CqlBlock.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / CqlGeneration / CqlBlock.cs / 2 / CqlBlock.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

 
using System.Data.Common.Utils;
using System.Collections.Generic;
using System.Data.Mapping.ViewGeneration.Structures;
using System.Collections.ObjectModel; 
using System.Text;
using System.Diagnostics; 
 
namespace System.Data.Mapping.ViewGeneration.CqlGeneration {
 
    // A class that holds an expression of the form SELECT .. FROM .. WHERE
    // Essentially, it is a structure allows us to generate Cql query in a
    // localized manner, i.e., all global decisions about nulls, constants,
    // case statements, etc have already been made 
    internal abstract class CqlBlock : InternalBase {
 
        // effects: Initializes a CqlBlock with the SELECT (slotinfos), FROM 
        // (children), WHERE (whereClause), AS (blockAliasNum)
        protected CqlBlock(SlotInfo[] slotInfos, List children, 
                           BoolExpression whereClause, CqlIdentifiers identifiers, int blockAliasNum) {
            m_slots = new ReadOnlyCollection(slotInfos);
            m_children = new ReadOnlyCollection(children);
            m_whereClause = whereClause; 
            m_blockAlias = identifiers.GetBlockAlias(blockAliasNum);
        } 
 
        #region Fields
        private ReadOnlyCollection m_slots; // essentially, SELECT 
        private ReadOnlyCollection m_children; // FROM
        private BoolExpression m_whereClause; // WHERE
        private string         m_blockAlias; // AS ... for cql generation
        #endregion 

        #region Properties 
        // effects: Returns the slot being projected at slotNum. If no slot 
        // is being projected, returns null
        internal ProjectedSlot ProjectedSlot(int slotNum) { 
            Debug.Assert(slotNum < m_slots.Count, "Slotnum too high");
            return m_slots[slotNum].SlotValue;
        }
 
        // effects: Returns the whereclause of this block (WHERE)
        protected BoolExpression WhereClause { 
            get { return m_whereClause; } 
        }
 
        // effects: Returns all the child blocks of this block (FROM)
        protected ReadOnlyCollection Children {
            get { return m_children; }
        } 

        // effects: Returns all the slots for this block (SELECT) 
        internal ReadOnlyCollection Slots { 
            get { return m_slots; }
            set { m_slots = value; } 
        }
        #endregion

        #region Abstract Methods 
        // effects: Returns a string corresponding to the Cql representation
        // of this block (and its children below). 
        internal abstract StringBuilder AsCql(StringBuilder builder, bool isTopLevel, int indentLevel); 
        #endregion
 
        #region Methods
        // effects: Returns a string that has an alias for the FROM part of
        // this block or the whole block itself that can be used for "AS"
        internal string CqlAlias { 
            get { return m_blockAlias;}
        } 
 
        // effects: Returns true iff slotNum is being projected by this block
        internal bool IsProjected(int slotNum) { 
            Debug.Assert(slotNum < m_slots.Count, "Slotnum too high");
            return m_slots[slotNum].IsProjected;
        }
 
        // effects: Generates a "SELECT A, B, C, .." for all the slots in this
        // if asForCaseStatementsOnly is true, generates aliases, ie., foo AS 
        // bar for CaseStatements only. Otherwise, generates them for all slots 
        protected void GenerateProjectedtList(StringBuilder builder, int indentLevel,
                                              string blockAlias, bool asForCaseStatementsOnly) { 
            StringUtil.IndentNewLine(builder, indentLevel);
            builder.Append("SELECT ");

            List projectedExpressions = new List(); 
            bool isFirst = true;
            foreach (SlotInfo slotInfo in Slots) { 
                if (false == slotInfo.IsRequiredByParent) { 
                    // Ignore slots that are not needed
                    continue; 
                }
                if (isFirst == false) {
                    builder.Append(", ");
                } 

                // Note: We call AsCql and not AliasName on 
                // slotInfo since we do want to pick the right reference to 
                // the slot from the appropriate child
                if (false == asForCaseStatementsOnly) { 
                    StringUtil.IndentNewLine(builder, indentLevel + 1);
                }
                slotInfo.AsCql(builder, blockAlias, indentLevel);
 
                // Print the field alias for constants (booleans and regular constants). Also
                // case statements need the alias as well. 
                // We also add it for extent cql blocks for all fields and 
                // finally we need  IS NOT NULL for boolean conditions
 
                if (slotInfo.SlotValue is CaseStatementSlot ||
                    slotInfo.SlotValue is BooleanProjectedSlot ||
                    slotInfo.SlotValue is ConstantSlot ||
                    asForCaseStatementsOnly == false || 
                    slotInfo.IsEnforcedNotNull) {
 
                    builder.Append(" AS ") 
                           .Append(slotInfo.CqlFieldAlias);
                } 
                isFirst = false;
            }

