Class ShellCommand

java.lang.Object
  ShellCommand

Direct Known Subclasses:

HelpCommand, MkdirCommand, NewfileCommand, TypeCommand

public abstract class ShellCommand

extends Object

Model those features common to all ShellCommands. Each concrete extension of this class provides a constructor and an implementation for method doIt.

Version:

6

Constructor Summary

protected	ShellCommand(String helpString) A constructor for commands having no arguments.
protected	ShellCommand(String helpString, String argString) A constructor, always called (as super()) by the subclass.

Method Summary

abstract void	doIt(StringTokenizer args, Shell sh) Execute the command.
String	getArgString() The argument string prototype.
String	getHelpString() Help for this command.

Methods inherited from class java.lang.Object

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

Constructor Detail

ShellCommand

protected ShellCommand(String helpString)

A constructor for commands having no arguments.

Parameters:

helpString - a brief description of what the command does.

ShellCommand

protected ShellCommand(String helpString,
                       String argString)

A constructor, always called (as super()) by the subclass. Used only for commands that have arguments.

Parameters:

helpString - a brief description of what the command does.

argString - a prototype illustrating the required arguments.

Method Detail

doIt

public abstract void doIt(StringTokenizer args,
                          Shell sh)

Execute the command.

Parameters:

args - the remainder of the command line.

sh - the current shell

getArgString

public String getArgString()

The argument string prototype.

Returns:

the argument string prototype.

getHelpString

public String getHelpString()

Help for this command.

Returns:

the help string.