Package net.bytebuddy.dynamic.loading

Class ClassInjector.UsingLookup

  • All Implemented Interfaces:
    ClassInjector
    Enclosing interface:
    ClassInjector
    @Enhance
public static class ClassInjector.UsingLookup
extends ClassInjector.AbstractBase

    A class injector that uses a java.lang.invoke.MethodHandles$Lookup object for defining a class.

    Important: This functionality is only available starting from Java 9.

    • Field Detail

      • PACKAGE_LOOKUP

        private static final int PACKAGE_LOOKUP
        Indicates a lookup instance's package lookup mode.
        See Also:
        Constant Field Values

      • lookup

        private final java.lang.Object lookup
        The java.lang.invoke.MethodHandles$Lookup to use.

    • Constructor Detail

      • UsingLookup

        protected UsingLookup​(java.lang.Object lookup)
        Creates a new class injector using a lookup instance.
        Parameters:
        lookup - The java.lang.invoke.MethodHandles$Lookup instance to use.

    • Method Detail

      • doPrivileged

        @Enhance
private static <T> T doPrivileged​(java.security.PrivilegedAction<T> action)
        A proxy for java.security.AccessController#doPrivileged that is activated if available.
        Type Parameters:
        T - The type of the action's resolved value.
        Parameters:
        action - The action to execute from a privileged context.
        Returns:
        The action's resolved value.

      • of

        public static ClassInjector.UsingLookup of​(java.lang.Object lookup)
        Creates class injector that defines a class using a method handle lookup.
        Parameters:
        lookup - The java.lang.invoke.MethodHandles$Lookup instance to use.
        Returns:
        An appropriate class injector.

      • lookupType

        public java.lang.Class<?> lookupType()
        Returns the lookup type this injector is based upon.
        Returns:
        The lookup type.

      • in

        public ClassInjector.UsingLookup in​(java.lang.Class<?> type)
        Resolves this injector to use the supplied type's scope.
        Parameters:
        type - The type to resolve the access scope for.
        Returns:
        An new injector with the specified scope.

      • isAlive

        public boolean isAlive()
        Indicates if this class injector is available on the current VM.
        Returns:
        true if this injector is available on the current VM.

      • injectRaw

        public java.util.Map<java.lang.String,​java.lang.Class<?>> injectRaw​(java.util.Set<java.lang.String> names,
                                                                          ClassFileLocator classFileLocator)
        Injects the given types into the represented class loader.
        Parameters:
        names - The names of the types to load via injection.
        classFileLocator - The class file locator to use for resolving binary representations.
        Returns:
        The loaded types that were passed as arguments.

      • isAvailable

        public static boolean isAvailable()
        Checks if the current VM is capable of defining classes using a method handle lookup.
        Returns:
        true if the current VM is capable of defining classes using a lookup.