/// <summary>
/// Expert: creates a searcher from the provided
/// <see cref="IndexReader"/> using the provided
/// <see cref="SearcherFactory"/>. NOTE: this decRefs incoming reader
/// on throwing an exception.
/// </summary>
public static IndexSearcher GetSearcher(SearcherFactory searcherFactory, IndexReader reader)
{
bool success = false;
IndexSearcher searcher;
try
{
searcher = searcherFactory.NewSearcher(reader);
if (searcher.IndexReader != reader)
{
throw new InvalidOperationException("SearcherFactory must wrap exactly the provided reader (got " + searcher.IndexReader + " but expected " + reader + ")");
}
success = true;
}
finally
{
if (!success)
{
reader.DecRef();
}
}
return(searcher);
}