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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 org.sirix.api;

import static com.google.common.base.Preconditions.checkNotNull;
import org.checkerframework.checker.nullness.qual.Nullable;

import com.google.common.base.MoreObjects;

/**
 * Determines that a {@link NodeCursor} has been moved.
 *
 * @author Johannes Lichtenberger
 *
 * @param  the cursor instance
 */
public final class Moved extends Move {

  /** {@link NodeCursor} implementation. */
  private final T nodeCursor;

  /**
   * Constructor.
   *
   * @param nodeCursor the cursor which has been moved
   */
  public Moved(final T nodeCursor) {
    this.nodeCursor = checkNotNull(nodeCursor);
  }

  @Override
  public boolean hasMoved() {
    return true;
  }

  @Override
  public T trx() {
    return nodeCursor;
  }

  @Override
  public boolean equals(final @Nullable Object object) {
    if (this == object)
      return true;

    if (!(object instanceof Moved))
      return false;

    final Moved other = (Moved) object;
    return nodeCursor.equals(other.nodeCursor);
  }

  @Override
  public int hashCode() {
    return 0x598df91c + nodeCursor.hashCode();
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this).add("cursor", nodeCursor).toString();
  }
}