StringBuffer
struct StringBuffer
Builds a string. Unlike StringBuilder this class lets you reuse its internal buffer.
using System;
namespace Newtonsoft.Json.Utilities
{
internal struct StringBuffer
{
private char[] _buffer;
private int _position;
public int Position {
get {
return _position;
}
set {
_position = value;
}
}
public bool IsEmpty => _buffer == null;
public char[] InternalBuffer => _buffer;
public StringBuffer(IArrayPool<char> bufferPool, int initalSize)
{
this = new StringBuffer(BufferUtils.RentBuffer(bufferPool, initalSize));
}
private StringBuffer(char[] buffer)
{
_buffer = buffer;
_position = 0;
}
public void Append(IArrayPool<char> bufferPool, char value)
{
if (_position == _buffer.Length)
EnsureSize(bufferPool, 1);
_buffer[_position++] = value;
}
public void Append(IArrayPool<char> bufferPool, char[] buffer, int startIndex, int count)
{
if (_position + count >= _buffer.Length)
EnsureSize(bufferPool, count);
Array.Copy(buffer, startIndex, _buffer, _position, count);
_position += count;
}
public void Clear(IArrayPool<char> bufferPool)
{
if (_buffer != null) {
BufferUtils.ReturnBuffer(bufferPool, _buffer);
_buffer = null;
}
_position = 0;
}
private void EnsureSize(IArrayPool<char> bufferPool, int appendLength)
{
char[] array = BufferUtils.RentBuffer(bufferPool, (_position + appendLength) * 2);
if (_buffer != null) {
Array.Copy(_buffer, array, _position);
BufferUtils.ReturnBuffer(bufferPool, _buffer);
}
_buffer = array;
}
public override string ToString()
{
return ToString(0, _position);
}
public string ToString(int start, int length)
{
return new string(_buffer, start, length);
}
}
}