Class AbstractNestablePropertyAccessor

java.lang.Object

org.springframework.beans.PropertyEditorRegistrySupport

org.springframework.beans.TypeConverterSupport

org.springframework.beans.AbstractPropertyAccessor

org.springframework.beans.AbstractNestablePropertyAccessor

All Implemented Interfaces:

ConfigurablePropertyAccessor, PropertyAccessor, PropertyEditorRegistry, TypeConverter

Direct Known Subclasses:

BeanWrapperImpl, DirectFieldAccessor

public abstract class AbstractNestablePropertyAccessor
extends AbstractPropertyAccessor

A basic ConfigurablePropertyAccessor that provides the necessary infrastructure for all typical use cases.

This accessor 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:

4.2

Author:

Juergen Hoeller, Stephane Nicoll, Rod Johnson, Rob Harrop, Sam Brannen

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

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	AbstractNestablePropertyAccessor.PropertyHandler	A handler for a specific property.
protected static class	AbstractNestablePropertyAccessor.PropertyTokenHolder	Holder class used to store property tokens.

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

Constructors

Modifier	Constructor	Description
protected	AbstractNestablePropertyAccessor()	Create a new empty accessor.
protected	AbstractNestablePropertyAccessor(boolean registerDefaultEditors)	Create a new empty accessor.
protected	AbstractNestablePropertyAccessor(Class<?> clazz)	Create a new accessor, wrapping a new instance of the specified class.
protected	AbstractNestablePropertyAccessor(Object object)	Create a new accessor for the given object.
protected	AbstractNestablePropertyAccessor(Object object, String nestedPath, Object rootObject)	Create a new accessor for the given object, registering a nested path that the object is in.
protected	AbstractNestablePropertyAccessor(Object object, String nestedPath, AbstractNestablePropertyAccessor parent)	Create a new accessor for the given object, registering a nested path that the object is in.

Method Summary

Modifier and Type	Method	Description
protected @Nullable Object	convertForProperty(String propertyName, @Nullable Object oldValue, @Nullable Object newValue, TypeDescriptor td)
protected abstract NotWritablePropertyException	createNotWritablePropertyException(String propertyName)	Create a NotWritablePropertyException for the specified property.
int	getAutoGrowCollectionLimit()	Return the limit for array and collection auto-growing.
protected String	getFinalPath(AbstractNestablePropertyAccessor pa, String nestedPath)	Get the last component of the path.
protected abstract @Nullable AbstractNestablePropertyAccessor.PropertyHandler	getLocalPropertyHandler(String propertyName)	Return a AbstractNestablePropertyAccessor.PropertyHandler for the specified local propertyName.
final String	getNestedPath()	Return the nested path of the object wrapped by this accessor.
protected AbstractNestablePropertyAccessor	getPropertyAccessorForPropertyPath(String propertyPath)	Recursively navigate to return a property accessor for the nested property path.
protected @Nullable AbstractNestablePropertyAccessor.PropertyHandler	getPropertyHandler(String propertyName)	Return the AbstractNestablePropertyAccessor.PropertyHandler for the specified propertyName, navigating if necessary.
@Nullable Class<?>	getPropertyType(String propertyName)	Determine the property type for the given property path.
@Nullable TypeDescriptor	getPropertyTypeDescriptor(String propertyName)	Return a type descriptor for the specified property: preferably from the read method, falling back to the write method.
@Nullable Object	getPropertyValue(String propertyName)	Actually get the value of a property.
protected @Nullable Object	getPropertyValue(AbstractNestablePropertyAccessor.PropertyTokenHolder tokens)
final Class<?>	getRootClass()	Return the class of the root object at the top of the path of this accessor.
final Object	getRootInstance()	Return the root object at the top of the path of this accessor.
final Class<?>	getWrappedClass()
final Object	getWrappedInstance()
boolean	isReadableProperty(String propertyName)	Determine whether the specified property is readable.
boolean	isWritableProperty(String propertyName)	Determine whether the specified property is writable.
protected abstract AbstractNestablePropertyAccessor	newNestedPropertyAccessor(Object object, String nestedPath)	Create a new nested property accessor instance.
void	setAutoGrowCollectionLimit(int autoGrowCollectionLimit)	Specify a limit for array and collection auto-growing.
void	setPropertyValue(String propertyName, @Nullable Object value)	Actually set a property value.
protected void	setPropertyValue(AbstractNestablePropertyAccessor.PropertyTokenHolder tokens, PropertyValue pv)
void	setPropertyValue(PropertyValue pv)	Set the specified value as current 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, @Nullable String nestedPath, @Nullable 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

isAutoGrowNestedPaths, isExtractOldValueForEditor, setAutoGrowNestedPaths, setExtractOldValueForEditor, setPropertyValues, setPropertyValues, setPropertyValues, setPropertyValues

Methods inherited from class org.springframework.beans.TypeConverterSupport

convertIfNecessary, convertIfNecessary, convertIfNecessary, convertIfNecessary

Methods inherited from class org.springframework.beans.PropertyEditorRegistrySupport

copyCustomEditorsTo, copyDefaultEditorsTo, findCustomEditor, getConversionService, getDefaultEditor, guessPropertyTypeFromEditors, hasCustomEditorForElement, overrideDefaultEditor, registerCustomEditor, registerCustomEditor, registerDefaultEditors, setConversionService, setDefaultEditorRegistrar, 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

getConversionService, setConversionService

Methods inherited from interface org.springframework.beans.PropertyEditorRegistry

findCustomEditor, registerCustomEditor, registerCustomEditor

Methods inherited from interface org.springframework.beans.TypeConverter

convertIfNecessary, convertIfNecessary, convertIfNecessary, convertIfNecessary

Constructor Details

AbstractNestablePropertyAccessor

protected AbstractNestablePropertyAccessor()

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

See Also:

• setWrappedInstance(java.lang.Object)

AbstractNestablePropertyAccessor

protected AbstractNestablePropertyAccessor(boolean registerDefaultEditors)

Create a new empty accessor. Wrapped instance needs to be set afterwards.

