private readonly IList <IndexReader> subReadersList; // LUCENENET: Changed from IList<R> to IList<IndexReader> to eliminate casting
/// <summary>
/// Constructs a <see cref="BaseCompositeReader{R}"/> on the given <paramref name="subReaders"/>. </summary>
/// <param name="subReaders"> the wrapped sub-readers. This array is returned by
/// <see cref="GetSequentialSubReaders()"/> and used to resolve the correct
/// subreader for docID-based methods. <b>Please note:</b> this array is <b>not</b>
/// cloned and not protected for modification, the subclass is responsible
/// to do this. </param>
protected BaseCompositeReader(R[] subReaders)
{
this.subReaders = subReaders;
// LUCENENET: To eliminate casting, we create the list explicitly
var subReadersList = new JCG.List <IndexReader>(subReaders.Length);
for (int i = 0; i < subReaders.Length; i++)
{
subReadersList.Add(subReaders[i]);
}
this.subReadersList = subReadersList.AsReadOnly();
starts = new int[subReaders.Length + 1]; // build starts array
int maxDoc = 0, numDocs = 0;
for (int i = 0; i < subReaders.Length; i++)
{
starts[i] = maxDoc;
IndexReader r = subReaders[i];
maxDoc += r.MaxDoc; // compute maxDocs
if (maxDoc < 0) // overflow
{
throw new ArgumentException("Too many documents, composite IndexReaders cannot exceed " + int.MaxValue);
}
numDocs += r.NumDocs; // compute numDocs
r.RegisterParentReader(this);
}
starts[subReaders.Length] = maxDoc;
this.maxDoc = maxDoc;
this.numDocs = numDocs;
}