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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;
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package io.sirix.node.json;

import io.sirix.node.delegates.NodeDelegate;
import io.sirix.node.delegates.StructNodeDelegate;
import io.sirix.node.interfaces.immutable.ImmutableJsonNode;
import io.sirix.settings.Fixed;
import net.openhft.chronicle.bytes.Bytes;
import io.sirix.node.xml.AbstractStructForwardingNode;
import org.checkerframework.checker.nullness.qual.NonNull;

import java.nio.ByteBuffer;

public abstract class AbstractNullNode extends AbstractStructForwardingNode implements ImmutableJsonNode {
  private final StructNodeDelegate structNodeDelegate;

  private long hashCode;

  public AbstractNullNode(StructNodeDelegate mStructNodeDel) {
    this.structNodeDelegate = mStructNodeDel;
  }

  @Override
  public long computeHash(final 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) {
    hashCode = hash;
  }

  @Override
  public long getHash() {
    if (hashCode == 0L) {
      hashCode = computeHash(Bytes.elasticHeapByteBuffer());
    }
    return hashCode;
  }

  @Override
  protected @NonNull NodeDelegate delegate() {
    return structNodeDelegate.getNodeDelegate();
  }

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