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//---------------------------------------------------------------------
// <copyright file="QueryParameter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner [....]
// @backupOwner [....]
//---------------------------------------------------------------------
namespace System.Data.Common.EntitySql.AST
{
using System;
/// <summary>
/// Represents an ast node for a query parameter.
/// </summary>
internal sealed class QueryParameter : Node
{
private readonly string _name;
/// <summary>
/// Initializes parameter
/// </summary>
/// <remarks>
/// <exception cref="System.Data.EntityException">Thrown if the parameter name does not conform to the expected format</exception>
/// </remarks>
internal QueryParameter(string parameterName, string query, int inputPos)
: base(query, inputPos)
{
_name = parameterName.Substring(1);
//
// valid parameter format is: @({LETTER})(_|{LETTER}|{DIGIT})*
//
if (_name.StartsWith("_", StringComparison.OrdinalIgnoreCase) || Char.IsDigit(_name, 0))
{
throw EntityUtil.EntitySqlError(ErrCtx, System.Data.Entity.Strings.InvalidParameterFormat(_name));
}
}
/// <summary>
/// Returns parameter parameterName (without @ sign).
/// </summary>
internal string Name
{
get { return _name; }
}
}
}
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