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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class EventSetDescriptor - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.beans
Class EventSetDescriptor

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

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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.

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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.Method and java.lang.Class objects.

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

 

Method Summary
Method	getAddListenerMethod()           Gets the method used to add event listeners.
MethodDescriptor[]	getListenerMethodDescriptors()           Gets the MethodDescriptors of the target listener interface.
Method[]	getListenerMethods()           Gets the methods of the target listener interface.
Class	getListenerType()           Gets the Class object for the target interface.
Method	getRemoveListenerMethod()           Gets the method used to remove event listeners.
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.

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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.

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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.

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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()

Gets the Class object for the target interface.

Returns:

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

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getListenerMethods

public Method[] getListenerMethods()

Gets the methods of the target listener interface.

Returns:

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

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getListenerMethodDescriptors

public MethodDescriptor[] getListenerMethodDescriptors()

Gets the MethodDescriptors of the target listener interface.

Returns:

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

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getAddListenerMethod

public Method getAddListenerMethod()

Gets the method used to add event listeners.

Returns:

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

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getRemoveListenerMethod

public Method getRemoveListenerMethod()

Gets the method used to remove event listeners.

Returns:

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

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setUnicast

public void setUnicast(boolean unicast)

Mark an event set as unicast (or not).

Parameters:

unicast - True if the event set is unicast.

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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".

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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.

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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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