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LengthCache.cs
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executable file
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
namespace Npgsql
{
/// <summary>
/// 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.
/// </summary>
class LengthCache
{
internal bool IsPopulated;
internal int Position;
internal List<int> Lengths;
internal LengthCache()
{
Lengths = new List<int>();
}
internal LengthCache(int capacity)
{
Lengths = new List<int>(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;
}
}
}