/// <summary>
/// Gets or sets the symbol at the specified index.
/// </summary>
/// <param name="index">The zero-based index of the symbol to get or set.</param>
/// <returns> The symbol at the specified index.</returns>
public ISequenceItem this[int index]
{
get
{
int position = index;
if (_editedSequences != null && _editedSequences.Values.Count > 0)
{
CacheBox <IDerivedSequence> editedBlock = GetEditedBlock(position);
if (editedBlock != null)
{
IDerivedSequence derivedSeq = editedBlock.Data;
return(derivedSeq[position - (int)editedBlock.StartRange]);
}
else
{
position = position + (int)GetPositionDiff(position);
}
}
CacheBox <Sequence> block = GetCacheBlock(position);
if (block != null)
{
return(block.Data[position - (int)block.StartRange]);
}
else
{
return(null);
}
}
set
{
if (value == null)
{
throw new ArgumentNullException("value");
}
if (IsReadOnly)
{
throw new InvalidOperationException(Properties.Resource.CanNotModifyReadonlySequence);
}
// Sequence edit is not taken care when DV is enabled.
}
}
/// <summary>
/// Gets or sets the symbol at the specified index.
/// </summary>
/// <param name="index">The zero-based index of the symbol to get or set.</param>
/// <returns> The symbol at the specified index.</returns>
public byte this[int index]
{
get
{
int position = index;
if (_editedSequences != null && _editedSequences.Values.Count > 0)
{
CacheBox <IDerivedSequence> editedBlock = GetEditedBlock(position);
if (editedBlock != null)
{
IDerivedSequence derivedSeq = editedBlock.Data;
return((byte)derivedSeq[position - (int)editedBlock.StartRange].Symbol);
}
else
{
position = position + (int)GetPositionDiff(position);
}
}
CacheBox <byte[]> block = GetCacheBlock(position);
if (block != null)
{
return(block.Data[position - (int)block.StartRange]);
}
else
{
return(default(byte));
}
}
set
{
if (IsReadOnly)
{
throw new InvalidOperationException(Properties.Resource.CanNotModifyReadonlySequence);
}
Replace(index, value);
}
}