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//---------------------------------------------------------------------
// <copyright file="SymbolUsageManager.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
//---------------------------------------------------------------------
using System;
using System.Collections.Generic;
namespace System.Data.SqlClient.SqlGen
{
/// <summary>
/// Used for wrapping a boolean value as an object.
/// </summary>
internal class BoolWrapper
{
internal bool Value {get; set;}
internal BoolWrapper()
{
this.Value = false;
}
}
/// <summary>
/// Tracks the usage of symbols.
/// When registering a symbol with the usage manager if an input symbol is specified,
/// than the usage of the two is 'connected' - if one ever gets marked as used,
/// the other one becomes 'used' too.
/// </summary>
internal class SymbolUsageManager
{
private readonly Dictionary<Symbol, BoolWrapper> optionalColumnUsage = new Dictionary<Symbol, BoolWrapper>();
internal bool ContainsKey(Symbol key)
{
return optionalColumnUsage.ContainsKey(key);
}
internal bool TryGetValue(Symbol key, out bool value)
{
BoolWrapper wrapper;
if (optionalColumnUsage.TryGetValue(key, out wrapper))
{
value = wrapper.Value;
return true;
}
value = false;
return false;
}
internal void Add(Symbol sourceSymbol, Symbol symbolToAdd)
{
BoolWrapper wrapper;
if (sourceSymbol == null || !this.optionalColumnUsage.TryGetValue(sourceSymbol, out wrapper))
{
wrapper = new BoolWrapper();
}
this.optionalColumnUsage.Add(symbolToAdd, wrapper);
}
internal void MarkAsUsed(Symbol key)
{
if (optionalColumnUsage.ContainsKey(key))
{
optionalColumnUsage[key].Value = true;
}
}
internal bool IsUsed(Symbol key)
{
return optionalColumnUsage[key].Value;
}
}
}
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