org.apache.commons.beanutils

Class WrapDynaBean

java.lang.Object

org.apache.commons.beanutils.WrapDynaBean

All Implemented Interfaces:

Serializable, DynaBean

Direct Known Subclasses:

ConvertingWrapDynaBean

public class WrapDynaBean
extends Object
implements DynaBean, Serializable

Implementation of DynaBean that wraps a standard JavaBean instance, so that DynaBean APIs can be used to access its properties.

The most common use cases for this class involve wrapping an existing java bean. (This makes it different from the typical use cases for other DynaBean's.) For example:

  Object aJavaBean = ...;
  ...
  DynaBean db = new WrapDynaBean(aJavaBean);
  ...
 

IMPLEMENTATION NOTE - This implementation does not support the contains() and remove() methods.

Version:

$Id$

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected WrapDynaClass	dynaClass The DynaClass "base class" that this DynaBean is associated with.
protected Object	instance The JavaBean instance wrapped by this WrapDynaBean.

Constructor Summary

Constructors

Constructor and Description
WrapDynaBean(Object instance) Construct a new DynaBean associated with the specified JavaBean instance.
WrapDynaBean(Object instance, WrapDynaClass cls) Creates a new instance of WrapDynaBean, associates it with the specified JavaBean instance, and initializes the bean's DynaClass.

Method Summary

Modifier and Type	Method and Description
boolean	contains(String name, String key) Does the specified mapped property contain a value for the specified key value?
Object	get(String name) Return the value of a simple property with the specified name.
Object	get(String name, int index) Return the value of an indexed property with the specified name.
Object	get(String name, String key) Return the value of a mapped property with the specified name, or null if there is no value for the specified key.
DynaClass	getDynaClass() Return the DynaClass instance that describes the set of properties available for this DynaBean.
protected DynaProperty	getDynaProperty(String name) Return the property descriptor for the specified property name.
Object	getInstance() Gets the bean instance wrapped by this DynaBean.
void	remove(String name, String key) Remove any existing value for the specified key on the specified mapped property.
void	set(String name, int index, Object value) Set the value of an indexed property with the specified name.
void	set(String name, Object value) Set the value of a simple property with the specified name.
void	set(String name, String key, Object value) Set the value of a mapped property with the specified name.

Methods inherited from class java.lang.Object

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

Field Detail

dynaClass

protected transient WrapDynaClass dynaClass

The DynaClass "base class" that this DynaBean is associated with.

instance

protected Object instance

The JavaBean instance wrapped by this WrapDynaBean.

Constructor Detail

WrapDynaBean

public WrapDynaBean(Object instance)

Construct a new DynaBean associated with the specified JavaBean instance.

Parameters:

instance - JavaBean instance to be wrapped

WrapDynaBean

public WrapDynaBean(Object instance,
                    WrapDynaClass cls)

Creates a new instance of WrapDynaBean, associates it with the specified JavaBean instance, and initializes the bean's DynaClass. Using this constructor this WrapDynaBean instance can be assigned a class which has been configured externally. If no WrapDynaClass is provided, a new one is created using a standard mechanism.

Parameters:

instance - JavaBean instance to be wrapped

cls - the optional WrapDynaClass to be used for this bean

Since:

1.9

Method Detail

contains

public boolean contains(String name,
                        String key)

Does the specified mapped property contain a value for the specified key value?

Specified by:

contains in interface DynaBean

Parameters:

name - Name of the property to check

key - Name of the key to check

Returns:

true if the mapped property contains a value for the specified key, otherwise false

Throws:

IllegalArgumentException - if there is no property of the specified name

get

public Object get(String name)

Return the value of a simple property with the specified name.

Specified by:

get in interface DynaBean

Parameters:

name - Name of the property whose value is to be retrieved

Returns:

The property's value

Throws:

IllegalArgumentException - if there is no property of the specified name

get

public Object get(String name,
                  int index)

Return the value of an indexed property with the specified name.

Specified by:

get in interface DynaBean

Parameters:

name - Name of the property whose value is to be retrieved

index - Index of the value to be retrieved

Returns:

The indexed property's value

Throws:

IllegalArgumentException - if there is no property of the specified name

IllegalArgumentException - if the specified property exists, but is not indexed

IndexOutOfBoundsException - if the specified index is outside the range of the underlying property

NullPointerException - if no array or List has been initialized for this property

get

public Object get(String name,
                  String key)

Return the value of a mapped property with the specified name, or null if there is no value for the specified key.

Specified by:

get in interface DynaBean

Parameters:

name - Name of the property whose value is to be retrieved

key - Key of the value to be retrieved

Returns:

The mapped property's value

Throws:

IllegalArgumentException - if there is no property of the specified name

IllegalArgumentException - if the specified property exists, but is not mapped

getDynaClass

public DynaClass getDynaClass()

Return the DynaClass instance that describes the set of properties available for this DynaBean.

Specified by:

getDynaClass in interface DynaBean

Returns:

The associated DynaClass

remove

public void remove(String name,
                   String key)

Remove any existing value for the specified key on the specified mapped property.

Specified by:

remove in interface DynaBean

Parameters:

name - Name of the property for which a value is to be removed

key - Key of the value to be removed

Throws:

IllegalArgumentException - if there is no property of the specified name

set

public void set(String name,
                Object value)

Set the value of a simple property with the specified name.

Specified by:

set in interface DynaBean

Parameters:

name - Name of the property whose value is to be set

value - Value to which this property is to be set

Throws:

ConversionException - if the specified value cannot be converted to the type required for this property

IllegalArgumentException - if there is no property of the specified name

NullPointerException - if an attempt is made to set a primitive property to null

set

public void set(String name,
                int index,
                Object value)

Set the value of an indexed property with the specified name.

Specified by:

set in interface DynaBean

Parameters:

name - Name of the property whose value is to be set

index - Index of the property to be set

value - Value to which this property is to be set

Throws:

ConversionException - if the specified value cannot be converted to the type required for this property

IllegalArgumentException - if there is no property of the specified name

IllegalArgumentException - if the specified property exists, but is not indexed

IndexOutOfBoundsException - if the specified index is outside the range of the underlying property

set

public void set(String name,
                String key,
                Object value)

Set the value of a mapped property with the specified name.

Specified by:

set in interface DynaBean

Parameters:

name - Name of the property whose value is to be set

key - Key of the property to be set

value - Value to which this property is to be set

Throws:

ConversionException - if the specified value cannot be converted to the type required for this property

IllegalArgumentException - if there is no property of the specified name

IllegalArgumentException - if the specified property exists, but is not mapped

getInstance

public Object getInstance()

Gets the bean instance wrapped by this DynaBean. For most common use cases, this object should already be known and this method safely be ignored. But some creators of frameworks using DynaBean's may find this useful.

Returns:

the java bean Object wrapped by this DynaBean

getDynaProperty

protected DynaProperty getDynaProperty(String name)

Return the property descriptor for the specified property name.

Parameters:

name - Name of the property for which to retrieve the descriptor

Returns:

The descriptor for the specified property

Throws:

IllegalArgumentException - if this is not a valid property name for our DynaClass