            // Get the slots as A, B, C, ... 
            StringUtil.ToSeparatedString(builder, projectedExpressions, ", ", null);
            StringUtil.IndentNewLine(builder, indentLevel); 
        } 

        internal override void ToCompactString(StringBuilder builder) { 
            for (int i = 0; i < m_slots.Count; i++) {
                StringUtil.FormatStringBuilder(builder, "{0}: ", i);
                m_slots[i].ToCompactString(builder);
                builder.Append(' '); 
            }
            m_whereClause.ToCompactString(builder); 
        } 
        #endregion
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

 
using System.Data.Common.Utils;
using System.Collections.Generic;
using System.Data.Mapping.ViewGeneration.Structures;
using System.Collections.ObjectModel; 
using System.Text;
using System.Diagnostics; 
 
namespace System.Data.Mapping.ViewGeneration.CqlGeneration {
 
    // A class that holds an expression of the form SELECT .. FROM .. WHERE
    // Essentially, it is a structure allows us to generate Cql query in a
    // localized manner, i.e., all global decisions about nulls, constants,
    // case statements, etc have already been made 
    internal abstract class CqlBlock : InternalBase {
 
        // effects: Initializes a CqlBlock with the SELECT (slotinfos), FROM 
        // (children), WHERE (whereClause), AS (blockAliasNum)
        protected CqlBlock(SlotInfo[] slotInfos, List children, 
                           BoolExpression whereClause, CqlIdentifiers identifiers, int blockAliasNum) {
            m_slots = new ReadOnlyCollection(slotInfos);
            m_children = new ReadOnlyCollection(children);
            m_whereClause = whereClause; 
            m_blockAlias = identifiers.GetBlockAlias(blockAliasNum);
        } 
 
        #region Fields
        private ReadOnlyCollection m_slots; // essentially, SELECT 
        private ReadOnlyCollection m_children; // FROM
        private BoolExpression m_whereClause; // WHERE
        private string         m_blockAlias; // AS ... for cql generation
        #endregion 

        #region Properties 
        // effects: Returns the slot being projected at slotNum. If no slot 
        // is being projected, returns null
        internal ProjectedSlot ProjectedSlot(int slotNum) { 
            Debug.Assert(slotNum < m_slots.Count, "Slotnum too high");
            return m_slots[slotNum].SlotValue;
        }
 
        // effects: Returns the whereclause of this block (WHERE)
        protected BoolExpression WhereClause { 
            get { return m_whereClause; } 
        }
 
        // effects: Returns all the child blocks of this block (FROM)
        protected ReadOnlyCollection Children {
            get { return m_children; }
        } 

        // effects: Returns all the slots for this block (SELECT) 
        internal ReadOnlyCollection Slots { 
            get { return m_slots; }
            set { m_slots = value; } 
        }
        #endregion

        #region Abstract Methods 
        // effects: Returns a string corresponding to the Cql representation
        // of this block (and its children below). 
        internal abstract StringBuilder AsCql(StringBuilder builder, bool isTopLevel, int indentLevel); 
        #endregion
 
        #region Methods
        // effects: Returns a string that has an alias for the FROM part of
        // this block or the whole block itself that can be used for "AS"
        internal string CqlAlias { 
            get { return m_blockAlias;}
        } 
 
        // effects: Returns true iff slotNum is being projected by this block
        internal bool IsProjected(int slotNum) { 
            Debug.Assert(slotNum < m_slots.Count, "Slotnum too high");
            return m_slots[slotNum].IsProjected;
        }
 
        // effects: Generates a "SELECT A, B, C, .." for all the slots in this
        // if asForCaseStatementsOnly is true, generates aliases, ie., foo AS 
        // bar for CaseStatements only. Otherwise, generates them for all slots 
        protected void GenerateProjectedtList(StringBuilder builder, int indentLevel,
                                              string blockAlias, bool asForCaseStatementsOnly) { 
            StringUtil.IndentNewLine(builder, indentLevel);
            builder.Append("SELECT ");

            List projectedExpressions = new List(); 
            bool isFirst = true;
            foreach (SlotInfo slotInfo in Slots) { 
                if (false == slotInfo.IsRequiredByParent) { 
                    // Ignore slots that are not needed
                    continue; 
                }
                if (isFirst == false) {
                    builder.Append(", ");
                } 

                // Note: We call AsCql and not AliasName on 
                // slotInfo since we do want to pick the right reference to 
                // the slot from the appropriate child
                if (false == asForCaseStatementsOnly) { 
                    StringUtil.IndentNewLine(builder, indentLevel + 1);
                }
                slotInfo.AsCql(builder, blockAlias, indentLevel);
 
                // Print the field alias for constants (booleans and regular constants). Also
                // case statements need the alias as well. 
                // We also add it for extent cql blocks for all fields and 
                // finally we need  IS NOT NULL for boolean conditions
 
                if (slotInfo.SlotValue is CaseStatementSlot ||
                    slotInfo.SlotValue is BooleanProjectedSlot ||
                    slotInfo.SlotValue is ConstantSlot ||
                    asForCaseStatementsOnly == false || 
                    slotInfo.IsEnforcedNotNull) {
 
                    builder.Append(" AS ") 
                           .Append(slotInfo.CqlFieldAlias);
                } 
                isFirst = false;
            }

            // Get the slots as A, B, C, ... 
            StringUtil.ToSeparatedString(builder, projectedExpressions, ", ", null);
            StringUtil.IndentNewLine(builder, indentLevel); 
        } 

        internal override void ToCompactString(StringBuilder builder) { 
            for (int i = 0; i < m_slots.Count; i++) {
                StringUtil.FormatStringBuilder(builder, "{0}: ", i);
                m_slots[i].ToCompactString(builder);
                builder.Append(' '); 
            }
            m_whereClause.ToCompactString(builder); 
        } 
        #endregion
    } 
}

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