import org.gradle.internal.snapshot.ValueSnapshotter;

import javax.annotation.Nullable;

public class NullValueSnapshot implements ValueSnapshot, Isolatable<Object> {
    public static final NullValueSnapshot INSTANCE = new NullValueSnapshot();

    private NullValueSnapshot() {
    }

    @Override
    public ValueSnapshot snapshot(@Nullable Object value, ValueSnapshotter snapshotter) {

import org.gradle.internal.snapshot.impl.NullValueSnapshot
import org.gradle.internal.snapshot.impl.StringValueSnapshot
import org.gradle.internal.state.Managed
import org.gradle.internal.state.ManagedFactoryRegistry


object NullValueSnapshotCodec : Codec<NullValueSnapshot> {
    override suspend fun WriteContext.encode(value: NullValueSnapshot) {
    }

        @Override
        protected void serialize(Encoder encoder, NullValueSnapshot value) {
        }

        @Override
        protected NullValueSnapshot deserialize(Decoder decoder) {
            return NullValueSnapshot.INSTANCE;
        }

        @Override
        public Class<NullValueSnapshot> getIsolatableClass() {

        int type = decoder.readSmallInt();
        int size;
        String className;
        switch (type) {
            case NULL_SNAPSHOT:
                return NullValueSnapshot.INSTANCE;
            case TRUE_SNAPSHOT:
                return BooleanValueSnapshot.TRUE;
            case FALSE_SNAPSHOT:
                return BooleanValueSnapshot.FALSE;
            case STRING_SNAPSHOT:

        write(original)

        expect:
        original == written
    }

    def "serializes null properties"() {
        def original = NullValueSnapshot.INSTANCE
        write(original)

        expect:
        original == written
    }

    def "serializes boolean properties"() {
        write(value)

        expect:

            this.classLoaderHasher = classLoaderHasher;
        }

        @Override
        public ValueSnapshot nullValue() {
            return NullValueSnapshot.INSTANCE;
        }

        @Override
        public ValueSnapshot stringValue(String value) {
            return new StringValueSnapshot(value);
        }

        @Override

            this.classLoaderHasher = classLoaderHasher;
            this.managedFactoryRegistry = managedFactoryRegistry;
        }

        @Override
        public Isolatable<?> nullValue() {
            return NullValueSnapshot.INSTANCE;
        }

        @Override
        public Isolatable<?> stringValue(String value) {
            return new StringValueSnapshot(value);
        }

        @Override

        snapshotter.snapshot(false) != snapshotter.snapshot(isolated)
    }

    def "creates snapshot for null value"() {
        expect:
        snapshotter.snapshot(null).is NullValueSnapshot.INSTANCE
    }

    def "creates snapshot for isolated null value"() {
        expect:
        def isolated = isolatableFactory.isolate(null)
        snapshotter.snapshot(null) == snapshotter.snapshot(isolated)