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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;
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.interop.InvalidArrayIndexException;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
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.LegacyScopesBridge.EmptyKeys;

@GeneratedBy(EmptyKeys.class)
final class EmptyKeysGen {

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

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

    private EmptyKeysGen() {
    }

    @GeneratedBy(EmptyKeys.class)
    static class InteropLibraryExports extends LibraryExport {

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

        @Override
        protected InteropLibrary createUncached(Object receiver) {
            assert receiver instanceof EmptyKeys;
            InteropLibrary uncached = new Uncached(receiver);
            return uncached;
        }

        @Override
        protected InteropLibrary createCached(Object receiver) {
            assert receiver instanceof EmptyKeys;
            return new Cached(receiver);
        }

        @GeneratedBy(EmptyKeys.class)
        static class Cached extends InteropLibrary {

            private final Class receiverClass_;

            protected Cached(Object receiver) {
                EmptyKeys castReceiver = ((EmptyKeys) receiver) ;
                this.receiverClass_ = castReceiver.getClass();
            }

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

            @Override
            public boolean hasArrayElements(Object receiver) {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).hasArrayElements();
            }

            @Override
            public long getArraySize(Object receiver) throws UnsupportedMessageException {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).getArraySize();
            }

            @Override
            public boolean isArrayElementReadable(Object receiver, long index) {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).isArrayElementReadable(index);
            }

            @Override
            public Object readArrayElement(Object receiver, long index) throws UnsupportedMessageException, InvalidArrayIndexException {
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return (CompilerDirectives.castExact(receiver, receiverClass_)).readArrayElement(index);
            }

        }
        @GeneratedBy(EmptyKeys.class)
        static class Uncached extends InteropLibrary {

            private final Class receiverClass_;

            protected Uncached(Object receiver) {
                this.receiverClass_ = ((EmptyKeys) receiver).getClass();
            }

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

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

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

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

            @TruffleBoundary
            @Override
            public long getArraySize(Object receiver) throws UnsupportedMessageException {
                // declared: true
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return ((EmptyKeys) receiver) .getArraySize();
            }

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

            @TruffleBoundary
            @Override
            public Object readArrayElement(Object receiver, long index) throws UnsupportedMessageException, InvalidArrayIndexException {
                // declared: true
                assert this.accepts(receiver) : "Invalid library usage. Library does not accept given receiver.";
                return ((EmptyKeys) receiver) .readArrayElement(index);
            }

        }
    }
}