protected JsonObject processQuery()

in src/main/java/org/apache/datasketches/server/SerializationHandler.java [53:107]
47 lines of code
11 McCabe index (conditional complexity)

  protected JsonObject processQuery(final JsonObject query) {
    if (!query.has(QUERY_NAME_FIELD)) {
      throw new IllegalArgumentException("Query missing sketch name field");
    }

    final String name = query.get(QUERY_NAME_FIELD).getAsString();
    if (!sketches.contains(name)) {
      throw new IllegalArgumentException("Invalid sketch name: " + name);
    }

    final byte[] bytes;
    final SketchStorage.SketchEntry se;

    // need to lock the sketch even when just reading
    synchronized (name.intern()) {
      se = sketches.getSketch(name);

      switch (se.family_) {
        case UNION:
          bytes = ((Union) se.sketch_).getResult().toByteArray();
          break;
        case KLL:
          bytes = ((KllFloatsSketch) se.sketch_).toByteArray();
          break;
        case FREQUENCY:
          bytes = ((ItemsSketch<String>) se.sketch_).toByteArray(new ArrayOfStringsSerDe());
          break;
        case HLL:
          bytes = ((HllSketch) se.sketch_).toCompactByteArray();
          break;
        case CPC:
          bytes = ((CpcSketch) se.sketch_).toByteArray();
          break;
        case RESERVOIR:
          bytes = ((ReservoirItemsSketch<String>) se.sketch_).toByteArray(new ArrayOfStringsSerDe());
          break;
        case VAROPT:
          bytes = ((VarOptItemsSketch<String>) se.sketch_).toByteArray(new ArrayOfStringsSerDe());
          break;
        default:
          throw new IllegalStateException("Unexpected value: " + se.family_);
      }
    }

    final String b64Sketch = Base64.getUrlEncoder().encodeToString(bytes);

    final JsonObject result = new JsonObject();
    result.addProperty(QUERY_NAME_FIELD, name);
    result.addProperty(CONFIG_FAMILY_FIELD, se.family_.getFamilyName());
    if (se.type_ != null)
      result.addProperty(CONFIG_TYPE_FIELD, se.type_.getTypeName());
    result.addProperty(QUERY_SKETCH_FIELD, b64Sketch);

    return result;
  }