net.dpml.cli.option
Class PropertyOption

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

All Implemented Interfaces:

Option

public class PropertyOption
extends OptionImpl

Handles the java style "-Dprop=value" opions

Version:

1.0.0

Author:

Digital Product Meta Library

Field Summary

static String	DEFAULT_DESCRIPTION The default property option description.
static String	DEFAULT_OPTION_STRING The default property option name.
static PropertyOption	INSTANCE A default PropertyOption instance

Constructor Summary

PropertyOption()
Creates a new PropertyOption using the default settings of a "-D" trigger and an id of 'D'

PropertyOption(String optionString, String description, int id)
Creates a new PropertyOption using the specified parameters

Method Summary

void	appendUsage(StringBuffer buffer, Set helpSettings, Comparator comp) Appends usage information to the specified StringBuffer
boolean	canProcess(WriteableCommandLine commandLine, String argument) Indicates whether this Option will be able to process the particular argument.
String	getDescription() Returns a description of the option.
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.
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, defaults, equals, findOption, getId, hashCode, isRequired, toString

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_OPTION_STRING

public static final String DEFAULT_OPTION_STRING

The default property option name.

See Also:

Constant Field Values

DEFAULT_DESCRIPTION

public static final String DEFAULT_DESCRIPTION

The default property option description.

See Also:

Constant Field Values

INSTANCE

public static final PropertyOption INSTANCE

A default PropertyOption instance

Constructor Detail

PropertyOption

public PropertyOption()

Creates a new PropertyOption using the default settings of a "-D" trigger and an id of 'D'

PropertyOption

public PropertyOption(String optionString,
                      String description,
                      int id)

Creates a new PropertyOption using the specified parameters

Parameters:

optionString - the trigger for the Option

description - the description of the Option

id - the id of the Option

Method Detail

canProcess

public boolean canProcess(WriteableCommandLine commandLine,
                          String argument)

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

Parameters:

commandLine - the CommandLine object to store defaults in

argument - 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.

Returns:

The set of prefixes 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.

Parameters:

commandLine - the CommandLine object to store results in

arguments - the arguments to process

Throws:

OptionException - if any problems occur

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

validate

public void validate(WriteableCommandLine commandLine)
              throws OptionException

Checks that the supplied CommandLine is valid with respect to this 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

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

getDescription

public String getDescription()

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

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.

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