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

# Class CompositeGuardingDynamicLinker

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

All Implemented Interfaces:
  `GuardingDynamicLinker`

public class CompositeGuardingDynamicLinker extends Object implements GuardingDynamicLinker
A `GuardingDynamicLinker` that delegates sequentially to a list of other guarding dynamic linkers in its `getGuardedInvocation(LinkRequest, LinkerServices)`.

## Constructor Summary

Constructors
Constructor
Description
`CompositeGuardingDynamicLinker(Iterable<? extends GuardingDynamicLinker> linkers)`
Creates a new composite linker.

## Method Summary

Modifier and Type
Method
Description
`GuardedInvocation`
`getGuardedInvocation(LinkRequest linkRequest, LinkerServices linkerServices)`
Delegates the call to its component linkers.

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

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

## Constructor Details

### CompositeGuardingDynamicLinker

public CompositeGuardingDynamicLinker(Iterable<? extends GuardingDynamicLinker> linkers)
Creates a new composite linker.

Parameters:
  `linkers` - a list of component linkers.
Throws:
  `NullPointerException` - if `linkers` or any of its elements are null.

## Method Details

### getGuardedInvocation

public GuardedInvocation getGuardedInvocation(LinkRequest linkRequest, LinkerServices linkerServices) throws Exception
Delegates the call to its component linkers. The first non-null value returned from a component linker is returned. If no component linker returns a non-null invocation, null is returned.

Specified by:
  `getGuardedInvocation` in interface `GuardingDynamicLinker`
Parameters:
  `linkRequest` - the object describing the request for linking a particular invocation
  `linkerServices` - linker services
Returns:
  the first non-null return value from a component linker, or null if none of the components returned a non-null.
Throws:
  `Exception` - if the operation fails for whatever reason