Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataEntity / System / Data / Common / CommandTrees / OperatorExpressions.cs / 1 / OperatorExpressions.cs
//----------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// @owner [....], [....]
//---------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Data.Common;
using System.Data.Metadata.Edm;
using System.Data.Common.CommandTrees.Internal;
namespace System.Data.Common.CommandTrees
{
#region Boolean Operators
///
/// Represents the logical And of two Boolean arguments.
///
/// DbAndExpression requires that both of its arguments have a Boolean result type
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbAndExpression : DbBinaryExpression
{
internal DbAndExpression(DbCommandTree commandTree, DbExpression left, DbExpression right)
: base(commandTree, DbExpressionKind.And)
{
EntityUtil.CheckArgumentNull(left, "Left");
EntityUtil.CheckArgumentNull(right, "Right");
TypeUsage resultType = TypeHelpers.GetCommonTypeUsage(left.ResultType, right.ResultType);
if (null == resultType || !TypeSemantics.IsPrimitiveType(resultType, PrimitiveTypeKind.Boolean))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_And_BooleanArgumentsRequired);
}
//
// Apply constraints to the left and right arguments and set initial values
//
this.LeftLink.SetExpectedType(left.ResultType);
this.LeftLink.InitializeValue(left);
this.RightLink.SetExpectedType(right.ResultType);
this.RightLink.InitializeValue(right);
//
// Result Type is always Boolean
//
this.ResultType = resultType;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the logical Or of two Boolean arguments.
///
/// DbOrExpression requires that both of its arguments have a Boolean result type
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbOrExpression : DbBinaryExpression
{
internal DbOrExpression(DbCommandTree commandTree, DbExpression left, DbExpression right)
: base(commandTree, DbExpressionKind.Or)
{
EntityUtil.CheckArgumentNull(left, "Left");
EntityUtil.CheckArgumentNull(right, "Right");
TypeUsage resultType = TypeHelpers.GetCommonTypeUsage(left.ResultType, right.ResultType);
if (null == resultType || !TypeSemantics.IsPrimitiveType(resultType, PrimitiveTypeKind.Boolean))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Or_BooleanArgumentsRequired);
}
//
// Apply constraints to the left and right arguments and set initial values
//
this.LeftLink.SetExpectedType(left.ResultType);
this.LeftLink.InitializeValue(left);
this.RightLink.SetExpectedType(right.ResultType);
this.RightLink.InitializeValue(right);
//
// Result Type is always Boolean
//
this.ResultType = resultType;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the logical Not of a single Boolean argument.
///
/// DbNotExpression requires that its argument has a Boolean result type
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbNotExpression : DbUnaryExpression
{
internal DbNotExpression(DbCommandTree commandTree, DbExpression arg)
: base(commandTree, DbExpressionKind.Not)
{
EntityUtil.CheckArgumentNull(arg, "Argument");
//
// Argument to Not must have Boolean result type
//
if (!TypeSemantics.IsPrimitiveType(arg.ResultType, PrimitiveTypeKind.Boolean))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Not_BooleanArgumentRequired);
}
this.ArgumentLink.SetExpectedType(arg.ResultType);
this.ArgumentLink.InitializeValue(arg);
this.ResultType = arg.ResultType;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
#endregion
///
/// Represents an arithmetic operation (addition, subtraction, multiplication, division, modulo or negation) applied to two numeric arguments.
///
/// DbArithmeticExpression requires that its arguments have a common numeric result type
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbArithmeticExpression : DbExpression
{
private readonly ExpressionList _args;
internal DbArithmeticExpression(DbCommandTree commandTree, DbExpressionKind kind, IList args)
: base(commandTree, kind)
{
EntityUtil.CheckArgumentNull(args, "args");
Debug.Assert(
DbExpressionKind.Divide == kind ||
DbExpressionKind.Minus == kind ||
DbExpressionKind.Modulo == kind ||
DbExpressionKind.Multiply == kind ||
DbExpressionKind.Plus == kind ||
DbExpressionKind.UnaryMinus == kind,
"Invalid DbExpressionKind used in DbArithmeticExpression: " + Enum.GetName(typeof(DbExpressionKind), kind)
);
Debug.Assert(
(DbExpressionKind.UnaryMinus == kind && 1 == args.Count) ||
2 == args.Count,
"Incorrect number of arguments specified to DbArithmeticExpression"
);
//
// Construct a new ExpressionList to contain the arguments
//
ExpressionList argList = new ExpressionList("Arguments", commandTree, args.Count);
//
// Set the current elements without constraining the expected element type
//
argList.SetElements(args);
//
// Ensure that a numeric common type exists for the arguments
//
TypeUsage commonType = argList.GetCommonElementType();
if (TypeSemantics.IsNullOrNullType(commonType) || !TypeSemantics.IsNumericType(commonType))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Arithmetic_NumericCommonType);
}
//
// Constrain the type of elements in the list to the common numeric type
//
argList.SetExpectedElementType(commonType);
this._args = argList;
this.ResultType = commonType;
}
///
/// Gets the list of expressions that define the current arguments.
