net.dpml.cli.option
Class Switch

java.lang.Object
  net.dpml.cli.option.OptionImpl
      net.dpml.cli.option.ParentImpl
          net.dpml.cli.option.Switch

All Implemented Interfaces:

Option, Parent

public class Switch
extends ParentImpl

A Parent implementation representing normal switch options. For example: +d|-d or --enable-x|--disable-x.

Version:

1.0.0

Author:

Digital Product Meta Library

Field Summary

static String	DEFAULT_DISABLED_PREFIX The default prefix for disabled switches
static String	DEFAULT_ENABLED_PREFIX The default prefix for enabled switches
static ResourceHelper	RESOURCES i18n

Constructor Summary

Switch(String enabledPrefix, String disabledPrefix, String preferredName, Set aliases, String description, boolean required, Argument argument, Group children, int id, Boolean switchDefault)
Creates a new Switch with the specified parameters

Method Summary

void	appendUsage(StringBuffer buffer, Set helpSettings, Comparator comp) Appends usage information to the specified StringBuffer
void	defaults(WriteableCommandLine commandLine) Adds defaults to a CommandLine.
String	getPreferredName() The preferred name of an option is used for generating help and usage information.
Set	getPrefixes() Identifies the argument prefixes that should be considered options.
Set	getTriggers() Identifies the argument prefixes that should trigger this option.
void	processParent(WriteableCommandLine commandLine, ListIterator arguments) Processes the parent part of the Option.
void	validate(WriteableCommandLine commandLine) Checks that the supplied CommandLine is valid with respect to this option.

Methods inherited from class net.dpml.cli.option.ParentImpl

canProcess, findOption, getArgument, getChildren, getDescription, helpLines, process

Methods inherited from class net.dpml.cli.option.OptionImpl

canProcess, checkPrefixes, equals, getId, hashCode, isRequired, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.dpml.cli.Option

canProcess, getId, isRequired

Field Detail

RESOURCES

public static final ResourceHelper RESOURCES

i18n

DEFAULT_ENABLED_PREFIX

public static final String DEFAULT_ENABLED_PREFIX

The default prefix for enabled switches

See Also:

Constant Field Values

DEFAULT_DISABLED_PREFIX

public static final String DEFAULT_DISABLED_PREFIX

The default prefix for disabled switches

See Also:

Constant Field Values

Constructor Detail

Switch

public Switch(String enabledPrefix,
              String disabledPrefix,
              String preferredName,
              Set aliases,
              String description,
              boolean required,
              Argument argument,
              Group children,
              int id,
              Boolean switchDefault)
       throws IllegalArgumentException

Creates a new Switch with the specified parameters

Parameters:

enabledPrefix - the prefix used for enabled switches

disabledPrefix - the prefix used for disabled switches

preferredName - the preferred name of the switch

aliases - the aliases by which the Switch is known

description - a description of the Switch

required - whether the Option is strictly required

argument - the Argument belonging to this Parent, or null

children - the Group children belonging to this Parent, ot null

id - the unique identifier for this Option

switchDefault - the switch default value

Throws:

IllegalArgumentException - if the preferredName or an alias isn't prefixed with enabledPrefix or disabledPrefix

Method Detail

processParent

public void processParent(WriteableCommandLine commandLine,
                          ListIterator arguments)
                   throws OptionException

Processes the parent part of the Option. The combination of parent, argument and children is handled by the process method.

Parameters:

commandLine - the CommandLine to write results to

arguments - a ListIterator over argument strings positioned at the next argument to process

Throws:

OptionException - if an error occurs while processing

See Also:

Option.process(WriteableCommandLine, ListIterator)

getTriggers

public Set getTriggers()

Identifies the argument prefixes that should trigger this option. This is used to decide which of many Options should be tried when processing a given argument string. The returned Set must not be null.

Returns:

The set of triggers for this Option

getPrefixes

public Set getPrefixes()

Identifies the argument prefixes that should be considered options. This is used to identify whether a given string looks like an option or an argument value. Typically an option would return the set [--,-] while switches might offer [-,+]. The returned Set must not be null.

Specified by:

getPrefixes in interface Option

Overrides:

getPrefixes in class ParentImpl

Returns:

The set of prefixes for this Option

validate

public void validate(WriteableCommandLine commandLine)
              throws OptionException

Checks that the supplied CommandLine is valid with respect to this option.

Specified by:

validate in interface Option

Overrides:

validate in class ParentImpl

Parameters:

commandLine - the CommandLine to check.

Throws:

OptionException - if the CommandLine is not valid.

appendUsage

public void appendUsage(StringBuffer buffer,
                        Set helpSettings,
                        Comparator comp)

Appends usage information to the specified StringBuffer

Specified by:

appendUsage in interface Option

Overrides:

appendUsage in class ParentImpl

Parameters:

buffer - the buffer to append to

helpSettings - a set of display settings @see DisplaySetting

comp - a comparator used to sort the Options

getPreferredName

public String getPreferredName()

The preferred name of an option is used for generating help and usage information.

Returns:

The preferred name of the option

defaults

public void defaults(WriteableCommandLine commandLine)

Adds defaults to a CommandLine. Any defaults for this option are applied as well as the defaults for any contained options

Specified by:

defaults in interface Option

Overrides:

defaults in class ParentImpl

Parameters:

commandLine - the CommandLine object to store defaults in