Parameters:

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

See Also:

• setWrappedInstance(java.lang.Object)

AbstractNestablePropertyAccessor

protected AbstractNestablePropertyAccessor(Object object)

Create a new accessor for the given object.

Parameters:

object - the object wrapped by this accessor

AbstractNestablePropertyAccessor

protected AbstractNestablePropertyAccessor(Class<?> clazz)

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

Parameters:

clazz - class to instantiate and wrap

AbstractNestablePropertyAccessor

protected AbstractNestablePropertyAccessor(Object object,
 String nestedPath,
 Object rootObject)

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

Parameters:

object - the object wrapped by this accessor

nestedPath - the nested path of the object

rootObject - the root object at the top of the path

AbstractNestablePropertyAccessor

protected AbstractNestablePropertyAccessor(Object object,
 String nestedPath,
 AbstractNestablePropertyAccessor parent)

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

Parameters:

object - the object wrapped by this accessor

nestedPath - the nested path of the object

parent - the containing accessor (must not be null)

Method Details

setAutoGrowCollectionLimit

public void setAutoGrowCollectionLimit(int autoGrowCollectionLimit)

Specify a limit for array and collection auto-growing.

Default is unlimited on a plain accessor.

getAutoGrowCollectionLimit

public int getAutoGrowCollectionLimit()

Return the limit for array and collection auto-growing.

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.

Parameters:

object - the new target object

setWrappedInstance

public void setWrappedInstance(Object object,
 @Nullable String nestedPath,
 @Nullable 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

getWrappedInstance

public final Object getWrappedInstance()

getWrappedClass

public final Class<?> getWrappedClass()

getNestedPath

public final String getNestedPath()

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

getRootInstance

public final Object getRootInstance()

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

See Also:

• getNestedPath()

getRootClass

public final Class<?> getRootClass()

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

See Also:

• getNestedPath()

setPropertyValue

public void setPropertyValue(String propertyName,
 @Nullable 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:

BeansException

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:

BeansException

setPropertyValue

protected void setPropertyValue(AbstractNestablePropertyAccessor.PropertyTokenHolder tokens,
 PropertyValue pv)
                         throws BeansException

Throws:

BeansException

getPropertyType

public @Nullable 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:

BeansException

See Also:

• PropertyAccessor.getPropertyType(String)

getPropertyTypeDescriptor

public @Nullable TypeDescriptor getPropertyTypeDescriptor(String propertyName)
                                                   throws BeansException

Description copied from interface: PropertyAccessor

Return a type descriptor for the specified property: preferably from the read method, falling back to the write method.

Parameters:

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

Returns:

the property type for the particular property, or null if not determinable

Throws:

BeansException

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.

Parameters:

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

Returns:

whether the property is readable

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.

Parameters:

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

Returns:

whether the property is writable

convertForProperty

protected @Nullable Object convertForProperty(String propertyName,
 @Nullable Object oldValue,
 @Nullable Object newValue,
 TypeDescriptor td)
                                       throws TypeMismatchException

Throws:

TypeMismatchException

getPropertyValue

public @Nullable 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:

BeansException

getPropertyValue

protected @Nullable Object getPropertyValue(AbstractNestablePropertyAccessor.PropertyTokenHolder tokens)
                                     throws BeansException

Throws:

BeansException

getPropertyHandler

protected @Nullable AbstractNestablePropertyAccessor.PropertyHandler getPropertyHandler(String propertyName)
                                                                                 throws BeansException

Return the AbstractNestablePropertyAccessor.PropertyHandler for the specified propertyName, navigating if necessary. Return 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

getLocalPropertyHandler

protected abstract @Nullable AbstractNestablePropertyAccessor.PropertyHandler getLocalPropertyHandler(String propertyName)

Return a AbstractNestablePropertyAccessor.PropertyHandler for the specified local propertyName. Only used to reach a property available in the current context.

Parameters:

propertyName - the name of a local property

Returns:

the handler for that property, or null if it has not been found

newNestedPropertyAccessor

protected abstract AbstractNestablePropertyAccessor newNestedPropertyAccessor(Object object,
 String nestedPath)

Create a new nested property accessor instance. Can be overridden in subclasses to create a PropertyAccessor subclass.

Parameters:

object - the object wrapped by this PropertyAccessor

nestedPath - the nested path of the object

Returns:

the nested PropertyAccessor instance

createNotWritablePropertyException

protected abstract NotWritablePropertyException createNotWritablePropertyException(String propertyName)

Create a NotWritablePropertyException for the specified property.

getFinalPath

protected String getFinalPath(AbstractNestablePropertyAccessor pa,
 String nestedPath)

Get the last component of the path. Also works if not nested.

Parameters:

pa - property accessor to work on

nestedPath - property path we know is nested

Returns:

last component of the path (the property on the target bean)

getPropertyAccessorForPropertyPath

protected AbstractNestablePropertyAccessor getPropertyAccessorForPropertyPath(String propertyPath)

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

Parameters:

propertyPath - property path, which may be nested

Returns:

a property accessor for the target bean

toString

public String toString()

Overrides:

toString in class Object