net.dpml.cli.option
Class ParentImpl

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

All Implemented Interfaces:

Option, Parent

Direct Known Subclasses:

Command, DefaultOption, Switch

public abstract class ParentImpl
extends OptionImpl
implements Parent

A base implementation of Parent providing limited ground work for further Parent implementations.

Version:

1.0.0

Author:

Digital Product Meta Library

Constructor Summary

protected

ParentImpl(Argument argument, Group children, String description, int id, boolean required) Creation of a new ParaentImpl.

Method Summary

void	appendUsage(StringBuffer buffer, Set helpSettings, Comparator comp) 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) Adds defaults to a CommandLine.
Option	findOption(String trigger) Recursively searches for an option with the supplied trigger.
Argument	getArgument() Return the argument value if any.
Group	getChildren() Return any children.
String	getDescription() Returns a description of the option.
Set	getPrefixes() Identifies the argument prefixes that should be considered options.
List	helpLines(int depth, Set helpSettings, Comparator comp) Builds up a list of HelpLineImpl instances to be presented by HelpFormatter.
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, isRequired, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.dpml.cli.Parent

processParent

Methods inherited from interface net.dpml.cli.Option

canProcess, getId, getPreferredName, getTriggers, isRequired

Constructor Detail

ParentImpl

protected ParentImpl(Argument argument,
                     Group children,
                     String description,
                     int id,
                     boolean required)

Creation of a new ParaentImpl.

Parameters:

argument - an argument

children - the children

description - the description

id - the id

required - the required flag

Method Detail

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

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

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.

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

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

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

getArgument

public Argument getArgument()

Return the argument value if any.

Returns:

Returns the argument.

getChildren

public Group getChildren()

Return any children.

Returns:

Returns the children.

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.

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 OptionImpl

Parameters:

commandLine - the CommandLine object to store defaults in