public IIndex <TKey, TSource> BuildIndex(IEnumerable <TSource> source, IndexType indexType, bool recalculateIndex = false)
{
if (this.indexType == indexType)
{
if (IndexCollection == null || recalculateIndex)
{
Func <TSource, TKey> keySelectorExecutable = KeySelector.Compile();
IIndex <TKey, TSource> indexCollection = null;
if (indexType == IndexType.EqualIndex)
{
indexCollection = source.IndexSpecificationToIndex <TSource, TKey>(keySelectorExecutable);
}
else
{
indexCollection = source.UnequalIndexSpecificationToIndex <TSource, TKey>(keySelectorExecutable);
}
IndexCollection = indexCollection;
}
return(IndexCollection);
}
else
{
if (IndexCollection == null || recalculateIndex)
{
this.indexType = indexType;
Func <TSource, TKey> keySelectorExecutable = KeySelector.Compile();
IIndex <TKey, TSource> indexCollection = null;
if (indexType == IndexType.EqualIndex)
{
indexCollection = source.IndexSpecificationToIndex <TSource, TKey>(keySelectorExecutable);
}
else
{
indexCollection = source.UnequalIndexSpecificationToIndex <TSource, TKey>(keySelectorExecutable);
}
IndexCollection = indexCollection;
}
return(IndexCollection);
}
}