70 lines
2.6 KiB
C#
70 lines
2.6 KiB
C#
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//---------------------------------------------------------------------
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// <copyright file="UnionCqlBlock.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner [....]
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// @backupOwner [....]
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//---------------------------------------------------------------------
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using System.Collections.Generic;
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using System.Text;
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using System.Data.Mapping.ViewGeneration.Structures;
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using System.Data.Common.CommandTrees;
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using System.Data.Common.CommandTrees.ExpressionBuilder;
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using System.Data.Common.Utils;
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using System.Diagnostics;
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namespace System.Data.Mapping.ViewGeneration.CqlGeneration
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{
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/// <summary>
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/// Represents Union nodes in the <see cref="CqlBlock"/> tree.
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/// </summary>
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internal sealed class UnionCqlBlock : CqlBlock
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{
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#region Constructor
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/// <summary>
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/// Creates a union block with SELECT (<paramref name="slotInfos"/>), FROM (<paramref name="children"/>), WHERE (true), AS (<paramref name="blockAliasNum"/>).
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/// </summary>
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internal UnionCqlBlock(SlotInfo[] slotInfos, List<CqlBlock> children, CqlIdentifiers identifiers, int blockAliasNum)
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: base(slotInfos, children, BoolExpression.True, identifiers, blockAliasNum)
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{ }
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#endregion
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#region Methods
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internal override StringBuilder AsEsql(StringBuilder builder, bool isTopLevel, int indentLevel)
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{
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Debug.Assert(this.Children.Count > 0, "UnionCqlBlock: Children collection must not be empty");
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// Simply get the Cql versions of the children and add the union operator between them.
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bool isFirst = true;
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foreach (CqlBlock child in Children)
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{
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if (false == isFirst)
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{
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StringUtil.IndentNewLine(builder, indentLevel + 1);
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builder.Append(OpCellTreeNode.OpToEsql(CellTreeOpType.Union));
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}
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isFirst = false;
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builder.Append(" (");
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child.AsEsql(builder, isTopLevel, indentLevel + 1);
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builder.Append(')');
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}
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return builder;
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}
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internal override DbExpression AsCqt(bool isTopLevel)
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{
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Debug.Assert(this.Children.Count > 0, "UnionCqlBlock: Children collection must not be empty");
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DbExpression cqt = this.Children[0].AsCqt(isTopLevel);
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for (int i = 1; i < this.Children.Count; ++i)
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{
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cqt = cqt.UnionAll(this.Children[i].AsCqt(isTopLevel));
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}
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return cqt;
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}
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#endregion
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}
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}
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