///
///
/// The Arguments property returns a fixed-size list of Arguments list
/// have a common numeric result type.
///
public IList Arguments { get { return _args; } }
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents a Case When...Then...Else logical operation.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbCaseExpression : DbExpression
{
private ExpressionList _when;
private ExpressionList _then;
private ExpressionLink _else;
internal DbCaseExpression(DbCommandTree cmdTree, IList whens, IList thens, DbExpression elseExpr)
: base(cmdTree, DbExpressionKind.Case)
{
//
// Whens/Thens cannot be null
// (nor can Else, but this is enforced when the
// ExpressionLink for the Else property is created, below).
//
EntityUtil.CheckArgumentNull(whens, "whens");
EntityUtil.CheckArgumentNull(thens, "thens");
//
// The number of 'When's must equal the number of 'Then's.
//
if (whens.Count != thens.Count)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Case_WhensMustEqualThens);
}
//
// There must be at least one clause in the case expression.
//
if (0 == whens.Count)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Case_AtLeastOneClause);
}
//
// All 'When's must produce a Boolean result, and a common (non-null) result type must exist
//
TypeUsage resultType = null;
for(int idx = 0; idx < whens.Count; idx++)
{
if (null == thens[idx])
{
throw EntityUtil.ArgumentNull(CommandTreeUtils.FormatIndex("Thens", idx));
}
if (null == resultType)
{
resultType = thens[idx].ResultType;
}
else
{
resultType = TypeHelpers.GetCommonTypeUsage(thens[idx].ResultType, resultType);
if (null == resultType)
{
break;
}
}
}
if (resultType != null && elseExpr != null)
{
resultType = TypeHelpers.GetCommonTypeUsage(elseExpr.ResultType, resultType);
}
if (TypeSemantics.IsNullOrNullType(resultType))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Case_InvalidResultType);
}
//
// Initialize the When clauses. Elements must be promotable to Boolean.
// NullType is specifically not allowed as the Type of a When element.
//
_when = new ExpressionList("When", cmdTree, PrimitiveTypeKind.Boolean, whens);
//
// Initialize the Then clauses. Elements must be promotable to the common result type.
//
_then = new ExpressionList("Then", cmdTree, resultType, thens);
//
// Initialize the Else clause. Values must be promotable to the common result type.
//
_else = new ExpressionLink("Else", cmdTree, resultType, elseExpr);
//
// The result type of DbCaseExpression is the common result type
//
this.ResultType = resultType;
}
///
/// Gets the When clauses of this DbCaseExpression.
///
public IList When { get { return _when; } }
///
/// Gets the Then clauses of this DbCaseExpression.
///
public IList Then { get { return _then; } }
///
/// Gets or sets the Else clause of this DbCaseExpression.
///
/// The expression is null
///
/// The expression is not associated with the DbCaseExpression's command tree,
/// or its result type is not equal or promotable to the result type of the DbCaseExpression
///
public DbExpression Else { get { return _else.Expression; } /*CQT_PUBLIC_API(*/internal/*)*/ set { _else.Expression = value; } }
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents a cast operation applied to a polymorphic argument.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbCastExpression : DbUnaryExpression
{
internal DbCastExpression(DbCommandTree cmdTree, TypeUsage type, DbExpression arg)
: base(cmdTree, DbExpressionKind.Cast)
{
//
// Verify the type to cast to. Casting to NullType is not allowed
//
cmdTree.TypeHelper.CheckType(type);
//
// Verify that the cast is allowed
//
if (!TypeSemantics.IsCastAllowed(arg.ResultType, type))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Cast_InvalidCast(TypeHelpers.GetFullName(arg.ResultType), TypeHelpers.GetFullName(type)));
}
//
// Set the Argument constraints and initialize the argument value
//
this.ArgumentLink.InitializeValue(arg);
this.ArgumentLink.SetExpectedType(arg.ResultType);
this.ResultType = type;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents a comparison operation (equality, greater than, greather than or equal, less than, less than or equal, inequality) applied to two arguments.
