CaseCqlBlock.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / CqlGeneration / CaseCqlBlock.cs / 1305376 / CaseCqlBlock.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Data.Mapping.ViewGeneration.Structures; 
using System.Text;
using System.Collections.Generic;
using System.Data.Common.Utils;
using System.Diagnostics; 

namespace System.Data.Mapping.ViewGeneration.CqlGeneration 
{ 

    // A class to capture CqlBlocks responsible for case statements -- these 
    // are statements needed for generating the variables in the
    // multiconstants, i.e., complex types, entities, discriminators, etc
    internal class CaseCqlBlock : CqlBlock
    { 

        #region Constructors 
        // effects: Creates a case statememt CqlBlock with SELECT (slots), 
        // FROM (child -- note has only has one child), WHERE (true), AS
        // (blockAliasNum). caseSlot indicates which slot in slots 
        // corresponds to the single case statement being generated by this block
        internal CaseCqlBlock(SlotInfo[] slots, int caseSlot, CqlBlock child, BoolExpression whereClause, CqlIdentifiers identifiers, int blockAliasNum) :
            base(slots, new List(new CqlBlock[] { child }), whereClause, identifiers, blockAliasNum)
        { 
            m_caseSlotInfo = slots[caseSlot];
        } 
        #endregion 

        #region Fields 
        private SlotInfo m_caseSlotInfo;
        #endregion

        #region Methods 
        // effects: See CqlBlock.AsCql
        internal override StringBuilder AsCql(StringBuilder builder, bool isTopLevel, int indentLevel) 
        { 
            // The SELECT part
            StringUtil.IndentNewLine(builder, indentLevel); 
            // Since we know that the case statement starts on a new line, we
            // can add a comment after SELECT
            Debug.Assert(m_caseSlotInfo.MemberPath != null, "We only construct real slots not boolean slots");
 
            builder.Append("SELECT ");
            if (isTopLevel) 
            { 
                builder.Append("VALUE ");
            } 
            builder.Append("-- Constructing ")
                   .Append(m_caseSlotInfo.MemberPath.LeafEdmMemberName);

            Debug.Assert(Children.Count == 1, "Case can have exactly one child"); 
            CqlBlock childBlock = Children[0];
 
            // First emit the case statement "CASE ... END AS Alias" 
            m_caseSlotInfo.AsCql(builder, childBlock.CqlAlias, indentLevel);
            if (false == isTopLevel) 
            {
                builder.Append(" AS ")
                       .Append(m_caseSlotInfo.CqlFieldAlias);
            } 

            // Now get the remaining slots 
            bool isFirst = true; 
            // CHANGE_[....]_IMPROVE: Try to leverage GenerateProjectedtList
            foreach (SlotInfo slot in Slots) 
            {
                if (false == slot.IsRequiredByParent || object.ReferenceEquals(slot, m_caseSlotInfo))
                {
                    continue; 
                }
                if (isFirst == true) 
                { 
                    // Add , after END and then start new line for first field
                    builder.Append(", "); 
                    StringUtil.IndentNewLine(builder, indentLevel + 1);
                }
                else
                { 
                    // Simply add a comma for the next field
                    builder.Append(", "); 
                } 

                slot.AsCql(builder, childBlock.CqlAlias, indentLevel); 
                isFirst = false;
            }

            // The FROM part: FROM (ChildView) AS AliasName 
            StringUtil.IndentNewLine(builder, indentLevel);
            builder.Append("FROM ("); 
            // Get the child 

            childBlock.AsCql(builder, false, indentLevel + 1); 
            StringUtil.IndentNewLine(builder, indentLevel);
            builder.Append(") AS ")
                   .Append(childBlock.CqlAlias);
 
            // Get the WHERE part only when the expression is not simply TRUE
            if (false == BoolExpression.EqualityComparer.Equals(WhereClause, BoolExpression.True)) 
            { 
                StringUtil.IndentNewLine(builder, indentLevel);
                builder.Append("WHERE "); 
                WhereClause.AsCql(builder, childBlock.CqlAlias);
            }

            return builder; 
        }
        #endregion 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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