public String8Raw ReadRaw(ArraySelector selector)
{
if (selector.Equals(_currentRaw.Selector))
{
return(_currentRaw);
}
bool includesFirstString = (selector.StartIndexInclusive == 0);
_currentRaw.Selector = selector;
// Read the string positions
_currentRaw.Positions = _positionsReader.Read(ArraySelector.All(Count).Slice((includesFirstString ? 0 : selector.StartIndexInclusive - 1), selector.EndIndexExclusive));
if (_currentRaw.Positions.Selector.Indices != null)
{
throw new NotImplementedException("String8TypeProvider requires positions to be read contiguously.");
}
int[] positionArray = (int[])_currentRaw.Positions.Array;
// Get the full byte range of all of the strings
int firstStringStart = (includesFirstString ? 0 : positionArray[_currentRaw.Positions.Index(0)]);
int lastStringEnd = positionArray[_currentRaw.Positions.Index(_currentRaw.Positions.Count - 1)];
// Read the raw string bytes
_currentRaw.Bytes = _bytesReader.Read(ArraySelector.All(int.MaxValue).Slice(firstStringStart, lastStringEnd));
if (_currentRaw.Bytes.Selector.Indices != null)
{
throw new NotImplementedException("String8TypeProvider requires positions to be read contiguously.");
}
return(_currentRaw);
}
public XArray Read(ArraySelector selector)
{
if (selector.Indices != null)
{
throw new NotImplementedException();
}
// Return the previous xarray if re-requested
if (selector.Equals(_currentSelector))
{
return(_currentArray);
}
// Allocate the result array
Allocator.AllocateToSize(ref _array, selector.Count);
// Read items in pages of 64k
int byteStart = _bytesPerItem * selector.StartIndexInclusive;
int byteEnd = _bytesPerItem * selector.EndIndexExclusive;
int bytesRead = 0;
for (int currentByteIndex = byteStart; currentByteIndex < byteEnd; currentByteIndex += ReadPageSize)
{
int currentByteEnd = Math.Min(byteEnd, currentByteIndex + ReadPageSize);
XArray bytexarray = _byteReader.Read(ArraySelector.All(int.MaxValue).Slice(currentByteIndex, currentByteEnd));
Buffer.BlockCopy(bytexarray.Array, 0, _array, bytesRead, bytexarray.Count);
bytesRead += currentByteEnd - currentByteIndex;
}
// Cache and return the current xarray
_currentArray = XArray.All(_array, selector.Count);
_currentSelector = selector;
return(_currentArray);
}
public XArray Read(ArraySelector selector)
{
if (selector.Equals(_currentSelector))
{
return(_currentArray);
}
_currentArray = _converter(_innerReader.Read(selector));
_currentSelector = selector;
return(_currentArray);
}
public XArray Read(ArraySelector selector)
{
if (selector.Indices != null)
{
return(ReadIndices(selector));
}
if (selector.Count == 0)
{
return(XArray.All(_resultArray, 0));
}
// Return previous xarray if re-requested
if (selector.Equals(_currentSelector))
{
return(_currentArray);
}
Allocator.AllocateToSize(ref _resultArray, selector.Count);
bool includesFirstString = (selector.StartIndexInclusive == 0);
// Read the string positions and bytes
ReadRaw(selector);
// Update the String8 array to point to them
byte[] textArray = (byte[])_currentRaw.Bytes.Array;
int[] positionArray = (int[])_currentRaw.Positions.Array;
int firstStringStart = (includesFirstString ? 0 : positionArray[_currentRaw.Positions.Index(0)]);
int positionOffset = _currentRaw.Positions.Index((includesFirstString ? 0 : 1));
int textOffset = firstStringStart - _currentRaw.Bytes.Index(0);
int previousStringEnd = firstStringStart - textOffset;
for (int i = 0; i < selector.Count; ++i)
{
int valueEnd = positionArray[i + positionOffset] - textOffset;
_resultArray[i] = new String8(textArray, previousStringEnd, valueEnd - previousStringEnd);
previousStringEnd = valueEnd;
}
// Cache the xarray and return it
_currentArray = XArray.All(_resultArray, selector.Count);
_currentSelector = selector;
return(_currentArray);
}
public XArray Read(ArraySelector selector)
{
// Return the cached xarray if re-requested
if (selector.Equals(_currentSelector))
{
return(_currentArray);
}
// Read the values themselves
XArray values = _valueReader.Read(selector);
// Read the null markers
XArray nulls = _nullReader.Read(selector);
// Cache and return the values and null markers together
_currentArray = XArray.All(values.Array, -1, (bool[])nulls.Array).Reselect(values.Selector);
_currentSelector = selector;
return(_currentArray);
}
