Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Entity/System/Data/Common/CommandTrees/DbDeleteCommandTree.cs

@@ -0,0 +1,89 @@
+//---------------------------------------------------------------------
+// <copyright file="DbDeleteCommandTree.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner  [....], [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+using System;
+using System.Collections.Generic;
+
+using System.Data.Metadata.Edm;
+using System.Data.Common.CommandTrees.Internal;
+using System.Data.Common.Utils;
+
+namespace System.Data.Common.CommandTrees
+{
+    /// <summary>
+    /// Represents a single row delete operation expressed as a canonical command tree.
+    /// </summary>
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
+    public sealed class DbDeleteCommandTree : DbModificationCommandTree
+    {
+        private readonly DbExpression _predicate;
+
+        internal DbDeleteCommandTree(MetadataWorkspace metadata, DataSpace dataSpace, DbExpressionBinding target, DbExpression predicate)
+            : base(metadata, dataSpace, target)
+        {
+            EntityUtil.CheckArgumentNull(predicate, "predicate");
+
+            this._predicate = predicate;
+        }
+
+        /// <summary>
+        /// Gets an <see cref="DbExpression"/> that specifies the predicate used to determine which members of the target collection should be deleted.
+        /// </summary>
+        /// <remarks>
+        /// The predicate can include only the following elements:
+        /// <list>
+        /// <item>Equality expression</item>
+        /// <item>Constant expression</item>
+        /// <item>IsNull expression</item>
+        /// <item>Property expression</item>
+        /// <item>Reference expression to the target</item>
+        /// <item>And expression</item>
+        /// <item>Or expression</item>
+        /// <item>Not expression</item>
+        /// </list>
+        /// </remarks>
+        public DbExpression Predicate
+        {   
+            get
+            {
+                return _predicate;
+            }
+        }
+
+        internal override DbCommandTreeKind CommandTreeKind
+        {
+            get { return DbCommandTreeKind.Delete; }
+        }
+
+        internal override bool HasReader
+        {
+            get 
+            {
+                // a delete command never returns server-gen values, and
+                // therefore never returns a reader
+                return false; 
+            }
+        }
+
+        internal override void DumpStructure(ExpressionDumper dumper)
+        {
+            base.DumpStructure(dumper);
+
+            if (this.Predicate != null)
+            {
+                dumper.Dump(this.Predicate, "Predicate");
+            }
+        }
+
+        internal override string PrintTree(ExpressionPrinter printer)
+        {
+            return printer.Print(this); 
+        }
+    }
+}