///
///
/// DbComparisonExpression requires that its arguments have a common result type
/// that is equality comparable (for
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbComparisonExpression : DbBinaryExpression
{
internal DbComparisonExpression(DbCommandTree commandTree, DbExpressionKind kind, DbExpression left, DbExpression right)
: base(commandTree, kind)
{
Debug.Assert(
DbExpressionKind.Equals == kind ||
DbExpressionKind.LessThan == kind ||
DbExpressionKind.LessThanOrEquals == kind ||
DbExpressionKind.GreaterThan == kind ||
DbExpressionKind.GreaterThanOrEquals == kind ||
DbExpressionKind.NotEquals == kind,
"Invalid DbExpressionKind used in DbComparisonExpression: " + Enum.GetName(typeof(DbExpressionKind), kind)
);
//
// Initialize the Left and Right arguments to perform Null value and NullType checking
//
this.LeftLink.InitializeValue(left);
this.RightLink.InitializeValue(right);
//
// Ensure that the types of the arguments are comparable
//
this.CheckComparison(left, right);
//
// Register for notifications that the left or right argument is changing.
// The arguments can be freely substituted provided that when a value is changed,
// the result type of the new expression value and the result type of the unchanged argument are comparable.
//
this.LeftLink.ValueChanging += new ExpressionLinkConstraint(this.ArgumentChanging);
this.RightLink.ValueChanging += new ExpressionLinkConstraint(this.ArgumentChanging);
//
// Result Type is always Boolean
//
this.ResultType = commandTree.TypeHelper.CreateBooleanResultType();
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
private void ArgumentChanging(ExpressionLink link, DbExpression newValue)
{
//
// If the Left expression is changing then the Right expression should be compared
// to the new value, and vice-versa.
//
if (this.LeftLink == link)
{
this.CheckComparison(newValue, this.Right);
}
else
{
this.CheckComparison(this.Left, newValue);
}
}
private void CheckComparison(DbExpression left, DbExpression right)
{
//
// A comparison of the specified kind must exist between the left and right arguments
//
bool equality = true;
bool order = true;
if (DbExpressionKind.GreaterThanOrEquals == this.ExpressionKind ||
DbExpressionKind.LessThanOrEquals == this.ExpressionKind)
{
equality = TypeSemantics.IsEqualComparableTo(left.ResultType, right.ResultType);
order = TypeSemantics.IsOrderComparableTo(left.ResultType, right.ResultType);
}
else if (DbExpressionKind.Equals == this.ExpressionKind ||
DbExpressionKind.NotEquals == this.ExpressionKind)
{
equality = TypeSemantics.IsEqualComparableTo(left.ResultType, right.ResultType);
}
else
{
order = TypeSemantics.IsOrderComparableTo(left.ResultType, right.ResultType);
}
if(!equality || !order)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Comparison_ComparableRequired);
}
}
}
///
/// Represents empty set determination applied to a single set argument.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbIsEmptyExpression : DbUnaryExpression
{
internal DbIsEmptyExpression(DbCommandTree cmdTree, DbExpression arg)
: base(cmdTree, DbExpressionKind.IsEmpty, arg)
{
//
// Ensure that the Argument is of a collection type
//
this.CheckCollectionArgument();
//
// Result Type is always Boolean
//
this.ResultType = cmdTree.TypeHelper.CreateBooleanResultType();
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents null determination applied to a single argument.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbIsNullExpression : DbUnaryExpression
{
internal DbIsNullExpression(DbCommandTree cmdTree, DbExpression arg, bool isRowTypeArgumentAllowed)
: base(cmdTree, DbExpressionKind.IsNull)
{
//
// The argument cannot be of a collection type
//
if (TypeSemantics.IsCollectionType(arg.ResultType))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_IsNull_CollectionNotAllowed);
}
//
// ensure argument type is valid for this operation
//
if (!TypeHelpers.IsValidIsNullOpType(arg.ResultType) && (!isRowTypeArgumentAllowed || !TypeSemantics.IsRowType(arg.ResultType)))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_IsNull_InvalidType);
