com.martiansoftware.jsap

Class Switch

java.lang.Object

com.martiansoftware.jsap.Parameter

com.martiansoftware.jsap.Switch

All Implemented Interfaces:

Flagged

public class Switch
extends Parameter
implements Flagged

A Switch is a parameter whose presence alone is significant; another commonly used term for a Switch is "Flag". Switches use a BooleanStringParser internally, so their results can be obtained from a JSAPResult using the getBoolean() methods.

An example of a command line using a Switch is "dosomething -v", where "-v" might mean "verbose."

Author:

Marty Lamb

See Also:

Flagged, BooleanStringParser

Constructor Summary

Constructors

Constructor and Description
Switch(String id) Creates a new Switch with the specified unique ID.
Switch(String id, char shortFlag, String longFlag) A shortcut constructor that creates a new Switch and configures all of its settings.
Switch(String id, char shortFlag, String longFlag, String help) A shortcut constructor that creates a new Switch and configures all of its settings, including help.

Method Summary

Modifier and Type	Method and Description
String	getLongFlag() Returns the long flag for this Switch.
char	getShortFlag() Returns the short flag for this Switch.
Character	getShortFlagCharacter() Returns the short flag for this Switch.
String	getSyntax() Returns usage instructions for this Switch.
protected List	parse(String arg) Creates a new BooleanStringParser to which it delegates the parsing of the specified argument.
Switch	setDefault(String defaultValue) Sets a default value for this parameter.
Switch	setDefault(String[] defaultValues) Sets one or more default values for this parameter.
Switch	setLongFlag(String longFlag) Sets the long flag for this Switch.
Switch	setShortFlag(char shortFlag) Sets the short flag for this Switch.

Methods inherited from class com.martiansoftware.jsap.Parameter

_setDefault, _setDefault, _setUsageName, addDefault, enforceParameterLock, getDefault, getHelp, getID, getUsage, getUsageName, locked, setHelp, setLocked

Methods inherited from class java.lang.Object

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

Constructor Detail

Switch

public Switch(String id)

Creates a new Switch with the specified unique ID.

Parameters:

id - the unique ID for this Switch.

Switch

public Switch(String id,
              char shortFlag,
              String longFlag,
              String help)

A shortcut constructor that creates a new Switch and configures all of its settings, including help.

Parameters:

id - the unique ID for this Switch.

shortFlag - the short flag for this Switch (may be set to JSAP.NO_SHORTFLAG for none).

longFlag - the long flag for this Switch (may be set to JSAP.NO_LONGFLAG for none).

help - the help text for this Switch (may be set to JSAP.NO_HELPfor none).

Switch

public Switch(String id,
              char shortFlag,
              String longFlag)

A shortcut constructor that creates a new Switch and configures all of its settings.

Parameters:

id - the unique ID for this Switch.

shortFlag - the short flag for this Switch (may be set to JSAP.NO_SHORTFLAG for none).

longFlag - the long flag for this Switch (may be set to JSAP.NO_LONGFLAG for none).

Method Detail

setShortFlag

public Switch setShortFlag(char shortFlag)

Sets the short flag for this Switch. To use no short flag at all, set the value to JSAP.NO_SHORTFLAG.

Parameters:

shortFlag - the short flag for this Switch.

Returns:

the modified Switch

getShortFlag

public char getShortFlag()

Returns the short flag for this Switch. If this Switch has no short flag, the return value will be equal to JSAP.NO_SHORTFLAG.

Specified by:

getShortFlag in interface Flagged

Returns:

the short flag for this Switch. If this Switch has no short flag, the return value will be equal to JSAP.NO_SHORTFLAG.

getShortFlagCharacter

public Character getShortFlagCharacter()

Returns the short flag for this Switch. If this Switch has no short flag, the return value will be null.

Specified by:

getShortFlagCharacter in interface Flagged

Returns:

the short flag for this Switch. If this Switch has no short flag, the return value will be null.

setLongFlag

public Switch setLongFlag(String longFlag)

Sets the long flag for this Switch. To use no long flag at all, set the value to JSAP.NO_LONGFLAG.

Parameters:

longFlag - the long flag for this Switch.

Returns:

the modified Switch

getLongFlag

public String getLongFlag()

Returns the long flag for this Switch. If this Switch has no long flag, the return value will be equal to JSAP.NO_LONGFLAG.

Specified by:

getLongFlag in interface Flagged

Returns:

the long flag for this FlaggedOption. If this FlaggedOption has no long flag, the return value will be equal to JSAP.NO_LONGFLAG.

parse

protected List parse(String arg)
              throws ParseException

Creates a new BooleanStringParser to which it delegates the parsing of the specified argument. The result is always a single Boolean.

Specified by:

parse in class Parameter

Parameters:

arg - the argument to parse.

Returns:

an ArrayList containing a single Boolean.

Throws:

ParseException - if the specified parameter cannot be parsed.

getSyntax

public String getSyntax()

Returns usage instructions for this Switch.

Specified by:

getSyntax in class Parameter

Returns:

usage instructions for this Switch based upon its current configuration.

setDefault

public Switch setDefault(String defaultValue)

Sets a default value for this parameter. The default is specified as a String, and is parsed as a single value specified on the command line. In other words, default values for "list" parameters or parameters allowing multiple declarations should be set using setDefault(String[]), as JSAP would otherwise treat the entire list of values as a single value.

Parameters:

defaultValue - the default value for this parameter.

See Also:

setDefault(String)

setDefault

public Switch setDefault(String[] defaultValues)

Sets one or more default values for this parameter. This method should be used whenever a parameter has more than one default value.

Parameters:

defaultValues - the default values for this parameter.

See Also:

setDefault(String)