Class java.beans.EventSetDescriptor - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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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.

EventSetDescriptor(Class, String, Class, String): 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, String, Class, String[], String, String): This constructor creates an EventSetDescriptor from scratch using string names.
EventSetDescriptor(String, Class, Method[], Method, Method): This constructor creates an EventSetDescriptor from scratch using java.lang.reflect.Method and java.lang.Class objects.
EventSetDescriptor(String, Class, MethodDescriptor[], Method, Method): This constructor creates an EventSetDescriptor from scratch using java.lang.reflect.MethodDescriptor and java.lang.Class objects.

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

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.

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 register 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".

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