/// <summary>
/// Creates a <seealso cref="TermContext"/> from a top-level <seealso cref="IndexReaderContext"/> and the
/// given <seealso cref="Term"/>. this method will lookup the given term in all context's leaf readers
/// and register each of the readers containing the term in the returned <seealso cref="TermContext"/>
/// using the leaf reader's ordinal.
/// <p>
/// Note: the given context must be a top-level context.
/// </summary>
public static TermContext Build(IndexReaderContext context, Term term)
{
Debug.Assert(context != null && context.IsTopLevel);
string field = term.Field;
BytesRef bytes = term.Bytes;
TermContext perReaderTermState = new TermContext(context);
//if (DEBUG) System.out.println("prts.build term=" + term);
foreach (AtomicReaderContext ctx in context.Leaves)
{
//if (DEBUG) System.out.println(" r=" + leaves[i].reader);
Fields fields = ctx.AtomicReader.Fields;
if (fields != null)
{
Terms terms = fields.GetTerms(field);
if (terms != null)
{
TermsEnum termsEnum = terms.GetIterator(null);
if (termsEnum.SeekExact(bytes))
{
TermState termState = termsEnum.GetTermState();
//if (DEBUG) System.out.println(" found");
perReaderTermState.Register(termState, ctx.Ord, termsEnum.DocFreq, termsEnum.TotalTermFreq);
}
}
}
}
return(perReaderTermState);
}
/// <summary>
/// Returns the filtered enums term state
/// </summary>
public override TermState GetTermState()
{
if (Debugging.AssertsEnabled)
{
Debugging.Assert(tenum != null);
}
return(tenum.GetTermState());
}
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).GetIterator(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.GetTermState()));
}
}
}
}
}
/// <summary>
/// Returns the filtered enums term state
/// </summary>
public override TermState GetTermState()
{
Debug.Assert(tenum != null);
return(tenum.GetTermState());
}