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SirixDB is a hybrid on-disk and in-memory document oriented, versioned database system. It has a lightweight buffer manager, stores everything in a huge persistent and durable tree and allows efficient reconstruction of every revision. Furthermore, SirixDB implements change tracking, diffing and supports time travel queries.

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package io.sirix.node.immutable.json;

import io.sirix.api.visitor.JsonNodeVisitor;
import io.sirix.api.visitor.VisitResult;
import io.sirix.node.NodeKind;
import io.sirix.node.interfaces.StructNode;
import io.sirix.node.xml.ElementNode;
import net.openhft.chronicle.bytes.Bytes;
import io.sirix.node.json.NullNode;

import java.nio.ByteBuffer;

import static java.util.Objects.requireNonNull;

/**
 * Immutable element wrapper.
 *
 * @author Johannes Lichtenberger
 *
 */
public final class ImmutableNullNode extends AbstractImmutableJsonStructuralNode {

  /** Mutable {@link NullNode}. */
  private final NullNode node;

  /**
   * Private constructor.
   *
   * @param node mutable {@link ElementNode}
   */
  private ImmutableNullNode(final NullNode node) {
    this.node = requireNonNull(node);
  }

  /**
   * Get an immutable JSON-array node instance.
   *
   * @param node the mutable {@link ImmutableNullNode} to wrap
   * @return immutable JSON-array node instance
   */
  public static ImmutableNullNode of(final NullNode node) {
    return new ImmutableNullNode(node);
  }

  @Override
  public VisitResult acceptVisitor(final JsonNodeVisitor visitor) {
    return visitor.visit(this);
  }

  @Override
  public StructNode structDelegate() {
    return node;
  }

  @Override
  public NodeKind getKind() {
    return NodeKind.NULL_VALUE;
  }

  @Override
  public long computeHash(Bytes bytes) {
    return node.computeHash(bytes);
  }
}