Lucene.Net.Index.TestTermsEnum.TestRandomSeeks C# (CSharp) Method

        private void TestRandomSeeks(IndexReader r, params string[] validTermStrings)
        {
            BytesRef[] validTerms = new BytesRef[validTermStrings.Length];
            for (int termIDX = 0; termIDX < validTermStrings.Length; termIDX++)
            {
                validTerms[termIDX] = new BytesRef(validTermStrings[termIDX]);
            }
            Array.Sort(validTerms);
            if (VERBOSE)
            {
                Console.WriteLine("TEST: " + validTerms.Length + " terms:");
                foreach (BytesRef t in validTerms)
                {
                    Console.WriteLine("  " + t.Utf8ToString() + " " + t);
                }
            }
            TermsEnum te = MultiFields.GetTerms(r, FIELD).Iterator(null);

            int END_LOC = -validTerms.Length - 1;

            IList<TermAndState> termStates = new List<TermAndState>();

            for (int iter = 0; iter < 100 * RANDOM_MULTIPLIER; iter++)
            {
                BytesRef t;
                int loc;
                TermState termState;
                if (Random().Next(6) == 4)
                {
                    // pick term that doens't exist:
                    t = GetNonExistTerm(validTerms);
                    termState = null;
                    if (VERBOSE)
                    {
                        Console.WriteLine("\nTEST: invalid term=" + t.Utf8ToString());
                    }
                    loc = Array.BinarySearch(validTerms, t);
                }
                else if (termStates.Count != 0 && Random().Next(4) == 1)
                {
                    TermAndState ts = termStates[Random().Next(termStates.Count)];
                    t = ts.Term;
                    loc = Array.BinarySearch(validTerms, t);
                    Assert.IsTrue(loc >= 0);
                    termState = ts.State;
                    if (VERBOSE)
                    {
                        Console.WriteLine("\nTEST: valid termState term=" + t.Utf8ToString());
                    }
                }
                else
                {
                    // pick valid term
                    loc = Random().Next(validTerms.Length);
                    t = BytesRef.DeepCopyOf(validTerms[loc]);
                    termState = null;
                    if (VERBOSE)
                    {
                        Console.WriteLine("\nTEST: valid term=" + t.Utf8ToString());
                    }
                }

                // seekCeil or seekExact:
                bool doSeekExact = Random().NextBoolean();
                if (termState != null)
                {
                    if (VERBOSE)
                    {
                        Console.WriteLine("  seekExact termState");
                    }
                    te.SeekExact(t, termState);
                }
                else if (doSeekExact)
                {
                    if (VERBOSE)
                    {
                        Console.WriteLine("  seekExact");
                    }
                    Assert.AreEqual(loc >= 0, te.SeekExact(t));
                }
                else
                {
                    if (VERBOSE)
                    {
                        Console.WriteLine("  seekCeil");
                    }

                    TermsEnum.SeekStatus result = te.SeekCeil(t);
                    if (VERBOSE)
                    {
                        Console.WriteLine("  got " + result);
                    }

                    if (loc >= 0)
                    {
                        Assert.AreEqual(TermsEnum.SeekStatus.FOUND, result);
                    }
                    else if (loc == END_LOC)
                    {
                        Assert.AreEqual(TermsEnum.SeekStatus.END, result);
                    }
                    else
                    {
                        Debug.Assert(loc >= -validTerms.Length);
                        Assert.AreEqual(TermsEnum.SeekStatus.NOT_FOUND, result);
                    }
                }

                if (loc >= 0)
                {
                    Assert.AreEqual(t, te.Term());
                }
                else if (doSeekExact)
                {
                    // TermsEnum is unpositioned if seekExact returns false
                    continue;
                }
                else if (loc == END_LOC)
                {
                    continue;
                }
                else
                {
                    loc = -loc - 1;
                    Assert.AreEqual(validTerms[loc], te.Term());
                }

                // Do a bunch of next's after the seek
                int numNext = Random().Next(validTerms.Length);

                for (int nextCount = 0; nextCount < numNext; nextCount++)
                {
                    if (VERBOSE)
                    {
                        Console.WriteLine("\nTEST: next loc=" + loc + " of " + validTerms.Length);
                    }
                    BytesRef t2 = te.Next();
                    loc++;
                    if (loc == validTerms.Length)
                    {
                        Assert.IsNull(t2);
                        break;
                    }
                    else
                    {
                        Assert.AreEqual(validTerms[loc], t2);
                        if (Random().Next(40) == 17 && termStates.Count < 100)
                        {
                            termStates.Add(new TermAndState(validTerms[loc], te.TermState()));
                        }
                    }
                }
            }
        }