code: public Optional<MediaType> match(Iterable<MediaType> ranges) {
          requireNonNull(ranges, "ranges");
  
          MediaType match = null;
          float matchQ = Float.NEGATIVE_INFINITY;    // higher = better
          int matchNumWildcards = Integer.MAX_VALUE; // lower = better
          int matchNumParams = Integer.MIN_VALUE;    // higher = better
          for (MediaType range : ranges) {
              requireNonNull(range, "ranges contains null.");
              float qValue = range.qualityFactor(Float.NEGATIVE_INFINITY);
              final int numWildcards = range.numWildcards();
              final int numParams;
              if (qValue < 0) {
                  // qvalue does not exist; use the default value of 1.0.
                  qValue = 1.0f;
                  numParams = range.parameters().size();
              } else {
                  // Do not count the qvalue.
                  numParams = range.parameters().size() - 1;
              }
  
              for (MediaType candidate : mediaTypes) {
                  if (!candidate.belongsTo(range)) {
                      continue;
                  }
  
                  final boolean isBetter;
                  if (qValue > matchQ) {
                      isBetter = true;
                  } else if (Math.copySign(qValue - matchQ, 1.0f) <= 0.0001f) {
                      if (matchNumWildcards > numWildcards) {
                          isBetter = true;
                      } else if (matchNumWildcards == numWildcards) {
                          isBetter = numParams > matchNumParams;
                      } else {
                          isBetter = false;
                      }
                  } else {
                      isBetter = false;
                  }
  
                  if (isBetter) {
                      match = candidate;
                      matchQ = qValue;
                      matchNumWildcards = numWildcards;
                      matchNumParams = numParams;
  
                      // Won't find another better candidate for this range.
                      break;
                  }
              }
          }
  
          return Optional.ofNullable(match);
      }
docs: Finds the {@link MediaType} in this {@link List} that matches one of the specified media ranges.
  
  @return the most preferred {@link MediaType} that matches one of the specified media ranges.
  {@link Optional#empty()} if there are no matches or {@code ranges} does not contain
  any valid ranges.