/// <summary>
/// Adds specified string to String heap, if it's not there already.
/// </summary>
/// <param name="value">Array containing the blob.</param>
/// <returns>Handle to the added or existing blob.</returns>
/// <exception cref="ArgumentNullException"><paramref name="value"/> is null.</exception>
public StringHandle GetOrAddString(string value)
{
if (value == null)
{
Throw.ArgumentNull(nameof(value));
}
StringHandle handle;
if (value.Length == 0)
{
handle = default(StringHandle);
}
else if (!_strings.TryGetValue(value, out handle))
{
handle = StringHandle.FromWriterVirtualIndex(_strings.Count + 1); // idx 0 is reserved for empty string
_strings.Add(value, handle);
}
return(handle);
}