org.springframework.beans
Interface BeanWrapper

All Superinterfaces:

ConfigurablePropertyAccessor, PropertyAccessor, PropertyEditorRegistry, TypeConverter

All Known Implementing Classes:

BeanWrapperImpl

public interface BeanWrapper
extends ConfigurablePropertyAccessor, TypeConverter

The central interface of Spring's low-level JavaBeans infrastructure.

Typically not used directly but rather implicitly via a BeanFactory or a DataBinder.

Provides operations to analyze and manipulate standard Java Beans: the ability to get and set property values (individually or in bulk), get property descriptors, and query the readability/writability of properties.

This interface supports nested properties enabling the setting of properties on subproperties to an unlimited depth. A BeanWrapper instance can be used repeatedly, with its target object (the wrapped Java Bean instance) changing as required.

A BeanWrapper's default for the "extractOldValueForEditor" setting is "false", to avoid side effects caused by getter method invocations. Turn this to "true" to expose present property values to custom editors.

Since:

13 April 2001

Author:

Rod Johnson, Juergen Hoeller

See Also:

ConfigurablePropertyAccessor.setExtractOldValueForEditor(boolean), PropertyAccessor, PropertyEditorRegistry, BeanWrapperImpl, BeanFactory, BeanPropertyBindingResult, DataBinder.initBeanPropertyAccess()

Field Summary

Fields inherited from interface org.springframework.beans.PropertyAccessor

NESTED_PROPERTY_SEPARATOR, NESTED_PROPERTY_SEPARATOR_CHAR, PROPERTY_KEY_PREFIX, PROPERTY_KEY_PREFIX_CHAR, PROPERTY_KEY_SUFFIX, PROPERTY_KEY_SUFFIX_CHAR

Method Summary

PropertyDescriptor	getPropertyDescriptor(String propertyName) Get the property descriptor for a particular property.
PropertyDescriptor[]	getPropertyDescriptors() Get the PropertyDescriptors identified on this object (standard JavaBeans introspection).
Class	getWrappedClass() Convenience method to return the class of the wrapped object.
Object	getWrappedInstance() Return the bean wrapped by this object (cannot be null).
void	setWrappedInstance(Object obj) Change the wrapped object.

Methods inherited from interface org.springframework.beans.ConfigurablePropertyAccessor

isExtractOldValueForEditor, setExtractOldValueForEditor

Methods inherited from interface org.springframework.beans.PropertyAccessor

getPropertyType, getPropertyValue, isReadableProperty, isWritableProperty, setPropertyValue, setPropertyValue, setPropertyValues, setPropertyValues, setPropertyValues, setPropertyValues

Methods inherited from interface org.springframework.beans.PropertyEditorRegistry

findCustomEditor, registerCustomEditor, registerCustomEditor

Methods inherited from interface org.springframework.beans.TypeConverter

convertIfNecessary, convertIfNecessary

Method Detail

setWrappedInstance

void setWrappedInstance(Object obj)

Change the wrapped object. Implementations are required to allow the type of the wrapped object to change.

Parameters:

obj - wrapped object that we are manipulating

getWrappedInstance

Object getWrappedInstance()

Return the bean wrapped by this object (cannot be null).

Returns:

the bean wrapped by this object

getWrappedClass

Class getWrappedClass()

Convenience method to return the class of the wrapped object.

Returns:

the class of the wrapped object

getPropertyDescriptors

PropertyDescriptor[] getPropertyDescriptors()
                                            throws BeansException

Get the PropertyDescriptors identified on this object (standard JavaBeans introspection).

Returns:

the PropertyDescriptors identified on this object

Throws:

BeansException

getPropertyDescriptor

PropertyDescriptor getPropertyDescriptor(String propertyName)
                                         throws BeansException

Get the property descriptor for a particular property.

Parameters:

propertyName - property to check status for

Returns:

the property descriptor for the particular property

Throws:

InvalidPropertyException - if there is no such property

BeansException