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BeanWrapperImpl (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.beans
Class BeanWrapperImpl

java.lang.Object
  org.springframework.beans.PropertyEditorRegistrySupport
      org.springframework.beans.AbstractPropertyAccessor
          org.springframework.beans.BeanWrapperImpl

All Implemented Interfaces:

BeanWrapper, ConfigurablePropertyAccessor, PropertyAccessor, PropertyEditorRegistry, TypeConverter

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public class BeanWrapperImpl
extends AbstractPropertyAccessor
implements BeanWrapper

Default BeanWrapper implementation that should be sufficient for all typical use cases. Caches introspection results for efficiency.

Note: Auto-registers default property editors from the org.springframework.beans.propertyeditors package, which apply in addition to the JDK's standard PropertyEditors. Applications can call the PropertyEditorRegistrySupport.registerCustomEditor(Class, java.beans.PropertyEditor) method to register an editor for a particular instance (i.e. they are not shared across the application). See the base class PropertyEditorRegistrySupport for details.

BeanWrapperImpl will convert collection and array values to the corresponding target collections or arrays, if necessary. Custom property editors that deal with collections or arrays can either be written via PropertyEditor's setValue, or against a comma-delimited String via setAsText, as String arrays are converted in such a format if the array itself is not assignable.

Since:

15 April 2001

Author:

Rod Johnson, Juergen Hoeller, Rob Harrop

See Also:

PropertyEditorRegistrySupport.registerCustomEditor(java.lang.Class, java.beans.PropertyEditor), AbstractPropertyAccessor.setPropertyValues(java.util.Map), setPropertyValue(java.lang.String, java.lang.Object), getPropertyValue(java.lang.String), getPropertyType(java.lang.String), BeanWrapper, PropertyEditorRegistrySupport

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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

 

Constructor Summary
BeanWrapperImpl()           Create new empty BeanWrapperImpl.
BeanWrapperImpl(boolean registerDefaultEditors)           Create new empty BeanWrapperImpl.
BeanWrapperImpl(Class clazz)           Create new BeanWrapperImpl, wrapping a new instance of the specified class.
BeanWrapperImpl(Object object)           Create new BeanWrapperImpl for the given object.
BeanWrapperImpl(Object object, String nestedPath, Object rootObject)           Create new BeanWrapperImpl for the given object, registering a nested path that the object is in.

 

Method Summary
Object	convertForProperty(Object value, String propertyName)           Convert the given value for the specified property to the latter's type.
Object	convertIfNecessary(Object value, Class requiredType)           Convert the value to the required type (if necessary from a String).
Object	convertIfNecessary(Object value, Class requiredType, MethodParameter methodParam)           Convert the value to the required type (if necessary from a String).
Object	doTypeConversionIfNecessary(Object value, Class requiredType)           Deprecated. in favor of convertIfNecessary
protected  BeanWrapperImpl	getBeanWrapperForPropertyPath(String propertyPath)           Recursively navigate to return a BeanWrapper for the nested property path.
String	getNestedPath()           Return the nested path of the object wrapped by this BeanWrapper.
PropertyDescriptor	getPropertyDescriptor(String propertyName)           Obtain the property descriptor for a specific property of the wrapped object.
protected  PropertyDescriptor	getPropertyDescriptorInternal(String propertyName)           Internal version of getPropertyDescriptor(java.lang.String): Returns null if not found rather than throwing an exception.
PropertyDescriptor[]	getPropertyDescriptors()           Obtain the PropertyDescriptors for the wrapped object (as determined by standard JavaBeans introspection).
Class	getPropertyType(String propertyName)           Determine the property type for the given property path.
Object	getPropertyValue(String propertyName)           Actually get the value of a property.
Class	getRootClass()           Return the class of the root object at the top of the path of this BeanWrapper.
Object	getRootInstance()           Return the root object at the top of the path of this BeanWrapper.
Class	getWrappedClass()           Return the type of the wrapped JavaBean object.
Object	getWrappedInstance()           Return the bean instance wrapped by this object, if any.
boolean	isReadableProperty(String propertyName)           Determine whether the specified property is readable.
boolean	isWritableProperty(String propertyName)           Determine whether the specified property is writable.
protected  BeanWrapperImpl	newNestedBeanWrapper(Object object, String nestedPath)           Create a new nested BeanWrapper instance.
protected  void	setIntrospectionClass(Class clazz)           Set the class to introspect.
void	setPropertyValue(PropertyValue pv)           Set the specified value as current property value.
void	setPropertyValue(String propertyName, Object value)           Actually set a property value.
void	setWrappedInstance(Object object)           Switch the target object, replacing the cached introspection results only if the class of the new object is different to that of the replaced object.
void	setWrappedInstance(Object object, String nestedPath, Object rootObject)           Switch the target object, replacing the cached introspection results only if the class of the new object is different to that of the replaced object.
String	toString()

