53 lines
1.5 KiB
Java
53 lines
1.5 KiB
Java
package it.cavallium.dbengine.database.collections;
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import io.netty.buffer.api.Buffer;
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import it.cavallium.dbengine.database.LLDictionary;
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import it.cavallium.dbengine.database.serialization.Serializer;
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import java.util.function.Function;
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import org.jetbrains.annotations.NotNull;
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import static io.netty.buffer.Unpooled.*;
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public class DatabaseEmpty {
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@SuppressWarnings({"unused", "InstantiationOfUtilityClass"})
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public static final Nothing NOTHING = new Nothing();
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public static final Serializer<Nothing, Buffer> NOTHING_SERIALIZER = new Serializer<>() {
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@Override
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public @NotNull Nothing deserialize(@NotNull Buffer serialized) {
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try {
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return NOTHING;
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} finally {
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serialized.release();
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}
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}
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@Override
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public @NotNull Buffer serialize(@NotNull Nothing deserialized) {
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return EMPTY_BUFFER;
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}
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};
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public static final Function<Nothing, Nothing> NOTHING_HASH_FUNCTION = nothing -> nothing;
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private static final SubStageGetter<Nothing, DatabaseStageEntry<Nothing>> NOTHING_SUB_STAGE_GETTER
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= new SubStageGetterSingle<>(NOTHING_SERIALIZER);
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private DatabaseEmpty() {
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}
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public static DatabaseStageEntry<Nothing> create(LLDictionary dictionary, Buffer key) {
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return new DatabaseSingle<>(dictionary, key, NOTHING_SERIALIZER);
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}
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public static SubStageGetter<Nothing, DatabaseStageEntry<Nothing>> createSubStageGetter() {
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return NOTHING_SUB_STAGE_GETTER;
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}
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public static final class Nothing {
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@SuppressWarnings("InstantiationOfUtilityClass")
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public static Nothing INSTANCE = new Nothing();
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private Nothing() {
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}
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}
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} |