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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) 2023, Sirix Contributors
 *
 * 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  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.node.xml;

import com.google.common.base.Objects;
import io.sirix.api.visitor.VisitResult;
import io.sirix.api.visitor.XmlNodeVisitor;
import io.sirix.node.NodeKind;
import io.sirix.node.SirixDeweyID;
import io.sirix.node.delegates.NodeDelegate;
import io.sirix.node.delegates.StructNodeDelegate;
import io.sirix.node.immutable.xml.ImmutableXmlDocumentRootNode;
import io.sirix.node.interfaces.StructNode;
import io.sirix.node.interfaces.immutable.ImmutableXmlNode;
import io.sirix.settings.Fixed;
import net.openhft.chronicle.bytes.Bytes;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;

import java.nio.ByteBuffer;

import static java.util.Objects.requireNonNull;

/**
 * Node representing the root of a document. This node is guaranteed to exist in revision 0 and can
 * not be removed.
 */
public final class XmlDocumentRootNode extends AbstractStructForwardingNode implements StructNode, ImmutableXmlNode {

  /**
   * {@link NodeDelegate} reference.
   */
  private final NodeDelegate nodeDelegate;

  /**
   * {@link StructNodeDelegate} reference.
   */
  private final StructNodeDelegate structNodeDelegate;

  private long hash;

  /**
   * Constructor.
   *
   * @param nodeDelegate       {@link NodeDelegate} reference
   * @param structNodeDelegate {@link StructNodeDelegate} reference
   */
  public XmlDocumentRootNode(final @NonNull NodeDelegate nodeDelegate,
      final @NonNull StructNodeDelegate structNodeDelegate) {
    this.nodeDelegate = requireNonNull(nodeDelegate);
    this.structNodeDelegate = requireNonNull(structNodeDelegate);
  }

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

  @Override
  public long computeHash(Bytes bytes) {
    final var nodeDelegate = structNodeDelegate.getNodeDelegate();

    bytes.clear();

    bytes.writeLong(nodeDelegate.getNodeKey())
         .writeLong(nodeDelegate.getParentKey())
         .writeByte(nodeDelegate.getKind().getId());

    bytes.writeLong(structNodeDelegate.getChildCount())
         .writeLong(structNodeDelegate.getDescendantCount())
         .writeLong(structNodeDelegate.getLeftSiblingKey())
         .writeLong(structNodeDelegate.getRightSiblingKey())
         .writeLong(structNodeDelegate.getFirstChildKey());

    if (structNodeDelegate.getLastChildKey() != Fixed.INVALID_KEY_FOR_TYPE_CHECK.getStandardProperty()) {
      bytes.writeLong(structNodeDelegate.getLastChildKey());
    }

    final var buffer = bytes.underlyingObject().rewind();
    buffer.limit((int) bytes.readLimit());

    return nodeDelegate.getHashFunction().hashBytes(buffer);
  }

  @Override
  public void setHash(final long hash) {
    this.hash = hash;
  }

  @Override
  public long getHash() {
    return hash;
  }

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

  @Override
  public int hashCode() {
    return Objects.hashCode(nodeDelegate);
  }

  @Override
  public boolean equals(@Nullable final Object obj) {
    if (obj instanceof final XmlDocumentRootNode other) {
      return Objects.equal(nodeDelegate, other.nodeDelegate);
    }
    return false;
  }

  @Override
  public @NonNull String toString() {
    return super.toString();
  }

  @Override
  protected @NonNull NodeDelegate delegate() {
    return nodeDelegate;
  }

  @Override
  protected StructNodeDelegate structDelegate() {
    return structNodeDelegate;
  }

  @Override
  public SirixDeweyID getDeweyID() {
    return nodeDelegate.getDeweyID();
  }

  @Override
  public int getTypeKey() {
    return nodeDelegate.getTypeKey();
  }

  @Override
  public byte[] getDeweyIDAsBytes() {
    return nodeDelegate.getDeweyIDAsBytes();
  }
}