Example #1
0
  private Node makeSiblings(Node node, Node sibling) {
    int parentLevel = MAX_BITS - Long.numberOfLeadingZeros(node.bits ^ sibling.bits);

    Node parent = createNode(node.bits, parentLevel, 0);

    // the branch is given by the bit at the level one below parent
    long branch = sibling.bits & parent.getBranchMask();
    if (branch == 0) {
      parent.left = sibling;
      parent.right = node;
    } else {
      parent.left = node;
      parent.right = sibling;
    }

    return parent;
  }
Example #2
0
  private Node merge(Node node, Node other) {
    if (node == null) {
      return copyRecursive(other);
    } else if (other == null) {
      return node;
    } else if (!inSameSubtree(node.bits, other.bits, Math.max(node.level, other.level))) {
      return makeSiblings(node, copyRecursive(other));
    } else if (node.level > other.level) {
      long branch = other.bits & node.getBranchMask();

      if (branch == 0) {
        node.left = merge(node.left, other);
      } else {
        node.right = merge(node.right, other);
      }
      return node;
    } else if (node.level < other.level) {
      Node result = createNode(other.bits, other.level, other.weightedCount);

      long branch = node.bits & other.getBranchMask();
      if (branch == 0) {
        result.left = merge(node, other.left);
        result.right = copyRecursive(other.right);
      } else {
        result.left = copyRecursive(other.left);
        result.right = merge(node, other.right);
      }

      return result;
    }

    // else, they must be at the same level and on the same path, so just bump the counts
    double oldWeight = node.weightedCount;

    weightedCount += other.weightedCount;
    node.weightedCount = node.weightedCount + other.weightedCount;
    node.left = merge(node.left, other.left);
    node.right = merge(node.right, other.right);

    if (oldWeight < ZERO_WEIGHT_THRESHOLD && node.weightedCount >= ZERO_WEIGHT_THRESHOLD) {
      nonZeroNodeCount++;
    }

    return node;
  }
Example #3
0
 private void setChild(Node parent, long branch, Node child) {
   if (parent == null) {
     root = child;
   } else if (branch == 0) {
     parent.left = child;
   } else {
     parent.right = child;
   }
 }
Example #4
0
  private Node copyRecursive(Node node) {
    Node result = null;

    if (node != null) {
      result = createNode(node.bits, node.level, node.weightedCount);
      result.left = copyRecursive(node.left);
      result.right = copyRecursive(node.right);
    }

    return result;
  }
Example #5
0
  public static QuantileDigest deserialize(DataInput input) {
    try {
      double maxError = input.readDouble();
      double alpha = input.readDouble();

      QuantileDigest result = new QuantileDigest(maxError, alpha);

      result.landmarkInSeconds = input.readLong();
      result.min = input.readLong();
      result.max = input.readLong();
      result.totalNodeCount = input.readInt();

      Deque<Node> stack = new ArrayDeque<>();
      for (int i = 0; i < result.totalNodeCount; i++) {
        int flags = input.readByte();

        Node node = deserializeNode(input);

        if ((flags & Flags.HAS_RIGHT) != 0) {
          node.right = stack.pop();
        }

        if ((flags & Flags.HAS_LEFT) != 0) {
          node.left = stack.pop();
        }

        stack.push(node);
        result.weightedCount += node.weightedCount;
        if (node.weightedCount >= ZERO_WEIGHT_THRESHOLD) {
          result.nonZeroNodeCount++;
        }
      }

      if (!stack.isEmpty()) {
        Preconditions.checkArgument(
            stack.size() == 1, "Tree is corrupted. Expected a single root node");
        result.root = stack.pop();
      }

      return result;
    } catch (IOException e) {
      throw Throwables.propagate(e);
    }
  }