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]
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Field Summary
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Constructor Summary
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Method Summary
Modifier 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.abstract Class<?>Obtain the type of 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.
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Field Details
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TYPE
- See Also:
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RESOLVABLE_AT_DESIGN_TIME
- See Also:
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Constructor Details
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ELResolver
public ELResolver()
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Method Details
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getValue
Obtain the value of the given property on the given object using the given context.- Parameters:
context- The EL context for this evaluationbase- The base object on which the property is to be foundproperty- The property whose value is to be returned- Returns:
- the value of the provided property
- Throws:
NullPointerException- If the supplied context isnullPropertyNotFoundException- 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 readableELException- Wraps any exception throw whilst resolving the property
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invoke
public Object invoke(ELContext context, Object base, Object method, Class<?>[] paramTypes, Object[] params) Invokes a method on the the given object. This default implementation always returnsnull.- Parameters:
context- The EL context for this evaluationbase- The base object on which the method is to be foundmethod- The method to invokeparamTypes- The types of the parameters of the method to invokeparams- The parameters with which to invoke the method- Returns:
- Always
null - Since:
- EL 2.2
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getType
Obtain the type of the given property on the given object using the given context.- Parameters:
context- The EL context for this evaluationbase- The base object on which the property is to be foundproperty- The property whose type is to be returned- Returns:
- the type of the provided property
- Throws:
NullPointerException- If the supplied context isnullPropertyNotFoundException- 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 readableELException- Wraps any exception throw whilst resolving the property
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setValue
Set the value of the given property on the given object using the given context.- Parameters:
context- The EL context for this evaluationbase- The base object on which the property is to be foundproperty- The property whose value is to be setvalue- The value to set the property to- Throws:
NullPointerException- If the supplied context isnullPropertyNotFoundException- If the base/property combination provided to the resolver is one that the resolver can handle but no match was foundPropertyNotWritableException- If the base/property combination provided to the resolver is one that the resolver can handle but the property was not writableELException- Wraps any exception throw whilst resolving the property
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isReadOnly
Determine if the given property on the given object is read-only using the given context.- Parameters:
context- The EL context for this evaluationbase- The base object on which the property is to be foundproperty- The property to be checked for read only status- Returns:
trueif the identified property is read only, otherwisefalse- Throws:
NullPointerException- If the supplied context isnullPropertyNotFoundException- If the base/property combination provided to the resolver is one that the resolver can handle but no match was foundELException- Wraps any exception throw whilst resolving the property
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getCommonPropertyType
Obtain the most common type that is acceptable for the given base object.- Parameters:
context- The context in which the examination takes placebase- The object to examine- Returns:
- {code null} if the most common type cannot be determine, otherwise the most common type
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convertToType
Converts the given object to the given type. This default implementation always returnsnull.- Type Parameters:
T- The type to which the object should be converted- Parameters:
context- The EL context for this evaluationobj- The object to converttype- The type to which the object should be converted- Returns:
- Always
null - Since:
- EL 3.0
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