This command is used to view help pages for...</summary> <commonparameters>Common parameters for this command include... </commonparameters> <synopsis>man [-acdfFhkKtwW] [--path] [-m system] [-p string]...</synopsis> <description>man formats and displays the on-line manual pages. If...</description> <parameters> <parameter name="-C config_file">Specify the configuration file ...</parameter> <parameter name="-M path">Specify the list of directories to...</parameter> </parameters> <examples> <example name="man ls">displays the manpage for the ls command</example> <example name="man -f ping">displays very short description of what...</example> </examples> </command></category name>

ParserThe parser is the part of the project that

takes the data from the XML and makes it available to the calling class.

It is agnostic to whether the XML is for Linux or Windows. It simply takes the file as a parameter and parses it.

It provides the parsed data as a series of get() methods. There are no set() methods.

ParserThe parser generates a DOM (Document-

Object Model) tree from the XML document.This tree is then parsed and the data from the tree is placed into a hash-table

The hash-table structure allows very quick O(1) access time for the data.

All the work is done on instantiation.

TestingTesting was crucial to make sure that

everything worked. Several interacting parts

Run with or without SSH Run on Linux/Windows/MacProper DropdownsHelp textParserXML Files

Research and Operating System PrinciplesProcess Builder• allows for execution of system processes• similar to concepts of Process Creation in

Chapter 3 of our textbook• ProcessBuilder.start() fork• ProcessBuilder.waitFor() join

Research and Operating System Principles

Threads• used to isolate the execution of the thread so

the main GUI remained responsive (avoids complexity of thread synchronization)

• two ways to implement threads in Java• implement the Runnable interface• extend the Thread class

Research and Operating System Principles

Threads• override run() method with code wanted to

be run separately as a thread• start a thread by simply calling the

Thread.start() method.

Research and Operating System Principles

Networking ClassSends commands directly to a server

bypassing third party programs such as Putty or Chameleon

Application receives output sent from server and displays it in the command prompt window.

Networking Class

Networking ClassModification of the open source terminal

emulator JCTerm by Jcraft.Licensed under GNU LGPL License (allows use

of library in proprietary programs, either open or closed source)

JC Term is in turn based on the JSch SSH client, also by JcraftLicensed under BSD License (same restrictions

as LGPL, BSD code used in Mac OS X)

Networking ClassFeatures of JCTerm

Local/Remote Port ForwardingSFTP SupportSSH2 Protocol SupportPack Compression SupportAnti-Aliasing (set to disabled for Morph)

Interfacing with Command LineIf not using the networking class, the

command is executed using on the user’s local operating system using the ProcessBuilder class.

Since different tasks are independent and isolated processes, an additional command will be needed to get the current working directory.

Works on any operating systems, but the syntax is obviously different

Interfacing with Command LineWindows

Commands must be preceded by “cmd /c”This especially calls the Windows command

interpreter with the /c switch indicating to execute the command and then exit

Example: “cmd /c dir” command to list contents of current directory

To get current directory, append command with “ & cd” (ex: “cmd /c cd .. & cd”)

Interfacing with Command LineLinux

Commands must be preceded by “/bin/bash -c”This especially passes the Linux command to

the bash shell which then executes the command

Example: “/bin/bash -c ls” command to list contents of current directory

To get current directory, append command with “;pwd” (ex: “/bin/bash cd ..;pwd”)

CommandsLinux Windows clear cp ls mv mkdir rm ps top kill cd Compilation commands (javac, g++, gcc) Execute commands (java, gdb, a.out) man grep locate lpr exit ping ifconfig vi

cls copy xcopy dir move mkdir rmdir del tasklist taskkill cd javac java help find findstr print exit ping ipconfig rename

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December 2, 2010, from http://www.java-tips.org/java-se-tips/java.util/from-runtime.exec-to-processbuilder.html

How to read XML file in Java. (n.d.). Java Tips - Home. Retrieved December 2, 2010, from http://www.java-tips.org/java-se-tips/javax.xml.parsers/how-to-read-xml-file-in-java.html

Img source: http://www3.ntu.edu.sg/home/ehchua/programming/java/J6d_xml.html

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