 

Methods inherited from class org.springframework.beans.AbstractPropertyAccessor
isExtractOldValueForEditor, setExtractOldValueForEditor, setPropertyValues, setPropertyValues, setPropertyValues, setPropertyValues

 

Methods inherited from class org.springframework.beans.PropertyEditorRegistrySupport
copyCustomEditorsTo, copyDefaultEditorsTo, findCustomEditor, getDefaultEditor, guessPropertyTypeFromEditors, hasCustomEditorForElement, isSharedEditor, registerCustomEditor, registerCustomEditor, registerDefaultEditors, registerSharedEditor, useConfigValueEditors

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Methods inherited from interface org.springframework.beans.ConfigurablePropertyAccessor
isExtractOldValueForEditor, setExtractOldValueForEditor

 

Methods inherited from interface org.springframework.beans.PropertyAccessor
setPropertyValues, setPropertyValues, setPropertyValues, setPropertyValues

 

Methods inherited from interface org.springframework.beans.PropertyEditorRegistry
findCustomEditor, registerCustomEditor, registerCustomEditor

 

Constructor Detail

BeanWrapperImpl

public BeanWrapperImpl()

Create new empty BeanWrapperImpl. Wrapped instance needs to be set afterwards. Registers default editors.

See Also:

setWrappedInstance(java.lang.Object)

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BeanWrapperImpl

public BeanWrapperImpl(boolean registerDefaultEditors)

Create new empty BeanWrapperImpl. Wrapped instance needs to be set afterwards.

Parameters:

registerDefaultEditors - whether to register default editors (can be suppressed if the BeanWrapper won't need any type conversion)

See Also:

setWrappedInstance(java.lang.Object)

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BeanWrapperImpl

public BeanWrapperImpl(Object object)

Create new BeanWrapperImpl for the given object.

Parameters:

object - object wrapped by this BeanWrapper

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BeanWrapperImpl

public BeanWrapperImpl(Class clazz)

Create new BeanWrapperImpl, wrapping a new instance of the specified class.

Parameters:

clazz - class to instantiate and wrap

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BeanWrapperImpl

public BeanWrapperImpl(Object object,
                       String nestedPath,
                       Object rootObject)

Create new BeanWrapperImpl for the given object, registering a nested path that the object is in.

Parameters:

object - object wrapped by this BeanWrapper

nestedPath - the nested path of the object

rootObject - the root object at the top of the path

Method Detail

setWrappedInstance

public void setWrappedInstance(Object object)

Switch the target object, replacing the cached introspection results only if the class of the new object is different to that of the replaced object.

Specified by:

setWrappedInstance in interface BeanWrapper

Parameters:

object - the new target object

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setWrappedInstance

public void setWrappedInstance(Object object,
                               String nestedPath,
                               Object rootObject)

Switch the target object, replacing the cached introspection results only if the class of the new object is different to that of the replaced object.

Parameters:

object - the new target object

nestedPath - the nested path of the object

rootObject - the root object at the top of the path

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getWrappedInstance

public final Object getWrappedInstance()

Description copied from interface: BeanWrapper

Return the bean instance wrapped by this object, if any.

Specified by:

getWrappedInstance in interface BeanWrapper

Returns:

the bean instance, or null if none set

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getWrappedClass

public final Class getWrappedClass()

Description copied from interface: BeanWrapper

Return the type of the wrapped JavaBean object.

Specified by:

getWrappedClass in interface BeanWrapper

Returns:

the type of the wrapped bean instance, or null if no wrapped object has been set

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getNestedPath

public final String getNestedPath()

Return the nested path of the object wrapped by this BeanWrapper.

