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EventSetDescriptor (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, 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)           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)           Creates an EventSetDescriptor from scratch using string names.
EventSetDescriptor(Class<?> sourceClass, String eventSetName, Class<?> listenerType, String[] listenerMethodNames, String addListenerMethodName, String removeListenerMethodName, String getListenerMethodName)           This constructor creates an EventSetDescriptor from scratch using string names.
EventSetDescriptor(String eventSetName, Class<?> listenerType, Method[] listenerMethods, Method addListenerMethod, Method removeListenerMethod)           Creates an EventSetDescriptor from scratch using java.lang.reflect.Method and java.lang.Class objects.
EventSetDescriptor(String eventSetName, Class<?> listenerType, Method[] listenerMethods, Method addListenerMethod, Method removeListenerMethod, Method getListenerMethod)           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)           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.
Method	getGetListenerMethod()           Gets the method used to access the registered 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()           Reports if an event set is in the "default" set.
boolean	isUnicast()           Normally event sources are multicast.
void	setInDefaultEventSet(boolean inDefaultEventSet)           Marks 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

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

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(Class<?> sourceClass,
                          String eventSetName,
                          Class<?> listenerType,
                          String[] listenerMethodNames,
                          String addListenerMethodName,
                          String removeListenerMethodName,
                          String getListenerMethodName)
                   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.

getListenerMethodName - The method on the event source that can be used to access the array of event listener objects.

Throws:

IntrospectionException - if an exception occurs during introspection.

Since:

1.4

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EventSetDescriptor

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

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,
                          Method[] listenerMethods,
                          Method addListenerMethod,
                          Method removeListenerMethod,
                          Method getListenerMethod)
                   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.

getListenerMethod - The method on the event source that can be used to access the array of event listener objects.

Throws:

IntrospectionException - if an exception occurs during introspection.

Since:

1.4

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EventSetDescriptor

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

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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getGetListenerMethod

public Method getGetListenerMethod()

Gets the method used to access the registered event listeners.

Returns:

The method used to access the array of listeners at the event source or null if it doesn't exist.

Since:

1.4

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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)

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

Parameters:

inDefaultEventSet - true if the event set is in the "default" set, false if not

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isInDefaultEventSet

public boolean isInDefaultEventSet()

Reports 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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