SimpleBeanInfo (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Ed. 5.0

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java.beans
Class SimpleBeanInfo

java.lang.Object
  java.beans.SimpleBeanInfo

All Implemented Interfaces:: BeanInfo

public class SimpleBeanInfo
extends Object
implements BeanInfo
extends Object
implements BeanInfo

This is a support class to make it easier for people to provide BeanInfo classes.

It defaults to providing "noop" information, and can be selectively overriden to provide more explicit information on chosen topics. When the introspector sees the "noop" values, it will apply low level introspection and design patterns to automatically analyze the target bean.

Field Summary

Fields inherited from interface java.beans.BeanInfo

ICON_COLOR_16x16, ICON_COLOR_32x32, ICON_MONO_16x16, ICON_MONO_32x32

Constructor Summary

SimpleBeanInfo()


Method Summary

BeanInfo[] getAdditionalBeanInfo()
          Claim there are no other relevant BeanInfo objects.

BeanDescriptor getBeanDescriptor()
          Deny knowledge about the class and customizer of the bean.

int getDefaultEventIndex()
          Deny knowledge of a default event.

int getDefaultPropertyIndex()
          Deny knowledge of a default property.

EventSetDescriptor[] getEventSetDescriptors()
          Deny knowledge of event sets.

Image getIcon(int iconKind)
          Claim there are no icons available.

MethodDescriptor[] getMethodDescriptors()
          Deny knowledge of methods.

PropertyDescriptor[] getPropertyDescriptors()
          Deny knowledge of properties.

Image loadImage(String resourceName)
          This is a utility method to help in loading icon images.

Methods inherited from class java.lang.Object

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

Fields inherited from interface java.beans.BeanInfo
`ICON_COLOR_16x16, ICON_COLOR_32x32, ICON_MONO_16x16, ICON_MONO_32x32`

Constructor Summary
`SimpleBeanInfo()`

Method Summary
`BeanInfo[]`	`getAdditionalBeanInfo()` Claim there are no other relevant BeanInfo objects.
`BeanDescriptor`	`getBeanDescriptor()` Deny knowledge about the class and customizer of the bean.
`int`	`getDefaultEventIndex()` Deny knowledge of a default event.
`int`	`getDefaultPropertyIndex()` Deny knowledge of a default property.
`EventSetDescriptor[]`	`getEventSetDescriptors()` Deny knowledge of event sets.
`Image`	`getIcon(int iconKind)` Claim there are no icons available.
`MethodDescriptor[]`	`getMethodDescriptors()` Deny knowledge of methods.
`PropertyDescriptor[]`	`getPropertyDescriptors()` Deny knowledge of properties.
`Image`	`loadImage(String resourceName)` This is a utility method to help in loading icon images.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

SimpleBeanInfo

public SimpleBeanInfo()

Method Detail

getBeanDescriptor

public BeanDescriptor getBeanDescriptor()

Deny knowledge about the class and customizer of the bean. You can override this if you wish to provide explicit info.

Specified by:: getBeanDescriptor in interface BeanInfo

Returns:: A BeanDescriptor providing overall information about the bean, such as its displayName, its customizer, etc. May return null if the information should be obtained by automatic analysis.

getPropertyDescriptors

public PropertyDescriptor[] getPropertyDescriptors()

Deny knowledge of properties. You can override this if you wish to provide explicit property info.

Specified by:: getPropertyDescriptors in interface BeanInfo

Returns:: An array of PropertyDescriptors describing the editable properties supported by this bean. May return null if the information should be obtained by automatic analysis.
If a property is indexed, then its entry in the result array will belong to the IndexedPropertyDescriptor subclass of PropertyDescriptor. A client of getPropertyDescriptors can use "instanceof" to check if a given PropertyDescriptor is an IndexedPropertyDescriptor.

getDefaultPropertyIndex

public int getDefaultPropertyIndex()

Deny knowledge of a default property. You can override this if you wish to define a default property for the bean.

Specified by:: getDefaultPropertyIndex in interface BeanInfo

Returns:: Index of default property in the PropertyDescriptor array returned by getPropertyDescriptors.
Returns -1 if there is no default property.

getEventSetDescriptors

public EventSetDescriptor[] getEventSetDescriptors()

Deny knowledge of event sets. You can override this if you wish to provide explicit event set info.

Specified by:: getEventSetDescriptors in interface BeanInfo

Returns:: An array of EventSetDescriptors describing the kinds of events fired by this bean. May return null if the information should be obtained by automatic analysis.

getDefaultEventIndex

public int getDefaultEventIndex()

Deny knowledge of a default event. You can override this if you wish to define a default event for the bean.

Specified by:: getDefaultEventIndex in interface BeanInfo

Returns:: Index of default event in the EventSetDescriptor array returned by getEventSetDescriptors.
Returns -1 if there is no default event.

getMethodDescriptors

public MethodDescriptor[] getMethodDescriptors()

Deny knowledge of methods. You can override this if you wish to provide explicit method info.

Specified by:: getMethodDescriptors in interface BeanInfo

Returns:: An array of MethodDescriptors describing the externally visible methods supported by this bean. May return null if the information should be obtained by automatic analysis.

getAdditionalBeanInfo

public BeanInfo[] getAdditionalBeanInfo()

Claim there are no other relevant BeanInfo objects. You may override this if you want to (for example) return a BeanInfo for a base class.

Specified by:: getAdditionalBeanInfo in interface BeanInfo

Returns:: an array of BeanInfo objects. May return null.

getIcon

public Image getIcon(int iconKind)

Claim there are no icons available. You can override this if you want to provide icons for your bean.

Specified by:: getIcon in interface BeanInfo

Parameters:: iconKind - The kind of icon requested. This should be one of the constant values ICON_COLOR_16x16, ICON_COLOR_32x32, ICON_MONO_16x16, or ICON_MONO_32x32.
Returns:: An image object representing the requested icon. May return null if no suitable icon is available.

loadImage

public Image loadImage(String resourceName)

This is a utility method to help in loading icon images. It takes the name of a resource file associated with the current object's class file and loads an image object from that file. Typically images will be GIFs.

Parameters:: resourceName - A pathname relative to the directory holding the class file of the current class. For example, "wombat.gif".
Returns:: an image object. May be null if the load failed.