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90 lines
3.2 KiB
C#
90 lines
3.2 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="CommandPlan.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;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Data.Common;
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using md = System.Data.Metadata.Edm;
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using cqt = System.Data.Common.CommandTrees;
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//using System.Diagnostics; // Please use PlanCompiler.Assert instead of Debug.Assert in this class...
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// It is fine to use Debug.Assert in cases where you assert an obvious thing that is supposed
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// to prevent from simple mistakes during development (e.g. method argument validation
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// in cases where it was you who created the variables or the variables had already been validated or
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// in "else" clauses where due to code changes (e.g. adding a new value to an enum type) the default
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// "else" block is chosen why the new condition should be treated separately). This kind of asserts are
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// (can be) helpful when developing new code to avoid simple mistakes but have no or little value in
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// the shipped product.
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// PlanCompiler.Assert *MUST* be used to verify conditions in the trees. These would be assumptions
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// about how the tree was built etc. - in these cases we probably want to throw an exception (this is
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// what PlanCompiler.Assert does when the condition is not met) if either the assumption is not correct
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// or the tree was built/rewritten not the way we thought it was.
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// Use your judgment - if you rather remove an assert than ship it use Debug.Assert otherwise use
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// PlanCompiler.Assert.
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//
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// A CommandPlan represents the plan for a query.
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//
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namespace System.Data.Query.PlanCompiler
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{
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#region CommandInfo
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/// <summary>
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/// Captures information about a single provider command
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/// </summary>
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internal sealed class ProviderCommandInfo
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{
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#region public apis
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/// <summary>
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/// Internal methods to get the command tree
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/// </summary>
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internal cqt.DbCommandTree CommandTree
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{
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get { return _commandTree; }
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}
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#endregion
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#region private state
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private cqt.DbCommandTree _commandTree;
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private ProviderCommandInfo _parent;
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private List<ProviderCommandInfo> _children;
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#endregion
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#region constructors
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/// <summary>
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/// Internal constructor for a ProviderCommandInfo object
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/// </summary>
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/// <param name="commandTree">command tree for the provider command</param>
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/// <param name="children">children command infos</param>
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internal ProviderCommandInfo(cqt.DbCommandTree commandTree,
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List<ProviderCommandInfo> children)
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{
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_commandTree = commandTree;
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_children = children;
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if (_children == null)
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{
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_children = new List<ProviderCommandInfo>();
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}
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foreach (ProviderCommandInfo child in _children)
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{
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child._parent = this;
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}
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}
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#endregion
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}
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#endregion
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}
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