/**
 * 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 <COPYRIGHT HOLDER> 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 com.google.common.base.MoreObjects;

/**
 * Container for transaction cursor depths in both the old and new revision.
 *
 * @author Johannes Lichtenberger, University of Konstanz
 *
 */
final class DepthCounter {
  /** Depth in new revision. */
  private int mNewDepth;

  /** Depth in old revision. */
  private int mOldDepth;

  /**
   * Constructor.
   *
   * @param newDepth depth of transaction cursor in new revision
   * @param oldDepth depth of transaction cursor in old revision
   */
  DepthCounter(final int newDepth, final int oldDepth) {
    mNewDepth = newDepth;
    mOldDepth = oldDepth;
  }

  /** Increment depth in new revision. */
  void incrementNewDepth() {
    mNewDepth++;
  }

  /** Decrement depth in new revision. */
  void decrementNewDepth() {
    mNewDepth--;
  }

  /** Increment depth in old revision. */
  void incrementOldDepth() {
    mOldDepth++;
  }

  /** Decrement depth in old revision. */
  void decrementOldDepth() {
    mOldDepth--;
  }

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

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

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
                      .add("newDepth: ", mNewDepth)
                      .add("oldDepth: ", mOldDepth)
                      .toString();
  }
}
