Class Ls

java.lang.Object
  |
  +--Command
        |
        +--Ls

public class Ls

extends Command

The Ls class (a subclass of the abstract base class Command) implements the familiar unix command ls, which does the following: for each file that is a directory, ls outputs the contents of the directory; for each file that is an ordinary file, ls outputs its name. This class implements the abstract methods execute and getDescription inherited from the abstract base class Command.

Constructor Summary

Ls()

Method Summary

java.lang.String	execute(java.lang.String args) Executes the ls command and returns the result in the form of a String object.
java.lang.String	getDescription() Returns a description of the command.
java.lang.String	processDirectory(java.lang.String directory) A helper function that appends the contents of the given file to a result String object to be returned by execute.

Methods inherited from class Command

ExpandArgs

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Ls

public Ls()

Method Detail

execute

public java.lang.String execute(java.lang.String args)

Executes the ls command and returns the result in the form of a String object.

Specified by:

execute in class Command

Parameters:

args - arguments for this command.

Returns:

the string result of executing the ls command.

processDirectory

public java.lang.String processDirectory(java.lang.String directory)

A helper function that appends the contents of the given file to a result String object to be returned by execute.

Parameters:

directory - name of directory whose contents will be appended to result string.

Returns:

a string containing contents of directory.

getDescription

public java.lang.String getDescription()

Description copied from class: Command

Returns a description of the command.

Specified by:

getDescription in class Command

Returns:

the name of the command.