Package javax.el

Class ELResolver

    • Constructor Summary

      Constructors 
      Constructor Description
      ELResolver()  
    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.Object convertToType​(ELContext context, java.lang.Object obj, java.lang.Class<?> type)
      Converts the given object to the given type.
      abstract java.lang.Class<?> getCommonPropertyType​(ELContext context, java.lang.Object base)
      Obtain the most common type that is acceptable for the given base object.
      abstract java.util.Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors​(ELContext context, java.lang.Object base)
      Obtain the feature descriptors for the resolvable properties of the given object.
      abstract java.lang.Class<?> getType​(ELContext context, java.lang.Object base, java.lang.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.
      abstract java.lang.Object getValue​(ELContext context, java.lang.Object base, java.lang.Object property)
      Obtain the value of the given property on the given object using the given context.
      java.lang.Object invoke​(ELContext context, java.lang.Object base, java.lang.Object method, java.lang.Class<?>[] paramTypes, java.lang.Object[] params)
      Invokes a method on the the given object.
      abstract boolean isReadOnly​(ELContext context, java.lang.Object base, java.lang.Object property)
      Determine if the given property on the given object is read-only using the given context.
      abstract void setValue​(ELContext context, java.lang.Object base, java.lang.Object property, java.lang.Object value)
      Set the value of the given property on the given object using the given context.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • ELResolver

        public ELResolver()
    • Method Detail

      • getValue

        public abstract java.lang.Object getValue​(ELContext context,
                                                  java.lang.Object base,
                                                  java.lang.Object property)
        Obtain 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:
        java.lang.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
      • invoke

        public java.lang.Object invoke​(ELContext context,
                                       java.lang.Object base,
                                       java.lang.Object method,
                                       java.lang.Class<?>[] paramTypes,
                                       java.lang.Object[] params)
        Invokes a method on the the given object. This default implementation always returns null.
        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:
        Always null
        Since:
        EL 2.2
      • getType

        public abstract java.lang.Class<?> getType​(ELContext context,
                                                   java.lang.Object base,
                                                   java.lang.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.
        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.
        Throws:
        java.lang.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
      • setValue

        public abstract void setValue​(ELContext context,
                                      java.lang.Object base,
                                      java.lang.Object property,
                                      java.lang.Object value)
        Set 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:
        java.lang.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
      • isReadOnly

        public abstract boolean isReadOnly​(ELContext context,
                                           java.lang.Object base,
                                           java.lang.Object property)
        Determine 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:
        true if the identified property is read only, otherwise false
        Throws:
        java.lang.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

        public abstract java.util.Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors​(ELContext context,
                                                                                               java.lang.Object base)
        Obtain the feature descriptors for the resolvable properties of the given object.
        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 abstract java.lang.Class<?> getCommonPropertyType​(ELContext context,
                                                                 java.lang.Object base)
        Obtain 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
      • convertToType

        public java.lang.Object convertToType​(ELContext context,
                                              java.lang.Object obj,
                                              java.lang.Class<?> type)
        Converts the given object to the given type. This default implementation always returns null.
        Parameters:
        context - The EL context for this evaluation
        obj - The object to convert
        type - The type to which the object should be converted
        Returns:
        Always null
        Since:
        EL 3.0