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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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/**
 * Copyright (c) 2011, University of Konstanz, Distributed Systems Group All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met: * Redistributions of source code must retain the
 * above copyright notice, this list of conditions and the following disclaimer. * Redistributions
 * in binary form must reproduce the above copyright notice, this list of conditions and the
 * following disclaimer in the documentation and/or other materials provided with the distribution.
 * * Neither the name of the University of Konstanz nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL  BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package io.sirix.diff;

import org.checkerframework.checker.index.qual.NonNegative;
import java.io.Serializable;

import static com.google.common.base.Preconditions.checkArgument;

/**
 * Immutable serializable diff depth container class to save the depth of the node in the old
 * revision and the depth of the node in the new revision.
 * 
 * @author Johannes Lichtenberger, University of Konstanz
 * 
 */
public final class DiffDepth implements Serializable {
  /**
   * Serial version UID.
   */
  private static final long serialVersionUID = 2657000076345449253L;

  /** Depth in new revision. */
  private final int newDepth;

  /** Depth in old revision. */
  private final int oldDepth;

  /**
   * Constructor.
   * 
   * @param newDepth current depth in new revision
   * @param oldDepth current depth in old revision
   */
  public DiffDepth(final @NonNegative int newDepth, final @NonNegative int oldDepth) {
    checkArgument(newDepth >= -1);
    checkArgument(oldDepth >= -1);
    this.newDepth = newDepth;
    this.oldDepth = oldDepth;
  }

  /**
   * Get depth in new revision.
   * 
   * @return depth in new revision
   */
  public int getNewDepth() {
    return newDepth;
  }

  /**
   * Get depth in old revision.
   * 
   * @return depth in old revision
   */
  public int getOldDepth() {
    return oldDepth;
  }
}