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getRootInstance

public final Object getRootInstance()

Return the root object at the top of the path of this BeanWrapper.

See Also:

getNestedPath()

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getRootClass

public final Class getRootClass()

Return the class of the root object at the top of the path of this BeanWrapper.

See Also:

getNestedPath()

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setIntrospectionClass

protected void setIntrospectionClass(Class clazz)

Set the class to introspect. Needs to be called when the target object changes.

Parameters:

clazz - the class to introspect

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getPropertyDescriptors

public PropertyDescriptor[] getPropertyDescriptors()

Description copied from interface: BeanWrapper

Obtain the PropertyDescriptors for the wrapped object (as determined by standard JavaBeans introspection).

Specified by:

getPropertyDescriptors in interface BeanWrapper

Returns:

the PropertyDescriptors for the wrapped object

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getPropertyDescriptor

public PropertyDescriptor getPropertyDescriptor(String propertyName)
                                         throws BeansException

Description copied from interface: BeanWrapper

Obtain the property descriptor for a specific property of the wrapped object.

Specified by:

getPropertyDescriptor in interface BeanWrapper

Parameters:

propertyName - the property to obtain the descriptor for (may be a nested path, but no indexed/mapped property)

Returns:

the property descriptor for the specified property

Throws:

InvalidPropertyException - if there is no such property

BeansException

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getPropertyDescriptorInternal

protected PropertyDescriptor getPropertyDescriptorInternal(String propertyName)
                                                    throws BeansException

Internal version of getPropertyDescriptor(java.lang.String): Returns null if not found rather than throwing an exception.

Parameters:

propertyName - the property to obtain the descriptor for

Returns:

the property descriptor for the specified property, or null if not found

Throws:

BeansException - in case of introspection failure

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getPropertyType

public Class getPropertyType(String propertyName)
                      throws BeansException

Description copied from class: PropertyEditorRegistrySupport

Determine the property type for the given property path.

Called by PropertyEditorRegistrySupport.findCustomEditor(java.lang.Class, java.lang.String) if no required type has been specified, to be able to find a type-specific editor even if just given a property path.

The default implementation always returns null. BeanWrapperImpl overrides this with the standard getPropertyType method as defined by the BeanWrapper interface.

Specified by:

getPropertyType in interface PropertyAccessor

Overrides:

getPropertyType in class AbstractPropertyAccessor

Parameters:

propertyName - the property path to determine the type for

Returns:

the type of the property, or null if not determinable

Throws:

InvalidPropertyException - if there is no such property or if the property isn't readable

PropertyAccessException - if the property was valid but the accessor method failed

BeansException

See Also:

PropertyAccessor.getPropertyType(String)

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isReadableProperty

public boolean isReadableProperty(String propertyName)

Description copied from interface: PropertyAccessor

Determine whether the specified property is readable.

Returns false if the property doesn't exist.

Specified by:

isReadableProperty in interface PropertyAccessor

Parameters:

propertyName - the property to check (may be a nested path and/or an indexed/mapped property)

Returns:

whether the property is readable

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isWritableProperty

public boolean isWritableProperty(String propertyName)

Description copied from interface: PropertyAccessor

Determine whether the specified property is writable.

Returns false if the property doesn't exist.

Specified by:

isWritableProperty in interface PropertyAccessor

Parameters:

propertyName - the property to check (may be a nested path and/or an indexed/mapped property)

Returns:

whether the property is writable

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doTypeConversionIfNecessary

public Object doTypeConversionIfNecessary(Object value,
                                          Class requiredType)
                                   throws TypeMismatchException

Deprecated. in favor of convertIfNecessary

Throws:

TypeMismatchException

See Also:

convertIfNecessary(Object, Class)

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convertIfNecessary

public Object convertIfNecessary(Object value,
                                 Class requiredType)
                          throws TypeMismatchException

Description copied from interface: TypeConverter

Convert the value to the required type (if necessary from a String).

Conversions from String to any type will typically use the setAsText method of the PropertyEditor class. Note that a PropertyEditor must be registered for the given class for this to work; this is a standard JavaBeans API. A number of PropertyEditors are automatically registered.

