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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 io.sirix.api.xml.XmlNodeReadOnlyTrx;
import io.sirix.api.xml.XmlNodeTrx;
import io.sirix.node.NodeKind;
import io.sirix.diff.DiffFactory.Builder;
import io.sirix.diff.DiffFactory.DiffType;

/**
 * Structural diff, thus no attributes and namespace nodes are taken into account.
 *
 * @author Johannes Lichtenberger, University of Konstanz
 *
 */
final class XmlStructuralDiff extends AbstractDiff {

  /**
   * Constructor.
   *
   * @param builder {@link Builder} reference
   */
  public XmlStructuralDiff(final Builder builder) {
    super(builder);
  }

  @Override
  NodeKind documentNode() {
    return NodeKind.XML_DOCUMENT;
  }

  @Override
  boolean checkNodes(final XmlNodeReadOnlyTrx newRtx, final XmlNodeReadOnlyTrx oldRtx) {
    boolean found = false;
    if (newRtx.getNodeKey() == oldRtx.getNodeKey() && newRtx.getParentKey() == oldRtx.getParentKey()
        && newRtx.getKind() == oldRtx.getKind()) {
      switch (newRtx.getKind()) {
        case ELEMENT:
          if (checkNamesForEquality(newRtx, oldRtx)) {
            found = true;
          }
          break;
        case PROCESSING_INSTRUCTION:
          found = newRtx.getValue().equals(oldRtx.getValue()) && checkNamesForEquality(newRtx, oldRtx);
          break;
        case COMMENT:
        case TEXT:
          if (newRtx.getValue().equals(oldRtx.getValue())) {
            found = true;
          }
          break;
        // $CASES-OMITTED$
        default:
          // Do nothing.
      }
    }
    return found;
  }

  @Override
  boolean checkNodeNamesOrValues(final XmlNodeReadOnlyTrx newRtx, final XmlNodeReadOnlyTrx oldRtx) {
    boolean found = false;
    if (newRtx.getKind() == oldRtx.getKind()) {
      switch (newRtx.getKind()) {
        case ELEMENT:
        case PROCESSING_INSTRUCTION:
          if (checkNamesForEquality(newRtx, oldRtx)) {
            found = true;
          }
          break;
        case TEXT:
        case COMMENT:
          if (newRtx.getValue().equals(oldRtx.getValue())) {
            found = true;
          }
          break;
        // $CASES-OMITTED$
        default:
      }
    }
    return found;
  }

  @Override
  void emitNonStructuralDiff(final XmlNodeReadOnlyTrx newRtx, final XmlNodeReadOnlyTrx oldRtx, final DiffDepth depth,
      final DiffType diff) {
  }

  protected boolean checkNamesForEquality(final XmlNodeReadOnlyTrx newRtx, final XmlNodeReadOnlyTrx oldRtx) {
    return newRtx.getURIKey() == oldRtx.getURIKey() && newRtx.getLocalNameKey() == oldRtx.getLocalNameKey()
        && newRtx.getPrefixKey() == oldRtx.getPrefixKey();
  }
}