How to use

getPageChunkId

method

in

org.h2.mvstore.DataUtils

/**
 * Only keep one reference to the same chunk. Only leaf references are
 * removed (references to inner nodes are not removed, as they could
 * indirectly point to other chunks).
 */
void removeDuplicateChunkReferences() {
  HashSet<Integer> chunks = new HashSet<>();
  // we don't need references to leaves in the same chunk
  chunks.add(DataUtils.getPageChunkId(pos));
  for (int i = 0; i < children.length; i++) {
    long p = children[i];
    int chunkId = DataUtils.getPageChunkId(p);
    boolean wasNew = chunks.add(chunkId);
    if (DataUtils.getPageType(p) == DataUtils.PAGE_TYPE_NODE) {
      continue;
    }
    if (wasNew) {
      continue;
    }
    removeChild(i--);
  }
}

@Override
public String toString() {
  StringBuilder buff = new StringBuilder();
  buff.append("id: ").append(System.identityHashCode(this)).append('\n');
  buff.append("version: ").append(Long.toHexString(version)).append('\n');
  buff.append("pos: ").append(Long.toHexString(pos)).append('\n');
  if (pos != 0) {
    int chunkId = DataUtils.getPageChunkId(pos);
    buff.append("chunk: ").append(Long.toHexString(chunkId)).append('\n');
  }
  for (int i = 0; i <= keys.length; i++) {
    if (i > 0) {
      buff.append(" ");
    }
    if (children != null) {
      buff.append('[').append(Long.toHexString(children[i].pos)).append("] ");
    }
    if (i < keys.length) {
      buff.append(keys[i]);
      if (values != null) {
        buff.append(':');
        buff.append(values[i]);
      }
    }
  }
  return buff.toString();
}

/**
 * Get the chunk for the given position.
 *
 * @param pos the position
 * @return the chunk
 */
private Chunk getChunk(long pos) {
  Chunk c = getChunkIfFound(pos);
  if (c == null) {
    int chunkId = DataUtils.getPageChunkId(pos);
    throw DataUtils.newIllegalStateException(
        DataUtils.ERROR_FILE_CORRUPT,
        "Chunk {0} not found", chunkId);
  }
  return c;
}

private void collectReferencedChunks(Set<Integer> targetChunkSet,
    int mapId, long pos, int level) {
  int c = DataUtils.getPageChunkId(pos);
  targetChunkSet.add(c);
  if (DataUtils.getPageType(pos) == DataUtils.PAGE_TYPE_LEAF) {
    targetChunkSet.add(DataUtils.getPageChunkId(p));

private Chunk getChunkIfFound(long pos) {
  int chunkId = DataUtils.getPageChunkId(pos);
  Chunk c = chunks.get(chunkId);
  if (c == null) {
    checkOpen();
    if (!Thread.holdsLock(this)) {
      // it could also be unsynchronized metadata
      // access (if synchronization on this was forgotten)
      throw DataUtils.newIllegalStateException(
          DataUtils.ERROR_CHUNK_NOT_FOUND,
          "Chunk {0} no longer exists",
          chunkId);
    }
    String s = meta.get(Chunk.getMetaKey(chunkId));
    if (s == null) {
      return null;
    }
    c = Chunk.fromString(s);
    if (c.block == Long.MAX_VALUE) {
      throw DataUtils.newIllegalStateException(
          DataUtils.ERROR_FILE_CORRUPT,
          "Chunk {0} is invalid", chunkId);
    }
    chunks.put(c.id, c);
  }
  return c;
}

        counts[i],
        keys[i],
        DataUtils.getPageChunkId(cp),
        DataUtils.getPageOffset(cp));
      counts[entries],
      keys.length >= entries ? null : keys[entries],
      DataUtils.getPageChunkId(cp),
      DataUtils.getPageOffset(cp));
} else {
        len + "x%n",
        counts[i],
        DataUtils.getPageChunkId(cp),
        DataUtils.getPageOffset(cp));

Page p = new Page(map, 0);
p.pos = pos;
int chunkId = DataUtils.getPageChunkId(pos);
int offset = DataUtils.getPageOffset(pos);
p.read(buff, chunkId, offset, maxLength);

int chunkId = DataUtils.getPageChunkId(pos);
int offset = DataUtils.getPageOffset(pos);
int start = buff.position();

private int rewrite(Page p, Set<Integer> set) {
  if (p.isLeaf()) {
    long pos = p.getPos();
    int chunkId = DataUtils.getPageChunkId(pos);
    if (!set.contains(chunkId)) {
      return 0;
      int chunkId = DataUtils.getPageChunkId(childPos);
      if (!set.contains(chunkId)) {
        continue;
    int chunkId = DataUtils.getPageChunkId(pos);
    if (set.contains(chunkId)) {

int chunk = DataUtils.getPageChunkId(pos);
if (chunk == parentChunk) {
  return null;

/**
 * Collect the set of chunks referenced directly by this page.
 *
 * @param target the target set
 */
void collectReferencedChunks(Set<Integer> target) {
  target.add(DataUtils.getPageChunkId(pos));
  for (long p : children) {
    target.add(DataUtils.getPageChunkId(p));
  }
}

/**
 * Collect the set of chunks referenced directly by this page.
 *
 * @param target the target set
 */
void collectReferencedChunks(Set<Integer> target) {
  target.add(DataUtils.getPageChunkId(pos));
  for (long p : children) {
    target.add(DataUtils.getPageChunkId(p));
  }
}

