org.apache.commons.beanutils
Class WrapDynaClass
java.lang.Object
org.apache.commons.beanutils.WrapDynaClass
- DynaClass
public class WrapDynaClass
extends java.lang.Object
Implementation of
DynaClass
for DynaBeans that wrap
standard JavaBean instances.
It is suggested that this class should not usually need to be used directly
to create new
WrapDynaBean
instances.
It's usually better to call the
WrapDynaBean
constructor directly.
For example:
Object javaBean = ...;
DynaBean wrapper = new WrapDynaBean(javaBean);
$Revision: 556229 $ $Date: 2007-07-14 07:11:19 +0100 (Sat, 14 Jul 2007) $private static ContextClassLoaderLocal | CLASSLOADER_CACHE
|
protected Class | beanClass - The JavaBean
Class which is represented by this
WrapDynaClass .
|
protected PropertyDescriptor[] | descriptors - The set of PropertyDescriptors for this bean class.
|
protected HashMap | descriptorsMap - The set of PropertyDescriptors for this bean class, keyed by the
property name.
|
protected static HashMap | dynaClasses - The dynaClasses Map will be removed in a subsequent release
|
protected DynaProperty[] | properties - The set of dynamic properties that are part of this DynaClass.
|
protected HashMap | propertiesMap - The set of dynamic properties that are part of this DynaClass,
keyed by the property name.
|
WrapDynaClass(Class beanClass) - Construct a new WrapDynaClass for the specified JavaBean class.
|
static void | clear() - Clear our cache of WrapDynaClass instances.
|
static WrapDynaClass | createDynaClass(Class beanClass) - Create (if necessary) and return a new
WrapDynaClass
instance for the specified bean class.
|
private static Map | getDynaClassesMap() - Get the wrap dyna classes cache
|
DynaProperty[] | getDynaProperties() - Return an array of
ProperyDescriptors for the properties
currently defined in this DynaClass.
|
DynaProperty | getDynaProperty(String name) - Return a property descriptor for the specified property, if it exists;
otherwise, return
null .
|
String | getName() - Return the name of this DynaClass (analogous to the
getName() method of java.lang.Class DynaClass implementation class to support
different dynamic classes, with different sets of properties.
|
PropertyDescriptor | getPropertyDescriptor(String name) - Return the PropertyDescriptor for the specified property name, if any;
otherwise return
null .
|
protected void | introspect() - Introspect our bean class to identify the supported properties.
|
DynaBean | newInstance() - Instantiates a new standard JavaBean instance associated with
this DynaClass and return it wrapped in a new WrapDynaBean
instance.
|
beanClass
protected Class beanClass
The JavaBean Class
which is represented by this
WrapDynaClass
.
descriptors
protected PropertyDescriptor[] descriptors
The set of PropertyDescriptors for this bean class.
descriptorsMap
protected HashMap descriptorsMap
The set of PropertyDescriptors for this bean class, keyed by the
property name. Individual descriptor instances will be the same
instances as those in the descriptors
list.
dynaClasses
protected static HashMap dynaClasses
The dynaClasses Map will be removed in a subsequent release
The set of
WrapDynaClass
instances that have ever been
created, keyed by the underlying bean Class. The keys to this map
are Class objects, and the values are corresponding WrapDynaClass
objects.
This static variable is safe even when this code is deployed via a
shared classloader because it is keyed via a Class object. The same
class loaded via two different classloaders will result in different
entries in this map.
Note, however, that this HashMap can result in a memory leak. When
this class is in a shared classloader it will retain references to
classes loaded via a webapp classloader even after the webapp has been
undeployed. That will prevent the entire classloader and all the classes
it refers to and all their static members from being freed.
!!!!!!!!!!!! PLEASE NOTE !!!!!!!!!!!! *************
THE FOLLOWING IS A NASTY HACK TO SO THAT BEANUTILS REMAINS BINARY
COMPATIBLE WITH PREVIOUS RELEASES.
There are two issues here:
1) Memory Issues: The static HashMap caused memory problems (See BEANUTILS-59)
to resolve this it has been moved into a ContextClassLoaderLocal instance
(named CLASSLOADER_CACHE above) which holds one copy per
ClassLoader in a WeakHashMap.
2) Binary Compatibility: As the "dynaClasses" static HashMap is "protected"
removing it breaks BeanUtils binary compatibility with previous versions.
To resolve this all the methods have been overriden to delegate to the
Map for the ClassLoader in the ContextClassLoaderLocal.
properties
protected DynaProperty[] properties
The set of dynamic properties that are part of this DynaClass.
propertiesMap
protected HashMap propertiesMap
The set of dynamic properties that are part of this DynaClass,
keyed by the property name. Individual descriptor instances will
be the same instances as those in the properties
list.
WrapDynaClass
private WrapDynaClass(Class beanClass)
Construct a new WrapDynaClass for the specified JavaBean class. This
constructor is private; WrapDynaClass instances will be created as
needed via calls to the createDynaClass(Class)
method.
beanClass
- JavaBean class to be introspected around
clear
public static void clear()
Clear our cache of WrapDynaClass instances.
createDynaClass
public static WrapDynaClass createDynaClass(Class beanClass)
Create (if necessary) and return a new WrapDynaClass
instance for the specified bean class.
beanClass
- Bean class for which a WrapDynaClass is requested
getDynaClassesMap
private static Map getDynaClassesMap()
Get the wrap dyna classes cache
getDynaProperties
public DynaProperty[] getDynaProperties()
Return an array of
ProperyDescriptors
for the properties
currently defined in this DynaClass. If no properties are defined, a
zero-length array will be returned.
FIXME - Should we really be implementing
getBeanInfo()
instead, which returns property descriptors
and a bunch of other stuff?
- getDynaProperties in interface DynaClass
- the set of properties for this DynaClass
getDynaProperty
public DynaProperty getDynaProperty(String name)
Return a property descriptor for the specified property, if it exists;
otherwise, return null
.
- getDynaProperty in interface DynaClass
name
- Name of the dynamic property for which a descriptor
is requested
- The descriptor for the specified property
getName
public String getName()
Return the name of this DynaClass (analogous to the
getName()
method of java.lang.Class
DynaClass
implementation class to support
different dynamic classes, with different sets of properties.
- getName in interface DynaClass
- the name of the DynaClass
getPropertyDescriptor
public PropertyDescriptor getPropertyDescriptor(String name)
Return the PropertyDescriptor for the specified property name, if any;
otherwise return null
.
name
- Name of the property to be retrieved
- The descriptor for the specified property
introspect
protected void introspect()
Introspect our bean class to identify the supported properties.
newInstance
public DynaBean newInstance()
throws IllegalAccessException,
InstantiationException
Instantiates a new standard JavaBean instance associated with
this DynaClass and return it wrapped in a new WrapDynaBean
instance.
NOTE the JavaBean should have a
no argument constructor.
NOTE - Most common use cases should not need to use
this method. It is usually better to create new
WrapDynaBean
instances by calling its constructor.
For example:
Object javaBean = ...;
DynaBean wrapper = new WrapDynaBean(javaBean);
(This method is needed for some kinds of
DynaBean
framework.)
- newInstance in interface DynaClass
Copyright (c) 2001-2007 - Apache Software Foundation