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EvaluationContext.cs
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EvaluationContext.cs
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using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
namespace LinqToDB.SqlQuery
{
using Common;
public class EvaluationContext
{
private Dictionary<IQueryElement, (object? value, bool success)>? _evaluationCache;
public EvaluationContext(IReadOnlyParameterValues? parameterValues = null)
{
ParameterValues = parameterValues;
}
public IReadOnlyParameterValues? ParameterValues { get; }
public bool IsParametersInitialized => ParameterValues != null;
internal bool TryGetValue(IQueryElement expr, [NotNullWhen(true)] out (object? value, bool success)? info)
{
if (_evaluationCache == null)
{
info = null;
return false;
}
if (_evaluationCache.TryGetValue(expr, out var infoValue))
{
info = infoValue;
return true;
}
info = null;
return false;
}
public void Register(IQueryElement expr, object? value)
{
_evaluationCache ??= new (Utils.ObjectReferenceEqualityComparer<IQueryElement>.Default);
_evaluationCache.Add(expr, (value, true));
}
public void RegisterError(IQueryElement expr)
{
_evaluationCache ??= new(Utils.ObjectReferenceEqualityComparer<IQueryElement>.Default);
_evaluationCache.Add(expr, (null, false));
}
}
}