#region License
// The PostgreSQL License
//
// Copyright (C) 2015 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
namespace Npgsql
{
///
/// An array of cached lengths for the parameters sending process.
///
/// When sending parameters, lengths need to be calculated more than once (once for Bind, once for
/// an array, once for the string within that array). This cache optimized that. Lengths are added
/// to the cache, and then retrieved at the same order.
///
class LengthCache
{
internal bool IsPopulated;
internal int Position;
internal List Lengths;
internal LengthCache()
{
Lengths = new List();
}
internal LengthCache(int capacity)
{
Lengths = new List(capacity);
}
internal int Set(int len)
{
Contract.Requires(!IsPopulated);
Lengths.Add(len);
Position++;
return len;
}
internal int Get()
{
Contract.Requires(IsPopulated);
return Lengths[Position++];
}
internal int GetLast()
{
Contract.Requires(IsPopulated);
return Lengths[Position-1];
}
internal void Rewind()
{
Position = 0;
IsPopulated = true;
}
internal void Clear()
{
Lengths.Clear();
Position = 0;
IsPopulated = false;
}
}
}