net.dpml.cli.option
Class GroupImpl

java.lang.Object
  net.dpml.cli.option.OptionImpl
      net.dpml.cli.option.GroupImpl

All Implemented Interfaces:

Group, Option

public class GroupImpl
extends OptionImpl
implements Group

An implementation of Group

Version:

1.0.0

Author:

Digital Product Meta Library

Constructor Summary

GroupImpl(List options, String name, String description, int minimum, int maximum)
Creates a new GroupImpl using the specified parameters.

Method Summary

void	appendUsage(StringBuffer buffer, Set helpSettings, Comparator comp) Appends usage information to the specified StringBuffer
void	appendUsage(StringBuffer buffer, Set helpSettings, Comparator comp, String separator) Appends usage information to the specified StringBuffer
boolean	canProcess(WriteableCommandLine commandLine, String arg) Indicates whether this Option will be able to process the particular argument.
void	defaults(WriteableCommandLine commandLine) Process defaults.
Option	findOption(String trigger) Recursively searches for an option with the supplied trigger.
List	getAnonymous() Gets the m_anonymous Arguments of this Group.
String	getDescription() Returns a description of the option.
int	getMaximum() Retrieves the maximum number of values acceptable for a valid Argument
int	getMinimum() Retrieves the minimum number of values required for a valid Argument
List	getOptions() Gets the member Options of thie Group.
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.
List	helpLines(int depth, Set helpSettings, Comparator comp) Builds up a list of HelpLineImpl instances to be presented by HelpFormatter.
boolean	isRequired() Indicates whether argument values must be present for the CommandLine to be valid.
void	process(WriteableCommandLine commandLine, ListIterator arguments) Processes String arguments into a CommandLine.
void	validate(WriteableCommandLine commandLine) Checks that the supplied CommandLine is valid with respect to this option.

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

canProcess, checkPrefixes, equals, getId, hashCode, 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

Constructor Detail

GroupImpl

public GroupImpl(List options,
                 String name,
                 String description,
                 int minimum,
                 int maximum)

Creates a new GroupImpl using the specified parameters.

Parameters:

options - the Options and Arguments that make up the Group

name - the name of this Group, or null

description - a description of this Group

minimum - the minimum number of Options for a valid CommandLine

maximum - the maximum number of Options for a valid CommandLine

Method Detail

canProcess

public boolean canProcess(WriteableCommandLine commandLine,
                          String arg)

Indicates whether this Option will be able to process the particular argument.

Specified by:

canProcess in interface Option

Parameters:

commandLine - the CommandLine object to store defaults in

arg - the argument to be tested

Returns:

true if the argument can be processed by 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

Returns:

The set of prefixes for this Option

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.

Specified by:

getTriggers in interface Option

Returns:

The set of triggers for this Option

process

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

Processes String arguments into a CommandLine. The iterator will initially point at the first argument to be processed and at the end of the method should point to the first argument not processed. This method MUST process at least one argument from the ListIterator.

Specified by:

process in interface Option

Parameters:

commandLine - the CommandLine object to store results in

arguments - the arguments to process

Throws:

OptionException - if any problems occur

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

Parameters:

commandLine - the CommandLine to check.

Throws:

OptionException - if the CommandLine is not valid.

getPreferredName

public String getPreferredName()

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

Specified by:

getPreferredName in interface Option

Returns:

The preferred name of the option

getDescription

public String getDescription()

Returns a description of the option. This string is used to build help messages as in the HelpFormatter.

Specified by:

getDescription in interface Option

Returns:

a description of the option.

See Also:

HelpFormatter

appendUsage

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

Appends usage information to the specified StringBuffer

Specified by:

appendUsage in interface Option

Parameters:

buffer - the buffer to append to

helpSettings - a set of display settings @see DisplaySetting

comp - a comparator used to sort the Options

appendUsage

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

Appends usage information to the specified StringBuffer

Specified by:

appendUsage in interface Group

Parameters:

buffer - the buffer to append to

helpSettings - a set of display settings @see DisplaySetting

comp - a comparator used to sort the Options

separator - the String used to separate member Options

helpLines

public List helpLines(int depth,
                      Set helpSettings,
                      Comparator comp)

Builds up a list of HelpLineImpl instances to be presented by HelpFormatter.

Specified by:

helpLines in interface Option

Parameters:

depth - the initial indent depth

helpSettings - the HelpSettings that should be applied

comp - a comparator used to sort options when applicable.

Returns:

a List of HelpLineImpl objects

See Also:

HelpLine, HelpFormatter

getOptions

public List getOptions()

Gets the member Options of thie Group. Note this does not include any Arguments

Returns:

only the non Argument Options of the Group

getAnonymous

public List getAnonymous()

Gets the m_anonymous Arguments of this Group.

Returns:

the Argument options of this Group

findOption

public Option findOption(String trigger)

Recursively searches for an option with the supplied trigger.

Specified by:

findOption in interface Option

Overrides:

findOption in class OptionImpl

Parameters:

trigger - the trigger to search for.

Returns:

the matching option or null.

getMinimum

public int getMinimum()

Retrieves the minimum number of values required for a valid Argument

Specified by:

getMinimum in interface Group

Returns:

the minimum number of values

getMaximum

public int getMaximum()

Retrieves the maximum number of values acceptable for a valid Argument

Specified by:

getMaximum in interface Group

Returns:

the maximum number of values

isRequired

public boolean isRequired()

Indicates whether argument values must be present for the CommandLine to be valid.

Specified by:

isRequired in interface Group

Specified by:

isRequired in interface Option

Overrides:

isRequired in class OptionImpl

Returns:

true iff the CommandLine will be invalid without at least one value

See Also:

getMinimum(), getMaximum()

defaults

public void defaults(WriteableCommandLine commandLine)

Process defaults.

Specified by:

defaults in interface Option

Overrides:

defaults in class OptionImpl

Parameters:

commandLine - the commandline