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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / Structures / ScalarConstant.cs / 1305376 / ScalarConstant.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Text; using System.Data.Common.Utils; using System.Data.Mapping.ViewGeneration.CqlGeneration; using System.Data.Mapping.ViewGeneration.Utils; using System.Data.Metadata.Edm; namespace System.Data.Mapping.ViewGeneration.Structures { // A class that denotes a constant value that can be stored in a // multiconstant or in a projected slot of a cellquery internal class ScalarConstant : Constant { #region Constructor // effects: Creates a scalar constant corresponding to value internal ScalarConstant(object value) { m_scalar = value; } #endregion #region Fields private object m_scalar; // The actual value of the scalar #endregion #region Properties internal object Value { get { return m_scalar; } } #endregion #region Methods // effects: See CellConstant.AsCql internal override StringBuilder AsCql(StringBuilder builder, MemberPath outputMember, string blockAlias) { // A constant path better be more than just the extent EdmType constType = Helper.GetModelTypeUsage(outputMember.LeafEdmMember).EdmType; // Some built-in constants if (BuiltInTypeKind.PrimitiveType == constType.BuiltInTypeKind) { PrimitiveTypeKind primitiveTypeKind = ((PrimitiveType)constType).PrimitiveTypeKind; if (primitiveTypeKind == PrimitiveTypeKind.Boolean) { // This better be a boolean. Else we crash! bool val = (bool)m_scalar; string value = StringUtil.FormatInvariant("{0}", val); builder.Append(value); return builder; } else if (primitiveTypeKind == PrimitiveTypeKind.String) { // It's a string: no need to cast AppendEscapedScalar(builder); return builder; } } else if (BuiltInTypeKind.EnumType == constType.BuiltInTypeKind) { // Enumerated type - we should be able to cast it EnumMember enumValue = (EnumMember)m_scalar; builder.Append(enumValue.Name); return builder; } // Need to cast builder.Append("CAST("); AppendEscapedScalar(builder); builder.Append(" AS "); CqlWriter.AppendEscapedTypeName(builder, constType); builder.Append(')'); return builder; } // effects: Modifies builder to contain an escaped version of this private StringBuilder AppendEscapedScalar(StringBuilder builder) { string value = StringUtil.FormatInvariant("{0}", m_scalar); if (value.Contains("'")) { // Deal with strings with ' by doubling it value = value.Replace("'", "''"); } StringUtil.FormatStringBuilder(builder, "'{0}'", value); return builder; } // Returns true if this is semantically equivalent to obj protected override bool IsEqualTo(Constant right) { ScalarConstant rightScalarConstant = right as ScalarConstant; if (rightScalarConstant == null) { return false; } return ByValueEqualityComparer.Default.Equals(m_scalar, rightScalarConstant.m_scalar); } protected override int GetHash() { if (m_scalar == null) { return 1; } else { return m_scalar.GetHashCode(); } } private void InternalToString(StringBuilder builder, bool isInvariant) { EnumMember enumMember = m_scalar as EnumMember; if (enumMember != null) { builder.Append(enumMember.Name); } else if (m_scalar == null) { builder.Append(isInvariant ? "NULL" : System.Data.Entity.Strings.ViewGen_Null); } else { builder.Append(StringUtil.FormatInvariant("'{0}'", m_scalar)); } } internal override string ToUserString() { StringBuilder builder = new StringBuilder(); InternalToString(builder, false); return builder.ToString(); } internal override void ToCompactString(StringBuilder builder) { InternalToString(builder, true); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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