java.beans
Interface BeanInfo
- BeanContextServiceProviderBeanInfo
- ExplicitBeanInfo, SimpleBeanInfo
BeanInfo can be implemented in order to provide explicit information to the Introspector.
When you write a BeanInfo class, you implement this interface
and provide explicit information by returning a non-null
value from the appropriate method. If you wish the
Introspector to determine certain information in the normal
way, just return null (or in the case of int methods, return
-1). There is a class called SimpleBeanInfo which returns
null from all methods, which you may extend and only
override the methods you wish to override.
When you have written the class, give it the name
<Bean Class Name>BeanInfo and place it in
the same package as the Bean, or in the bean info search path
(see Introspector for information on search paths).
A simple note about the way the Introspector interacts with
BeanInfo. Introspectors look at a Bean class and determine
if there is a BeanInfo class with it. If there is not a
BeanInfo class, it will behave as if the BeanInfo class
provided was a SimpleBeanInfo class (i.e. it will determine
all information automatically).
If there is a BeanInfo
class, then any methods that do *not* return null are
regarded as providing definitive information about the class
and all of its superclasses for those information types.
Even if a parent BeanInfo class explicitly returns that
information, it will not be used.
static int | ICON_COLOR_16x16- Use this as a parameter for the getIcon() command to retrieve a certain type of icon.
|
static int | ICON_COLOR_32x32- Use this as a parameter for the getIcon() command to retrieve a certain type of icon.
|
static int | ICON_MONO_16x16- Use this as a parameter for the getIcon() command to retrieve a certain type of icon.
|
static int | ICON_MONO_32x32- Use this as a parameter for the getIcon() command to retrieve a certain type of icon.
|
ICON_COLOR_16x16
public static final int ICON_COLOR_16x16
Use this as a parameter for the getIcon() command to retrieve a certain type of icon. *
ICON_COLOR_32x32
public static final int ICON_COLOR_32x32
Use this as a parameter for the getIcon() command to retrieve a certain type of icon. *
ICON_MONO_16x16
public static final int ICON_MONO_16x16
Use this as a parameter for the getIcon() command to retrieve a certain type of icon. *
ICON_MONO_32x32
public static final int ICON_MONO_32x32
Use this as a parameter for the getIcon() command to retrieve a certain type of icon. *
getAdditionalBeanInfo
public BeanInfo[] getAdditionalBeanInfo()
Get additional BeanInfos representing this Bean.
In this version of JavaBeans, this method is used so
that space and time can be saved by reading a BeanInfo
for each class in the hierarchy (super, super(super),
and so on).
The order of precedence when two pieces of BeanInfo
conflict (such as two PropertyDescriptors that have
the same name), in order from highest precedence to
lowest, is:
- This BeanInfo object.
getAdditionalBeanInfo()[getAdditionalBeanInfo().length]- ...
getAdditionalBeanInfo()[1]getAdditionalBeanInfo()[0]
Spec Note: It is possible that
returning
null from this method could
stop Introspection in its tracks, but it is unclear
from the spec whether this is the case.
- additional BeanInfos representing this Bean.
null may be returned (see Spec
Note, above).
getBeanDescriptor
public BeanDescriptor getBeanDescriptor()
Get the general description of this Bean type.
- the BeanDescriptor for the Bean, or null if
the BeanDescriptor should be obtained by
Introspection.
getDefaultEventIndex
public int getDefaultEventIndex()
Get the "default" event, basically the one a RAD tool
user is most likely to select.
- the index into the getEventSetDescriptors()
that the user is most likely to use. Returns
-1 if there is no default event.
getDefaultPropertyIndex
public int getDefaultPropertyIndex()
Get the "default" property, basically the one a RAD
tool user is most likely to select.
- the index into the getPropertyDescriptors()
that the user is most likely to use. Returns
-1 if there is no default event.
getEventSetDescriptors
public EventSetDescriptor[] getEventSetDescriptors()
Get the events this Bean type fires.
- the EventDescriptors representing events this
Bean fires. Returns
null if the
events are to be acquired by Introspection.
getIcon
public Image getIcon(int iconType)
Get a visual icon for this Bean.
A Bean does not have to support icons, and if it does
support icons, it does not have to support every single
type. Sun recommends that if you only support one
type, you support 16x16 color. Sun also notes that you
should try to use a type (like GIF) that allows for
transparent pixels, so that the background of the RAD
tool can show through.
Spec Note: If you do not support the
type of icon that is being asked for, but you do
support another type, it is unclear whether you should
return the other type or not. I would presume not.
iconType - the type of icon to get (see the
ICON_* constants in this class).
- the icon, or null if that type of icon is
unsupported by this Bean.
getMethodDescriptors
public MethodDescriptor[] getMethodDescriptors()
Get the methods this Bean type supports.
- the MethodDescriptors representing the
methods this Bean type supports. Returns
null if the methods are to be
obtained by Introspection.
getPropertyDescriptors
public PropertyDescriptor[] getPropertyDescriptors()
Get the properties (get/set method pairs) this Bean
type supports.
- the PropertyDescriptors representing the
properties this Bean type supports.
Returns
null if the properties
are to be obtained by Introspection.
java.beans.BeanInfo
Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of GNU Classpath.
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02110-1301 USA.
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