Package org.kohsuke.args4j

Class OptionHandlerRegistry

java.lang.Object

org.kohsuke.args4j.OptionHandlerRegistry

public class OptionHandlerRegistry
extends Object

Manages the registration of option handlers. This is good for registering custom handlers for specific parameter classes not yet implemented. The registry is a singleton that can be retrieved with the getRegistry() call.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private class	OptionHandlerRegistry.DefaultConstructorHandlerFactory
static interface	OptionHandlerRegistry.OptionHandlerFactory	Provide custom logic for creating OptionHandler implementation.

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<Class,OptionHandlerRegistry.OptionHandlerFactory>	handlers	All OptionHandlers known to the CmdLineParser.
private static OptionHandlerRegistry	instance	The shared reference.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	OptionHandlerRegistry()	Constructs an option handler manager with the default handlers initialized.

Method Summary

Modifier and Type	Method	Description
protected OptionHandler	createOptionHandler(CmdLineParser parser, OptionDef o, Setter setter)	Creates an OptionHandler that handles the given Option annotation and the Setter instance.
private static Constructor<? extends OptionHandler>	getConstructor(Class<? extends OptionHandler> handlerClass)	Finds the constructor for an option handler.
static OptionHandlerRegistry	getRegistry()	Gets the option handler registry singleton instance.
private void	initHandlers()	Registers the default handlers.
void	registerHandler(Class valueType, Class<? extends OptionHandler> handlerClass)	Registers a user-defined OptionHandler class with args4j.
void	registerHandler(Class valueType, OptionHandlerRegistry.OptionHandlerFactory factory)	Registers a user-defined OptionHandler class with args4j.

Methods inherited from class java.lang.Object

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

Field Details

instance

private static OptionHandlerRegistry instance

The shared reference.

See Also:

• getRegistry()

handlers

private final Map<Class,OptionHandlerRegistry.OptionHandlerFactory> handlers

All OptionHandlers known to the CmdLineParser. Constructors of OptionHandler-derived class keyed by their supported types.

Constructor Details

OptionHandlerRegistry

private OptionHandlerRegistry()

Constructs an option handler manager with the default handlers initialized.

Method Details

getRegistry

public static OptionHandlerRegistry getRegistry()

Gets the option handler registry singleton instance.

Returns:

a shared instance of the registry.

initHandlers

private void initHandlers()

Registers the default handlers.

getConstructor

private static Constructor<? extends OptionHandler> getConstructor(Class<? extends OptionHandler> handlerClass)

Finds the constructor for an option handler.

registerHandler

public void registerHandler(Class valueType,
 Class<? extends OptionHandler> handlerClass)

Registers a user-defined OptionHandler class with args4j.

This method allows users to extend the behavior of args4j by writing their own OptionHandler implementation.

Parameters:

valueType - The specified handler is used when the field/method annotated by Option is of this type.

handlerClass - This class must have the constructor that has the same signature as OptionHandler(CmdLineParser, OptionDef, Setter)

Throws:

NullPointerException - if valueType or handlerClass is null.

IllegalArgumentException - if handlerClass is not a subtype of OptionHandler.

registerHandler

public void registerHandler(Class valueType,
 OptionHandlerRegistry.OptionHandlerFactory factory)

Registers a user-defined OptionHandler class with args4j.

This method allows users to extend the behavior of args4j by writing their own OptionHandler implementation.

Parameters:

valueType - The specified handler is used when the field/method annotated by Option is of this type.

factory - Factory to instantiate handler upon request.

Throws:

NullPointerException - if valueType or factory is null.

createOptionHandler

protected OptionHandler createOptionHandler(CmdLineParser parser,
 OptionDef o,
 Setter setter)

Creates an OptionHandler that handles the given Option annotation and the Setter instance.