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.

Since:: 9

Constructor Summary

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 Object

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

Modifier and Type	Method	Description
`protected Object`	`clone()`	Creates and returns a copy of this object.
`boolean`	`equals(Object obj)`	Indicates whether some other object is "equal to" this one.
`protected void`	`finalize()`	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
`final Class<?>`	`getClass()`	Returns the runtime class of this `Object`.
`int`	`hashCode()`	Returns a hash code value for this object.
`final void`	`notify()`	Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()`	Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()`	Returns a string representation of the object.
`final void`	`wait()`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
`final void`	`wait(long timeoutMillis)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis, int nanos)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

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.

© 1993, 2025, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.