DefaultInternalObjectFilter (Java SE 21 & JDK 21)
Description: declaration: module: jdk.dynalink, package: jdk.dynalink.linker.support, class: DefaultInternalObjectFilter
Keywords: jdk.dynalink.linker.support.DefaultInternalObjectFilter class

Module jdk.dynalink
Package jdk.dynalink.linker.support

# Class DefaultInternalObjectFilter

java.lang.Object
jdk.dynalink.linker.support.DefaultInternalObjectFilter

All Implemented Interfaces:
  `MethodHandleTransformer`

public class DefaultInternalObjectFilter extends Object implements MethodHandleTransformer
Default implementation for a `DynamicLinkerFactory.setInternalObjectsFilter(MethodHandleTransformer)` that delegates to a pair of filtering method handles. It takes a method handle of `Object(Object)` type for filtering parameter values and another one of the same type for filtering return values. It applies them as parameter and return value filters on method handles passed to its `transform(MethodHandle)` method, on those parameters and return values that are declared to have type `Object`. Also handles `method handles that support variable arity calls` with a last `Object[]` parameter. You can broadly think of the parameter filter as being a wrapping method for exposing internal runtime objects wrapped into an adapter with some public interface, and the return value filter as being its inverse unwrapping method.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `DefaultInternalObjectFilter(MethodHandle parameterFilter, MethodHandle returnFilter)`
  Creates a new filter.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `MethodHandle`
  `transform(MethodHandle target)`
  Transforms a method handle.

  ### Methods declared in class java.lang.Object

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

- ## Constructor Details

  - ### DefaultInternalObjectFilter

    public DefaultInternalObjectFilter(MethodHandle parameterFilter, MethodHandle returnFilter)
    Creates a new filter.
    Parameters:
      `parameterFilter` - the filter for method parameters. Must be of type `Object(Object)`, or `null`.
      `returnFilter` - the filter for return values. Must be of type `Object(Object)`, or `null`.
    Throws:
      `IllegalArgumentException` - if one or both filters are not of the expected type.

- ## Method Details

  - ### transform

    public MethodHandle transform(MethodHandle target)
    Description copied from interface: `MethodHandleTransformer`
    Transforms a method handle.
    Specified by:
      `transform` in interface `MethodHandleTransformer`
    Parameters:
      `target` - the method handle being transformed.
    Returns:
      transformed method handle.