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Java Platform 1.2
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Class java.beans.EventSetDescriptor

java.lang.Object
  |
  +--java.beans.FeatureDescriptor
        |
        +--java.beans.EventSetDescriptor

public class EventSetDescriptor

extends FeatureDescriptor

An EventSetDescriptor describes a group of events that a given Java bean fires.

The given group of events are all delivered as method calls on a single event listener interface, and an event listener object can be registered via a call on a registration method supplied by the event source.

Constructor Summary

EventSetDescriptor(Class sourceClass, String eventSetName, Class listenerType, String listenerMethodName)
This constructor creates an EventSetDescriptor assuming that you are following the most simple standard design pattern where a named event "fred" is (1) delivered as a call on the single method of interface FredListener, (2) has a single argument of type FredEvent, and (3) where the FredListener may be registered with a call on an addFredListener method of the source component and removed with a call on a removeFredListener method.

EventSetDescriptor(Class sourceClass, String eventSetName, Class listenerType, String[] listenerMethodNames, String addListenerMethodName, String removeListenerMethodName)
This constructor creates an EventSetDescriptor from scratch using string names.

EventSetDescriptor(String eventSetName, Class listenerType, Method[] listenerMethods, Method addListenerMethod, Method removeListenerMethod)
This constructor creates an EventSetDescriptor from scratch using java.lang.reflect.

EventSetDescriptor(String eventSetName, Class listenerType, MethodDescriptor[] listenerMethodDescriptors, Method addListenerMethod, Method removeListenerMethod)
This constructor creates an EventSetDescriptor from scratch using java.lang.reflect.

Method Summary

Method	getAddListenerMethod()
MethodDescriptor[]	getListenerMethodDescriptors()
Method[]	getListenerMethods()
Class	getListenerType()
Method	getRemoveListenerMethod()
boolean	isInDefaultEventSet() Report if an event set is in the "default set".
boolean	isUnicast() Normally event sources are multicast.
void	setInDefaultEventSet(boolean inDefaultEventSet) Mark an event set as being in the "default" set (or not).
void	setUnicast(boolean unicast) Mark an event set as unicast (or not).

Methods inherited from class java.beans.FeatureDescriptor

attributeNames , getDisplayName , getName , getShortDescription , getValue , isExpert , isHidden , isPreferred , setDisplayName , setExpert , setHidden , setName , setPreferred , setShortDescription , setValue

Methods inherited from class java.lang.Object

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

Constructor Detail

EventSetDescriptor

public EventSetDescriptor(Class sourceClass,
                          String eventSetName,
                          Class listenerType,
                          String listenerMethodName)
                   throws IntrospectionException

This constructor creates an EventSetDescriptor assuming that you are following the most simple standard design pattern where a named event "fred" is (1) delivered as a call on the single method of interface FredListener, (2) has a single argument of type FredEvent, and (3) where the FredListener may be registered with a call on an addFredListener method of the source component and removed with a call on a removeFredListener method.

Parameters:

sourceClass - The class firing the event.

eventSetName - The programmatic name of the event. E.g. "fred". Note that this should normally start with a lower-case character.

listenerType - The target interface that events will get delivered to.

listenerMethodName - The method that will get called when the event gets delivered to its target listener interface.

Throws:

IntrospectionException - if an exception occurs during introspection.

EventSetDescriptor

public EventSetDescriptor(Class sourceClass,
                          String eventSetName,
                          Class listenerType,
                          String[] listenerMethodNames,
                          String addListenerMethodName,
                          String removeListenerMethodName)
                   throws IntrospectionException

This constructor creates an EventSetDescriptor from scratch using string names.

Parameters:

sourceClass - The class firing the event.

eventSetName - The programmatic name of the event set. Note that this should normally start with a lower-case character.

listenerType - The Class of the target interface that events will get delivered to.

listenerMethodNames - The names of the methods that will get called when the event gets delivered to its target listener interface.

addListenerMethodName - The name of the method on the event source that can be used to register an event listener object.

removeListenerMethodName - The name of the method on the event source that can be used to de-register an event listener object.

Throws:

IntrospectionException - if an exception occurs during introspection.

EventSetDescriptor

public EventSetDescriptor(String eventSetName,
                          Class listenerType,
                          Method[] listenerMethods,
                          Method addListenerMethod,
                          Method removeListenerMethod)
                   throws IntrospectionException

This constructor creates an EventSetDescriptor from scratch using java.lang.reflect.Method and java.lang.Class objects.

Parameters:

eventSetName - The programmatic name of the event set.

listenerType - The Class for the listener interface.

listenerMethods - An array of Method objects describing each of the event handling methods in the target listener.

addListenerMethod - The method on the event source that can be used to register an event listener object.

removeListenerMethod - The method on the event source that can be used to de-register an event listener object.

Throws:

IntrospectionException - if an exception occurs during introspection.

EventSetDescriptor

public EventSetDescriptor(String eventSetName,
                          Class listenerType,
                          MethodDescriptor[] listenerMethodDescriptors,
                          Method addListenerMethod,
                          Method removeListenerMethod)
                   throws IntrospectionException

This constructor creates an EventSetDescriptor from scratch using java.lang.reflect.MethodDescriptor and java.lang.Class objects.

Parameters:

eventSetName - The programmatic name of the event set.

listenerType - The Class for the listener interface.

listenerMethodDescriptors - An array of MethodDescriptor objects describing each of the event handling methods in the target listener.

addListenerMethod - The method on the event source that can be used to register an event listener object.

removeListenerMethod - The method on the event source that can be used to de-register an event listener object.

Throws:

IntrospectionException - if an exception occurs during introspection.

Method Detail

getListenerType

public Class getListenerType()

Returns:

The Class object for the target interface that will get invoked when the event is fired.

getListenerMethods

public Method[] getListenerMethods()

Returns:

An array of Method objects for the target methods within the target listener interface that will get called when events are fired.

getListenerMethodDescriptors

public MethodDescriptor[] getListenerMethodDescriptors()

Returns:

An array of MethodDescriptor objects for the target methods within the target listener interface that will get called when events are fired.

getAddListenerMethod

public Method getAddListenerMethod()

Returns:

The method used to register a listener at the event source.

getRemoveListenerMethod

public Method getRemoveListenerMethod()

Returns:

The method used to remove a listener at the event source.

setUnicast

public void setUnicast(boolean unicast)

Mark an event set as unicast (or not).

Parameters:

unicast - True if the event set is unicast.

isUnicast

public boolean isUnicast()

Normally event sources are multicast. However there are some exceptions that are strictly unicast.

Returns:

True if the event set is unicast. Defaults to "false".

setInDefaultEventSet

public void setInDefaultEventSet(boolean inDefaultEventSet)

Mark an event set as being in the "default" set (or not). By default this is true.

Parameters:

unicast - True if the event set is unicast.

isInDefaultEventSet

public boolean isInDefaultEventSet()

Report if an event set is in the "default set".

Returns:

True if the event set is in the "default set". Defaults to "true".