/**
 * Only keep one reference to the same chunk. Only leaf references are
 * removed (references to inner nodes are not removed, as they could
 * indirectly point to other chunks).
 */
void removeDuplicateChunkReferences() {
  HashSet<Integer> chunks = new HashSet<>();
  // we don't need references to leaves in the same chunk
  chunks.add(DataUtils.getPageChunkId(pos));
  for (int i = 0; i < children.length; i++) {
    long p = children[i];
    int chunkId = DataUtils.getPageChunkId(p);
    boolean wasNew = chunks.add(chunkId);
    if (DataUtils.getPageType(p) == DataUtils.PAGE_TYPE_NODE) {
      continue;
    }
    if (wasNew) {
      continue;
    }
    removeChild(i--);
  }
}

@Override
public String toString() {
  StringBuilder buff = new StringBuilder();
  buff.append("id: ").append(System.identityHashCode(this)).append('\n');
  buff.append("version: ").append(Long.toHexString(version)).append("\n");
  buff.append("pos: ").append(Long.toHexString(pos)).append("\n");
  if (pos != 0) {
    int chunkId = DataUtils.getPageChunkId(pos);
    buff.append("chunk: ").append(Long.toHexString(chunkId)).append("\n");
  }
  for (int i = 0; i <= keys.length; i++) {
    if (i > 0) {
      buff.append(" ");
    }
    if (children != null) {
      buff.append("[" + Long.toHexString(children[i].pos) + "] ");
    }
    if (i < keys.length) {
      buff.append(keys[i]);
      if (values != null) {
        buff.append(':');
        buff.append(values[i]);
      }
    }
  }
  return buff.toString();
}

/**
 * Only keep one reference to the same chunk. Only leaf references are
 * removed (references to inner nodes are not removed, as they could
 * indirectly point to other chunks).
 */
void removeDuplicateChunkReferences() {
  HashSet<Integer> chunks = New.hashSet();
  // we don't need references to leaves in the same chunk
  chunks.add(DataUtils.getPageChunkId(pos));
  for (int i = 0; i < children.length; i++) {
    long p = children[i];
    int chunkId = DataUtils.getPageChunkId(p);
    boolean wasNew = chunks.add(chunkId);
    if (DataUtils.getPageType(p) == DataUtils.PAGE_TYPE_NODE) {
      continue;
    }
    if (wasNew) {
      continue;
    }
    removeChild(i--);
  }
}

/**
 * Only keep one reference to the same chunk. Only leaf references are
 * removed (references to inner nodes are not removed, as they could
 * indirectly point to other chunks).
 */
void removeDuplicateChunkReferences() {
  HashSet<Integer> chunks = New.hashSet();
  // we don't need references to leaves in the same chunk
  chunks.add(DataUtils.getPageChunkId(pos));
  for (int i = 0; i < children.length; i++) {
    long p = children[i];
    int chunkId = DataUtils.getPageChunkId(p);
    boolean wasNew = chunks.add(chunkId);
    if (DataUtils.getPageType(p) == DataUtils.PAGE_TYPE_NODE) {
      continue;
    }
    if (wasNew) {
      continue;
    }
    removeChild(i--);
  }
}

/**
 * Get the chunk for the given position.
 *
 * @param pos the position
 * @return the chunk
 */
private Chunk getChunk(long pos) {
  Chunk c = getChunkIfFound(pos);
  if (c == null) {
    int chunkId = DataUtils.getPageChunkId(pos);
    throw DataUtils.newIllegalStateException(
        DataUtils.ERROR_FILE_CORRUPT,
        "Chunk {0} not found", chunkId);
  }
  return c;
}

/**
 * Get the chunk for the given position.
 *
 * @param pos the position
 * @return the chunk
 */
private Chunk getChunk(long pos) {
  Chunk c = getChunkIfFound(pos);
  if (c == null) {
    int chunkId = DataUtils.getPageChunkId(pos);
    throw DataUtils.newIllegalStateException(
        DataUtils.ERROR_FILE_CORRUPT,
        "Chunk {0} not found", chunkId);
  }
  return c;
}

/**
 * Get the chunk for the given position.
 *
 * @param pos the position
 * @return the chunk
 */
private Chunk getChunk(long pos) {
  Chunk c = getChunkIfFound(pos);
  if (c == null) {
    int chunkId = DataUtils.getPageChunkId(pos);
    throw DataUtils.newIllegalStateException(
        DataUtils.ERROR_FILE_CORRUPT,
        "Chunk {0} not found", chunkId);
  }
  return c;
}

private Chunk getChunkIfFound(long pos) {
  int chunkId = DataUtils.getPageChunkId(pos);
  Chunk c = chunks.get(chunkId);
  if (c == null) {
    checkOpen();
    if (!Thread.holdsLock(this)) {
      // it could also be unsynchronized metadata
      // access (if synchronization on this was forgotten)
      throw DataUtils.newIllegalStateException(
          DataUtils.ERROR_CHUNK_NOT_FOUND,
          "Chunk {0} no longer exists",
          chunkId);
    }
    String s = meta.get(Chunk.getMetaKey(chunkId));
    if (s == null) {
      return null;
    }
    c = Chunk.fromString(s);
    if (c.block == Long.MAX_VALUE) {
      throw DataUtils.newIllegalStateException(
          DataUtils.ERROR_FILE_CORRUPT,
          "Chunk {0} is invalid", chunkId);
    }
    chunks.put(c.id, c);
  }
  return c;
}