A bean implementor who wishes to provide explicit information about
their bean may provide a BeanInfo class that implements this BeanInfo
interface and provides explicit information about the methods,
properties, events, etc, of their bean.
A bean implementor doesn't need to provide a complete set of
explicit information. You can pick and choose which information
you want to provide and the rest will be obtained by automatic
analysis using low-level reflection of the bean classes' methods
and applying standard design patterns.
You get the opportunity to provide lots and lots of different
information as part of the various XyZDescriptor classes. But
don't panic, you only really need to provide the minimal core
information required by the various constructors.
See also the SimpleBeanInfo class which provides a convenient
"noop" base class for BeanInfo classes, which you can override
for those specific places where you want to return explicit info.
To learn about all the behaviour of a bean see the Introspector class.
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.
This method allows a BeanInfo object to return an arbitrary collection
of other BeanInfo objects that provide additional information on the
If there are conflicts or overlaps between the information provided
by different BeanInfo objects, then the current BeanInfo takes precedence
over the getAdditionalBeanInfo objects, and later elements in the array
take precedence over earlier ones.