/// <summary>
/// Walks up the reader tree and return the given context's top level reader
/// context, or in other words the reader tree's root context.
/// </summary>
public static IndexReaderContext GetTopLevelContext(IndexReaderContext context)
{
while (context.Parent != null)
{
context = context.Parent;
}
return context;
}
//public static boolean DEBUG = BlockTreeTermsWriter.DEBUG;
/// <summary>
/// Creates an empty <seealso cref="TermContext"/> from a <seealso cref="IndexReaderContext"/>
/// </summary>
public TermContext(IndexReaderContext context)
{
Debug.Assert(context != null && context.IsTopLevel);
TopReaderContext = context;
docFreq = 0;
int len;
if (context.Leaves == null)
{
len = 1;
}
else
{
len = context.Leaves.Count;
}
States = new TermState[len];
}
public static Spans Wrap(IndexReaderContext topLevelReaderContext, SpanQuery query)
{
IDictionary<Term, TermContext> termContexts = new Dictionary<Term, TermContext>();
SortedSet<Term> terms = new SortedSet<Term>();
query.ExtractTerms(terms);
foreach (Term term in terms)
{
termContexts[term] = TermContext.Build(topLevelReaderContext, term);
}
IList<AtomicReaderContext> leaves = topLevelReaderContext.Leaves();
if (leaves.Count == 1)
{
AtomicReaderContext ctx = leaves[0];
return query.GetSpans(ctx, ((AtomicReader)ctx.Reader()).LiveDocs, termContexts);
}
return new MultiSpansWrapper(leaves, query, termContexts);
}
/// <param name="context">
/// that contains doc with payloads to extract
/// </param>
/// <seealso cref= IndexReader#getContext() </seealso>
public PayloadSpanUtil(IndexReaderContext context)
{
this.Context = context;
}
/// <summary>
/// Creates a <seealso cref="TermContext"/> with an initial <seealso cref="TermState"/>,
/// <seealso cref="IndexReader"/> pair.
/// </summary>
public TermContext(IndexReaderContext context, TermState state, int ord, int docFreq, long totalTermFreq)
: this(context)
{
Register(state, ord, docFreq, totalTermFreq);
}
/// <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.Terms(field);
if (terms != null)
{
TermsEnum termsEnum = terms.Iterator(null);
if (termsEnum.SeekExact(bytes))
{
TermState termState = termsEnum.TermState();
//if (DEBUG) System.out.println(" found");
perReaderTermState.Register(termState, ctx.Ord, termsEnum.DocFreq(), termsEnum.TotalTermFreq());
}
}
}
}
return perReaderTermState;
}
/// <summary>
/// Creates a <see cref="TermContext"/> with an initial <see cref="TermState"/>,
/// <see cref="IndexReader"/> pair.
/// </summary>
public TermContext(IndexReaderContext context, TermState state, int ord, int docFreq, long totalTermFreq)
: this(context)
{
Register(state, ord, docFreq, totalTermFreq);
}