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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.
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// CheckStyle: start generated
package com.oracle.truffle.polyglot;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.GeneratedBy;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.library.DynamicDispatchLibrary;
import com.oracle.truffle.api.library.LibraryExport;
import com.oracle.truffle.api.library.LibraryFactory;
import com.oracle.truffle.api.nodes.NodeCost;
import com.oracle.truffle.polyglot.DefaultScope.NullValue;

@GeneratedBy(NullValue.class)
final class NullValueGen {

    private static final LibraryFactory DYNAMIC_DISPATCH_LIBRARY_ = LibraryFactory.resolve(DynamicDispatchLibrary.class);

    static  {
        LibraryExport.register(NullValue.class, new InteropLibraryExports());
    }

    private NullValueGen() {
    }

    @GeneratedBy(NullValue.class)
    private static final class InteropLibraryExports extends LibraryExport {

        private static final Uncached UNCACHED = new Uncached();
        private static final Cached CACHE = new Cached();

        private InteropLibraryExports() {
            super(InteropLibrary.class, NullValue.class, false, false, 0);
        }

        @Override
        protected InteropLibrary createUncached(Object receiver) {
            assert receiver instanceof NullValue;
            InteropLibrary uncached = InteropLibraryExports.UNCACHED;
            return uncached;
        }

        @Override
        protected InteropLibrary createCached(Object receiver) {
            assert receiver instanceof NullValue;
            return InteropLibraryExports.CACHE;
        }

        @GeneratedBy(NullValue.class)
        private static final class Cached extends InteropLibrary {

            protected Cached() {
            }

            @Override
            public boolean accepts(Object receiver) {
                assert !(receiver instanceof NullValue) || DYNAMIC_DISPATCH_LIBRARY_.getUncached().dispatch(receiver) == null : "Invalid library export. Exported receiver with dynamic dispatch found but not expected.";
                return receiver instanceof NullValue;
            }

            @Override
            public boolean isAdoptable() {
                return false;
            }

            @Override
            public boolean isNull(Object receiver) {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (((NullValue) receiver)).isNull();
            }

        }
        @GeneratedBy(NullValue.class)
        private static final class Uncached extends InteropLibrary {

            protected Uncached() {
            }

            @Override
            @TruffleBoundary
            public boolean accepts(Object receiver) {
                assert !(receiver instanceof NullValue) || DYNAMIC_DISPATCH_LIBRARY_.getUncached().dispatch(receiver) == null : "Invalid library export. Exported receiver with dynamic dispatch found but not expected.";
                return receiver instanceof NullValue;
            }

            @Override
            public boolean isAdoptable() {
                return false;
            }

            @Override
            public NodeCost getCost() {
                return NodeCost.MEGAMORPHIC;
            }

            @TruffleBoundary
            @Override
            public boolean isNull(Object receiver) {
                // declared: true
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return ((NullValue) receiver) .isNull();
            }

        }
    }
}