JasperELResolver (Apache Tomcat 8.5.57 API Documentation)

org.apache.jasper.el

## Class JasperELResolver

- java.lang.Object
- - javax.el.ELResolver
  - - javax.el.CompositeELResolver
    - - org.apache.jasper.el.JasperELResolver

-     public class JasperELResolver
      extends CompositeELResolver

  Jasper-specific CompositeELResolver that optimizes certain functions to avoid unnecessary resolver calls.

- - ### Field Summary

    - ### Fields inherited from class javax.el.ELResolver

      `RESOLVABLE_AT_DESIGN_TIME, TYPE`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `JasperELResolver(List<ELResolver> appResolvers, ELResolver streamResolver)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `add(ELResolver elResolver)`
    `Object` | `getValue(ELContext context, Object base, Object property)`
    `Object` | `invoke(ELContext context, Object base, Object method, Class<?>[] paramTypes, Object[] params)` Invokes a method on the the given object.

    - ### Methods inherited from class javax.el.CompositeELResolver

      `convertToType, getCommonPropertyType, getFeatureDescriptors, getType, isReadOnly, setValue`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### JasperELResolver

          public JasperELResolver(List<ELResolver> appResolvers,
                          ELResolver streamResolver)

  - ### Method Detail

    - #### add

          public void add(ELResolver elResolver)

      Overrides:
        `add` in class `CompositeELResolver`

    - #### getValue

          public Object getValue(ELContext context,
                        Object base,
                        Object property)
                          throws NullPointerException,
                                 PropertyNotFoundException,
                                 ELException

      Overrides:
        `getValue` in class `CompositeELResolver`
      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

    - #### invoke

          public Object invoke(ELContext context,
                      Object base,
                      Object method,
                      Class<?>[] paramTypes,
                      Object[] params)

      Description copied from class: `javax.el.ELResolver`
      Invokes a method on the the given object. This default implementation always returns `null`.
      Overrides:
        `invoke` in class `CompositeELResolver`
      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`

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