org.crsh.shell.impl.command.system
Class SystemResolver

java.lang.Object
  org.crsh.shell.impl.command.system.SystemResolver

All Implemented Interfaces:

CommandResolver

public class SystemResolver
extends Object
implements CommandResolver

Author:

Julien Viet

Field Summary

private static HashMap<String,Class<? extends BaseCommand>>	commands .
private static HashMap<String,String>	descriptions .
static SystemResolver	INSTANCE .

Constructor Summary

private

SystemResolver()

Method Summary

private <C extends BaseCommand> CommandResolution	createCommand(Class<C> commandClass)
Iterable<Map.Entry<String,String>>	getDescriptions()
Command<?>	resolveCommand(String name) Attempt to obtain a command.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final SystemResolver INSTANCE

.

commands

private static final HashMap<String,Class<? extends BaseCommand>> commands

.

descriptions

private static final HashMap<String,String> descriptions

.

Constructor Detail

SystemResolver

private SystemResolver()

Method Detail

getDescriptions

public Iterable<Map.Entry<String,String>> getDescriptions()

Specified by:

getDescriptions in interface CommandResolver

Returns:

the known command names by this resolver, the returned map keys are the command names and the values are the corresponding one line description of the command

resolveCommand

public Command<?> resolveCommand(String name)
                          throws CommandException,
                                 NullPointerException

Description copied from interface: CommandResolver

Attempt to obtain a command. Null is returned when such command does not exist.

Specified by:

resolveCommand in interface CommandResolver

Parameters:

name - the command name

Returns:

the command shell

Throws:

CommandException - if an error occured preventing the command creation

NullPointerException - if the name argument is null

createCommand

private <C extends BaseCommand> CommandResolution createCommand(Class<C> commandClass)
                                 throws CommandException

Throws:

CommandException