de.caff.util.args

Interface Switch

All Superinterfaces:

SwitchOrArgument

All Known Implementing Classes:

AbstractSimpleSwitch, SimpleOnOffSwitch, SimpleSwitch, StringArgSwitch

public interface Switch
extends SwitchOrArgument

A basic command line switch.

A switch can appear in a short one-character form like -k or a long form like --kill-all-idiots. Long forms can have an argument directly append separated by an equals sign (=), or as next command line argument. Short forms only accept the latter.

Since:

January 27, 2019

Author:

Rammi

Method Summary

Modifier and Type	Method and Description
default boolean	consumeArgument(java.lang.String arg) Read further arguments from the command line.
void	found(char shortSwitch) This switch appears in the command line in the given short form.
void	found(java.lang.String longSwitch) This switch appears in the command line in the given long form.
java.util.Collection<java.lang.String>	getLongForms() Get the long forms influencing this switch.
java.util.Collection<java.lang.Character>	getShortForms() Get the short one character forms influencing this switch.
default boolean	isOptional() Is this an optional switch?
default boolean	isSwitch() Is this a switch?
default boolean	needsArguments() Does this switch require arguments?

Methods inherited from interface de.caff.util.args.SwitchOrArgument

getAppearance, getDescription

Method Detail

isSwitch

default boolean isSwitch()

Description copied from interface: SwitchOrArgument

Is this a switch?

Specified by:

isSwitch in interface SwitchOrArgument

Returns:

true: this is a switch and can be casted to Switch, false: this is a argument and can be casted to Argument

getShortForms

@NotNull
java.util.Collection<java.lang.Character> getShortForms()

Get the short one character forms influencing this switch.

If the command line switch is -k, this method should return a singleton collection with the character k.

Returns:

short one character forms, may be empty

getLongForms

@NotNull
java.util.Collection<java.lang.String> getLongForms()

Get the long forms influencing this switch.

The return strings must not include the -- prefix, and have to consist of characters, digits and the minus sign (-.

So if the command line switch is --kill-all-idiots, this method should return a singleton collection with the string kill-all-idiots.

Returns:

long switches. may be empty

isOptional

default boolean isOptional()

Is this an optional switch? Non-optional switches have to appear on the command line. The default implementation returns true.

Specified by:

isOptional in interface SwitchOrArgument

Returns:

true: if this switch is optional
false: if this switch is required

found

void found(char shortSwitch)

This switch appears in the command line in the given short form.

Parameters:

shortSwitch - short form in which this switch appeared

found

void found(@NotNull
           java.lang.String longSwitch)

This switch appears in the command line in the given long form.

Parameters:

longSwitch - long form

needsArguments

default boolean needsArguments()

Does this switch require arguments? Only if it requires arguments, the consumeArgument(String) method will be called. The default implementation returns false, so always both this method and the consumeArgument(String) method need to be overridden.

Returns:

true if this switch requires arguments
false if this switch does not require arguments

See Also:

consumeArgument(String)

consumeArgument

default boolean consumeArgument(@NotNull
                                java.lang.String arg)

Read further arguments from the command line.

Specified by:

consumeArgument in interface SwitchOrArgument

Parameters:

arg - argument

Returns:

if more arguments may be consumed

See Also:

needsArguments()