Package jakarta.el

Class TypeConverter

java.lang.Object

jakarta.el.ELResolver

jakarta.el.TypeConverter

public abstract class TypeConverter
extends ELResolver

Since:

EL 3.0

Field Summary

Fields inherited from class jakarta.el.ELResolver

RESOLVABLE_AT_DESIGN_TIME, TYPE

Constructor Summary

Constructors

Constructor	Description
TypeConverter()

Method Summary

Modifier and Type	Method	Description
abstract <T> T	convertToType(ELContext context, Object obj, Class<T> type)	Converts the given object to the given type.
Class<?>	getCommonPropertyType(ELContext context, Object base)	Obtain the most common type that is acceptable for the given base object.
Iterator<FeatureDescriptor>	getFeatureDescriptors(ELContext context, Object base)	Deprecated, for removal: This API element is subject to removal in a future version.
Class<?>	getType(ELContext context, Object base, Object property)	Obtain the most generally acceptable type that may be used to set the given property on the given object using the given context.
Object	getValue(ELContext context, Object base, Object property)	Obtain the value of the given property on the given object using the given context.
boolean	isReadOnly(ELContext context, Object base, Object property)	Determine if the given property on the given object is read-only using the given context.
void	setValue(ELContext context, Object base, Object property, Object value)	Set the value of the given property on the given object using the given context.

Methods inherited from class jakarta.el.ELResolver

invoke

Methods inherited from class java.lang.Object

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

Constructor Details

TypeConverter

public TypeConverter()

Method Details

getValue

public Object getValue(ELContext context,
 Object base,
 Object property)

Description copied from class: ELResolver

Obtain the value of the given property on the given object using the given context.

Specified by:

getValue in class ELResolver

Parameters:

context - The EL context for this evaluation

base - The base object on which the property is to be found

property - The property whose value is to be returned

Returns:

the value of the provided property

getType

public Class<?> getType(ELContext context,
 Object base,
 Object property)

Description copied from class: ELResolver

Obtain the most generally acceptable type that may be used to set the given property on the given object using the given context.

Specified by:

getType in class ELResolver

Parameters:

context - The EL context for this evaluation

base - The base object on which the property is to be found

property - The property whose type is to be returned

Returns:

the most general type that maybe used to set the provided property or null if the resolver is read-only.

setValue

public void setValue(ELContext context,
 Object base,
 Object property,
 Object value)

Description copied from class: ELResolver

Set the value of the given property on the given object using the given context.

Specified by:

setValue in class ELResolver

Parameters:

context - The EL context for this evaluation

base - The base object on which the property is to be found

property - The property whose value is to be set

value - The value to set the property to

isReadOnly

public boolean isReadOnly(ELContext context,
 Object base,
 Object property)

Description copied from class: ELResolver

Determine if the given property on the given object is read-only using the given context.

Specified by:

isReadOnly in class ELResolver

Parameters:

context - The EL context for this evaluation

base - The base object on which the property is to be found

property - The property to be checked for read only status

Returns:

true if the identified property is read only, otherwise false

getFeatureDescriptors

@Deprecated(forRemoval=true,
            since="EL 5.0")
public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context,
 Object base)

Deprecated, for removal: This API element is subject to removal in a future version.

Description copied from class: ELResolver

Obtain the feature descriptors for the resolvable properties of the given object.

The default implementation returns null.

Overrides:

getFeatureDescriptors in class ELResolver

Parameters:

context - The context in which the examination takes place

base - The object to examine

Returns:

An iterator, possibly empty, of feature descriptors of the given object

getCommonPropertyType

public Class<?> getCommonPropertyType(ELContext context,
 Object base)

Description copied from class: ELResolver

Obtain the most common type that is acceptable for the given base object.

Specified by:

getCommonPropertyType in class ELResolver

Parameters:

context - The context in which the examination takes place

base - The object to examine

Returns:

{code null} if the most common type cannot be determine, otherwise the most common type

convertToType

public abstract <T> T convertToType(ELContext context,
 Object obj,
 Class<T> type)

Description copied from class: ELResolver

Converts the given object to the given type.

Overrides:

convertToType in class ELResolver

Type Parameters:

T - The type to which the object should be converted

Parameters:

context - The EL context for this evaluation

obj - The object to convert

type - The type to which the object should be converted

Returns:

This default implementation always returns null