Package jakarta.el
Class ELResolver
java.lang.Object
jakarta.el.ELResolver
- Direct Known Subclasses:
- ArrayELResolver,- BeanELResolver,- BeanNameELResolver,- CompositeELResolver,- ListELResolver,- MapELResolver,- ResourceBundleELResolver,- StaticFieldELResolver,- TypeConverter
- Author:
- Jacob Hookom [jacob/hookom.net]
- 
Field SummaryFields
- 
Constructor SummaryConstructors
- 
Method SummaryModifier and TypeMethodDescription<T> TconvertToType(ELContext context, Object obj, Class<T> type) Converts the given object to the given type.abstract Class<?>getCommonPropertyType(ELContext context, Object base) Obtain the most common type that is acceptable for the given base object.getFeatureDescriptors(ELContext context, Object base) Deprecated, for removal: This API element is subject to removal in a future version.This method will be removed, without replacement, in EL 6.0 / Tomcat 11.abstract Class<?>Obtain the most generally acceptable type that may be used to set the given property on the given object using the given context.abstract ObjectObtain the value of the given property on the given object using the given context.Invokes a method on the the given object.abstract booleanisReadOnly(ELContext context, Object base, Object property) Determine if the given property on the given object is read-only using the given context.abstract voidSet the value of the given property on the given object using the given context.
- 
Field Details- 
TYPE- See Also:
 
- 
RESOLVABLE_AT_DESIGN_TIME- See Also:
 
 
- 
- 
Constructor Details- 
ELResolverpublic ELResolver()
 
- 
- 
Method Details- 
getValueObtain the value of the given property on the given object using the given context.- 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
- Throws:
- NullPointerException- If the supplied context is- null
- PropertyNotFoundException- If the base/property combination provided to the resolver is one that the resolver can handle but no match was found or a match was found but was not readable
- ELException- Wraps any exception throw whilst resolving the property
 
- 
invokepublic Object invoke(ELContext context, Object base, Object method, Class<?>[] paramTypes, Object[] params) Invokes a method on the the given object.- Parameters:
- context- The EL context for this evaluation
- base- The base object on which the method is to be found
- method- The method to invoke
- paramTypes- The types of the parameters of the method to invoke
- params- The parameters with which to invoke the method
- Returns:
- This default implementation always returns null
- Since:
- EL 2.2
 
- 
getTypeObtain the most generally acceptable type that may be used to set the given property on the given object using the given context.- 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 nullif the resolver is read-only.
- Throws:
- NullPointerException- If the supplied context is- null
- PropertyNotFoundException- If the base/property combination provided to the resolver is one that the resolver can handle but no match was found or a match was found but was not readable
- ELException- Wraps any exception throw whilst resolving the property
 
- 
setValueSet the value of the given property on the given object using the given context.- 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
- Throws:
- NullPointerException- If the supplied context is- null
- PropertyNotFoundException- If the base/property combination provided to the resolver is one that the resolver can handle but no match was found
- PropertyNotWritableException- If the base/property combination provided to the resolver is one that the resolver can handle but the property was not writable
- ELException- Wraps any exception throw whilst resolving the property
 
- 
isReadOnlyDetermine if the given property on the given object is read-only using the given context.- 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:
- trueif the identified property is read only, otherwise- false
- Throws:
- NullPointerException- If the supplied context is- null
- PropertyNotFoundException- If the base/property combination provided to the resolver is one that the resolver can handle but no match was found
- ELException- Wraps any exception throw whilst resolving the property
 
- 
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.This method will be removed, without replacement, in EL 6.0 / Tomcat 11.Obtain the feature descriptors for the resolvable properties of the given object.The default implementation returns null.- 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
 
- 
getCommonPropertyTypeObtain the most common type that is acceptable for the given base object.- 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
 
- 
convertToTypeConverts the given object to the given type.- 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
- Since:
- EL 3.0
 
 
-