Lucene.Net.Index.BaseTermVectorsFormatTestCase.RandomPayload C# (CSharp) Method

        protected internal virtual BytesRef RandomPayload()
        {
            int len = Random().Next(5);
            if (len == 0)
            {
                return null;
            }
            BytesRef payload = new BytesRef(len);
            Random().NextBytes((byte[])(Array)payload.Bytes);
            payload.Length = len;
            return payload;
        }

            protected internal RandomTokenStream(BaseTermVectorsFormatTestCase outerInstance, int len, string[] sampleTerms, BytesRef[] sampleTermBytes, bool offsetsGoBackwards)
            {
                this.OuterInstance = outerInstance;
                Terms = new string[len];
                TermBytes = new BytesRef[len];
                PositionsIncrements = new int[len];
                Positions = new int[len];
                StartOffsets = new int[len];
                EndOffsets = new int[len];
                Payloads = new BytesRef[len];
                for (int i = 0; i < len; ++i)
                {
                    int o = Random().Next(sampleTerms.Length);
                    Terms[i] = sampleTerms[o];
                    TermBytes[i] = sampleTermBytes[o];
                    PositionsIncrements[i] = TestUtil.NextInt(Random(), i == 0 ? 1 : 0, 10);
                    if (offsetsGoBackwards)
                    {
                        StartOffsets[i] = Random().Next();
                        EndOffsets[i] = Random().Next();
                    }
                    else
                    {
                        if (i == 0)
                        {
                            StartOffsets[i] = TestUtil.NextInt(Random(), 0, 1 << 16);
                        }
                        else
                        {
                            StartOffsets[i] = StartOffsets[i - 1] + TestUtil.NextInt(Random(), 0, Rarely() ? 1 << 16 : 20);
                        }
                        EndOffsets[i] = StartOffsets[i] + TestUtil.NextInt(Random(), 0, Rarely() ? 1 << 10 : 20);
                    }
                }

                for (int i = 0; i < len; ++i)
                {
                    if (i == 0)
                    {
                        Positions[i] = PositionsIncrements[i] - 1;
                    }
                    else
                    {
                        Positions[i] = Positions[i - 1] + PositionsIncrements[i];
                    }
                }
                if (Rarely())
                {
                    Arrays.Fill(Payloads, outerInstance.RandomPayload());
                }
                else
                {
                    for (int i = 0; i < len; ++i)
                    {
                        Payloads[i] = outerInstance.RandomPayload();
                    }
                }

                PositionToTerms = new Dictionary<int?, ISet<int?>>(len);
                StartOffsetToTerms = new Dictionary<int?, ISet<int?>>(len);
                for (int i = 0; i < len; ++i)
                {
                    if (!PositionToTerms.ContainsKey(Positions[i]))
                    {
                        PositionToTerms[Positions[i]] = new HashSet<int?>();//size1
                    }
                    PositionToTerms[Positions[i]].Add(i);
                    if (!StartOffsetToTerms.ContainsKey(StartOffsets[i]))
                    {
                        StartOffsetToTerms[StartOffsets[i]] = new HashSet<int?>();//size1
                    }
                    StartOffsetToTerms[StartOffsets[i]].Add(i);
                }

                Freqs = new Dictionary<string, int?>();
                foreach (string term in Terms)
                {
                    if (Freqs.ContainsKey(term))
                    {
                        Freqs[term] = Freqs[term] + 1;
                    }
                    else
                    {
                        Freqs[term] = 1;
                    }
                }

                AddAttributeImpl(new PermissiveOffsetAttributeImpl());

                TermAtt = AddAttribute<ICharTermAttribute>();
                PiAtt = AddAttribute<IPositionIncrementAttribute>();
                OAtt = AddAttribute<IOffsetAttribute>();
                PAtt = AddAttribute<IPayloadAttribute>();
            }