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//---------------------------------------------------------------------
// <copyright file="CellIdBoolean.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
namespace System.Data.Mapping.ViewGeneration.Structures
{
using System.Collections.Generic;
using System.Data.Common.CommandTrees;
using System.Data.Common.CommandTrees.ExpressionBuilder;
using System.Data.Mapping.ViewGeneration.CqlGeneration;
using System.Diagnostics;
using System.Text;
/// <summary>
/// Wraps from0, from1, etc. boolean fields that identify the source of tuples (# of respective cell query) in the view statements.
/// </summary>
internal class CellIdBoolean : TrueFalseLiteral
{
#region Constructor
/// <summary>
/// Creates a boolean expression for the variable name specified by <paramref name="index"/>, e.g., 0 results in from0, 1 into from1.
/// </summary>
internal CellIdBoolean(CqlIdentifiers identifiers, int index)
{
Debug.Assert(index >= 0);
m_index = index;
m_slotName = identifiers.GetFromVariable(index);
}
#endregion
#region Fields
/// <summary>
/// e.g., from0, from1.
/// </summary>
private readonly int m_index;
private readonly string m_slotName;
#endregion
#region Properties
/// <summary>
/// Returns the slotName corresponding to this, ie., _from0 etc.
/// </summary>
internal string SlotName
{
get { return m_slotName; }
}
#endregion
#region BoolLiteral members
internal override StringBuilder AsEsql(StringBuilder builder, string blockAlias, bool skipIsNotNull)
{
// Get e.g., T2._from1 using the table alias
string qualifiedName = CqlWriter.GetQualifiedName(blockAlias, SlotName);
builder.Append(qualifiedName);
return builder;
}
internal override DbExpression AsCqt(DbExpression row, bool skipIsNotNull)
{
// Get e.g., row._from1
return row.Property(SlotName);
}
internal override StringBuilder AsUserString(StringBuilder builder, string blockAlias, bool skipIsNotNull)
{
return AsEsql(builder, blockAlias, skipIsNotNull);
}
internal override StringBuilder AsNegatedUserString(StringBuilder builder, string blockAlias, bool skipIsNotNull)
{
builder.Append("NOT(");
builder = AsUserString(builder, blockAlias, skipIsNotNull);
builder.Append(")");
return builder;
}
internal override void GetRequiredSlots(MemberProjectionIndex projectedSlotMap, bool[] requiredSlots)
{
// The slot corresponding to from1, etc
int numBoolSlots = requiredSlots.Length - projectedSlotMap.Count;
int slotNum = projectedSlotMap.BoolIndexToSlot(m_index, numBoolSlots);
requiredSlots[slotNum] = true;
}
protected override bool IsEqualTo(BoolLiteral right)
{
CellIdBoolean rightBoolean = right as CellIdBoolean;
if (rightBoolean == null)
{
return false;
}
return m_index == rightBoolean.m_index;
}
public override int GetHashCode()
{
return m_index.GetHashCode();
}
internal override BoolLiteral RemapBool(Dictionary<MemberPath, MemberPath> remap)
{
return this;
}
#endregion
#region Other Methods
internal override void ToCompactString(StringBuilder builder)
{
builder.Append(SlotName);
}
#endregion
}
}
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