static String toStringImpl()

in src/main/java/org/apache/datasketches/kll/KllHelper.java [501:558]
51 lines of code
11 McCabe index (conditional complexity)

  static <T> String toStringImpl(final KllSketch sketch, final boolean withLevels, final boolean withLevelsAndItems,
      final ArrayOfItemsSerDe<T> serDe) {
    final StringBuilder sb = new StringBuilder();
    final int k = sketch.getK();
    final int m = sketch.getM();
    final int numLevels = sketch.getNumLevels();
    final int[] fullLevelsArr = sketch.getLevelsArray(UPDATABLE);

    final SketchType sketchType = sketch.sketchType;
    final boolean hasMemory = sketch.hasMemory();
    final long n = sketch.getN();
    final String epsPct = String.format("%.3f%%", sketch.getNormalizedRankError(false) * 100);
    final String epsPMFPct = String.format("%.3f%%", sketch.getNormalizedRankError(true) * 100);
    final boolean compact = sketch.isCompactMemoryFormat();

    final String directStr = hasMemory ? "Direct" : "";
    final String compactStr = compact ? "Compact" : "";
    final String readOnlyStr = sketch.isReadOnly() ? "true" + ("(" + (compact ? "Format" : "Memory") + ")") : "false";
    final String skTypeStr = sketchType.getName();
    final String className = "Kll" + directStr + compactStr + skTypeStr;

    sb.append(LS + "### ").append(className).append(" Summary:").append(LS);
    sb.append("   K                      : ").append(k).append(LS);
    sb.append("   Dynamic min K          : ").append(sketch.getMinK()).append(LS);
    sb.append("   M                      : ").append(m).append(LS);
    sb.append("   N                      : ").append(n).append(LS);
    sb.append("   Epsilon                : ").append(epsPct).append(LS);
    sb.append("   Epsilon PMF            : ").append(epsPMFPct).append(LS);
    sb.append("   Empty                  : ").append(sketch.isEmpty()).append(LS);
    sb.append("   Estimation Mode        : ").append(sketch.isEstimationMode()).append(LS);
    sb.append("   Levels                 : ").append(numLevels).append(LS);
    sb.append("   Level 0 Sorted         : ").append(sketch.isLevelZeroSorted()).append(LS);
    sb.append("   Capacity Items         : ").append(fullLevelsArr[numLevels]).append(LS);
    sb.append("   Retained Items         : ").append(sketch.getNumRetained()).append(LS);
    sb.append("   Free Space             : ").append(sketch.levelsArr[0]).append(LS);
    sb.append("   ReadOnly               : ").append(readOnlyStr).append(LS);
    if (sketchType != ITEMS_SKETCH) {
      sb.append("   Updatable Storage Bytes: ").append(sketch.currentSerializedSizeBytes(true)).append(LS);
    }
    sb.append("   Compact Storage Bytes  : ").append(sketch.currentSerializedSizeBytes(false)).append(LS);

    final String emptyStr = (sketchType == ITEMS_SKETCH) ? "Null" : "NaN";

    sb.append("   Min Item               : ").append(sketch.isEmpty() ? emptyStr : sketch.getMinItemAsString())
        .append(LS);
    sb.append("   Max Item               : ").append(sketch.isEmpty() ? emptyStr : sketch.getMaxItemAsString())
        .append(LS);
    sb.append("### End sketch summary").append(LS);

    if (withLevels) {
      sb.append(outputLevels(k, m, numLevels, fullLevelsArr));
    }

    if (withLevelsAndItems) {
      sb.append(outputDataDetail(sketch));
    }
    return sb.toString();
  }