//---------------------------------------------------------------------
// <copyright file="QualifiedCellIdBoolean.cs" company="Microsoft">
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
 
using System.Data.Common.CommandTrees;
using System.Data.Mapping.ViewGeneration.CqlGeneration;
using System.Diagnostics;
using System.Text;
 
namespace System.Data.Mapping.ViewGeneration.Structures
{
    /// <summary>
    /// A class that denotes "block_alias.booleanVar", e.g., "T1._from2".
    /// It is a subclass of <see cref="CellIdBoolean"/> with an added block alias.
    /// </summary>
    internal sealed class QualifiedCellIdBoolean : CellIdBoolean
    {
        #region Constructor
        /// <summary>
        /// Creates a boolean of the form "<paramref name="block"/>.<paramref name="originalCellNum"/>".
        /// </summary>
        internal QualifiedCellIdBoolean(CqlBlock block, CqlIdentifiers identifiers, int originalCellNum)
            : base(identifiers, originalCellNum)
        {
            m_block = block;
        }
        #endregion
 
        #region Fields
        private readonly CqlBlock m_block;
        #endregion
 
        #region Methods
        internal override StringBuilder AsEsql(StringBuilder builder, string blockAlias, bool skipIsNotNull)
        {
            // QualifiedCellIdBoolean is only used during JOIN processing where there is no single input, hence blockAlias is expected to be null.
            Debug.Assert(blockAlias == null, "QualifiedCellIdBoolean: blockAlias mismatch");
            return base.AsEsql(builder, m_block.CqlAlias, skipIsNotNull);
        }
 
        internal override DbExpression AsCqt(DbExpression row, bool skipIsNotNull)
        {
            return base.AsCqt(m_block.GetInput(row), skipIsNotNull);
        }
        #endregion
    }
}