Specified by:

convertIfNecessary in interface TypeConverter

Parameters:

value - the value to convert

requiredType - the type we must convert to (or null if not known, for example in case of a collection element)

Returns:

the new value, possibly the result of type conversion

Throws:

TypeMismatchException - if type conversion failed

See Also:

PropertyEditor.setAsText(String), PropertyEditor.getValue()

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convertIfNecessary

public Object convertIfNecessary(Object value,
                                 Class requiredType,
                                 MethodParameter methodParam)
                          throws TypeMismatchException

Description copied from interface: TypeConverter

Convert the value to the required type (if necessary from a String).

Conversions from String to any type will typically use the setAsText method of the PropertyEditor class. Note that a PropertyEditor must be registered for the given class for this to work; this is a standard JavaBeans API. A number of PropertyEditors are automatically registered.

Specified by:

convertIfNecessary in interface TypeConverter

Parameters:

value - the value to convert

requiredType - the type we must convert to (or null if not known, for example in case of a collection element)

methodParam - the method parameter that is the target of the conversion (for analysis of generic types; may be null)

Returns:

the new value, possibly the result of type conversion

Throws:

TypeMismatchException - if type conversion failed

See Also:

PropertyEditor.setAsText(String), PropertyEditor.getValue()

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convertForProperty

public Object convertForProperty(Object value,
                                 String propertyName)
                          throws TypeMismatchException

Convert the given value for the specified property to the latter's type.

This method is only intended for optimizations in a BeanFactory. Use the convertIfNecessary methods for programmatic conversion.

Parameters:

value - the value to convert

propertyName - the target property (note that nested or indexed properties are not supported here)

Returns:

the new value, possibly the result of type conversion

Throws:

TypeMismatchException - if type conversion failed

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getBeanWrapperForPropertyPath

protected BeanWrapperImpl getBeanWrapperForPropertyPath(String propertyPath)

Recursively navigate to return a BeanWrapper for the nested property path.

Parameters:

propertyPath - property property path, which may be nested

Returns:

a BeanWrapper for the target bean

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newNestedBeanWrapper

protected BeanWrapperImpl newNestedBeanWrapper(Object object,
                                               String nestedPath)

Create a new nested BeanWrapper instance.

Default implementation creates a BeanWrapperImpl instance. Can be overridden in subclasses to create a BeanWrapperImpl subclass.

Parameters:

object - object wrapped by this BeanWrapper

nestedPath - the nested path of the object

Returns:

the nested BeanWrapper instance

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getPropertyValue

public Object getPropertyValue(String propertyName)
                        throws BeansException

Description copied from class: AbstractPropertyAccessor

Actually get the value of a property.

Specified by:

getPropertyValue in interface PropertyAccessor

Specified by:

getPropertyValue in class AbstractPropertyAccessor

Parameters:

propertyName - name of the property to get the value of

Returns:

the value of the property

Throws:

InvalidPropertyException - if there is no such property or if the property isn't readable

PropertyAccessException - if the property was valid but the accessor method failed

BeansException

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setPropertyValue

public void setPropertyValue(String propertyName,
                             Object value)
                      throws BeansException

Description copied from class: AbstractPropertyAccessor

Actually set a property value.

Specified by:

setPropertyValue in interface PropertyAccessor

Specified by:

setPropertyValue in class AbstractPropertyAccessor

Parameters:

propertyName - name of the property to set value of

value - the new value

Throws:

InvalidPropertyException - if there is no such property or if the property isn't writable

PropertyAccessException - if the property was valid but the accessor method failed or a type mismatch occured

BeansException

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setPropertyValue

public void setPropertyValue(PropertyValue pv)
                      throws BeansException

Description copied from interface: PropertyAccessor

Set the specified value as current property value.

Specified by:

setPropertyValue in interface PropertyAccessor

Overrides:

setPropertyValue in class AbstractPropertyAccessor

Parameters:

pv - an object containing the new property value

Throws:

InvalidPropertyException - if there is no such property or if the property isn't writable

PropertyAccessException - if the property was valid but the accessor method failed or a type mismatch occured

BeansException

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toString

public String toString()

Overrides:

toString in class Object

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