Newtonsoft.Json\Utilities\StringBuffer.cs

#region License

// Copyright (c) 2007 James Newton-King

//

// Permission is hereby granted, free of charge, to any person

// obtaining a copy of this software and associated documentation

// files (the "Software"), to deal in the Software without

// restriction, including without limitation the rights to use,

// copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the

// Software is furnished to do so, subject to the following

// conditions:

//

// The above copyright notice and this permission notice shall be

// included in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

// OTHER DEALINGS IN THE SOFTWARE.

#endregion

using System;

namespace Newtonsoft.Json.Utilities

{

  /// <summary>

  /// Builds a string. Unlike StringBuilder this class lets you reuse it's internal buffer.

  /// </summary>

  internal class StringBuffer

  {

    private char[] _buffer;

    private int _position;

    private static readonly char[] _emptyBuffer = new char[0];

    public int Position

    {

      get { return _position; }

      set { _position = value; }

    }

    public StringBuffer()

    {

      _buffer = _emptyBuffer;

    }

    public StringBuffer(int initalSize)

    {

      _buffer = new char[initalSize];

    }

    public void Append(char value)

    {

      // test if the buffer array is large enough to take the value

      if (_position == _buffer.Length)

      {

        EnsureSize(1);

      }

      // set value and increment poisition

      _buffer[_position++] = value;

    }

    public void Clear()

    {

      _buffer = _emptyBuffer;

      _position = 0;

    }

    private void EnsureSize(int appendLength)

    {

      char[] newBuffer = new char[(_position + appendLength) * 2];

      Array.Copy(_buffer, newBuffer, _position);

      _buffer = newBuffer;

    }

    public override string ToString()

    {

      return ToString(0, _position);

    }

    public string ToString(int start, int length)

    {

      // TODO: validation

      return new string(_buffer, start, length);

    }

    public char[] GetInternalBuffer()

    {

      return _buffer;

    }

  }

}