}
//
// Set the Argument constraints and initialize the Argument value
// ArgumentLink.SetExpectedType is not called - any expression can be substituted freely for the argument expression
//
this.ArgumentLink.InitializeValue(arg);
//
// Result Type is always Boolean
//
this.ResultType = cmdTree.TypeHelper.CreateBooleanResultType();
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the type comparison of a single argument against the specified type.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbIsOfExpression : DbUnaryExpression
{
private TypeUsage _ofType;
internal DbIsOfExpression(DbCommandTree cmdTree, DbExpressionKind isOfKind, TypeUsage type, DbExpression arg)
: base(cmdTree, isOfKind)
{
Debug.Assert(DbExpressionKind.IsOf == this.ExpressionKind || DbExpressionKind.IsOfOnly == this.ExpressionKind, string.Format(CultureInfo.InvariantCulture, "Invalid DbExpressionKind used in DbIsOfExpression: {0}", Enum.GetName(typeof(DbExpressionKind), this.ExpressionKind)));
//
// Ensure the ofType is non-null, associated with the correct metadata workspace/dataspace,
// is not NullType, and is polymorphic
//
cmdTree.TypeHelper.CheckPolymorphicType(type);
//
// Verify that the IsOf operation is allowed
//
if (!TypeSemantics.IsValidPolymorphicCast(arg.ResultType, type))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_General_PolymorphicArgRequired(this.GetType().Name));
}
_ofType = type;
//
// Set the Argument constraints and initialize the Argument value
//
this.ArgumentLink.SetExpectedType(arg.ResultType);
this.ArgumentLink.InitializeValue(arg);
//
// Return type is always Boolean
//
this.ResultType = cmdTree.TypeHelper.CreateBooleanResultType();
}
///
/// Gets the type metadata that the type metadata of the argument should be compared to.
///
public TypeUsage OfType
{
get { return _ofType; }
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the retrieval of elements of the specified type from the given set argument.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbOfTypeExpression : DbUnaryExpression
{
private TypeUsage _ofType;
internal DbOfTypeExpression(DbCommandTree cmdTree, DbExpressionKind ofTypeKind, TypeUsage type, DbExpression arg)
: base(cmdTree, ofTypeKind, arg)
{
Debug.Assert(DbExpressionKind.OfType == ofTypeKind ||
DbExpressionKind.OfTypeOnly == ofTypeKind,
"ExpressionKind for DbOfTypeExpression must be OfType or OfTypeOnly");
//
// Ensure that the type is non-null and valid - from the same metadata collection and dataspace and the command tree.
// The type is also not allowed to be NullType.
//
cmdTree.TypeHelper.CheckPolymorphicType(type);
//
// Ensure that the argument is actually of a collection type.
//
this.CheckCollectionArgument();
//
// Verify that the OfType operation is allowed
//
#if DEBUG
CollectionType argCollType = null;
bool isCollType = TypeHelpers.TryGetEdmType(arg.ResultType, out argCollType);
Debug.Assert(isCollType && argCollType != null, "DbUnaryExpression.CheckCollectionArgument allowed non-collection argument");
#endif
TypeUsage elementType = null;
if( !TypeHelpers.TryGetCollectionElementType(arg.ResultType, out elementType) ||
!TypeSemantics.IsValidPolymorphicCast(elementType, type))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_General_PolymorphicArgRequired(this.GetType().Name));
}
//
// The type of this DbExpression is a new collection type based on the requested element type.
//
this.ResultType = CommandTreeTypeHelper.CreateCollectionResultType(type);
//
// Assign the requested element type to the OfType property.
//
_ofType = type;
}
///
/// Gets the metadata of the type of elements that should be retrieved from the set argument.
///
public TypeUsage OfType
{
get { return _ofType; }
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the type conversion of a single argument to the specified type.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbTreatExpression : DbUnaryExpression
{
internal DbTreatExpression(DbCommandTree cmdTree, TypeUsage type, DbExpression arg)
: base(cmdTree, DbExpressionKind.Treat)
{
//
// Verify the type to treat as. Treat-As (NullType) is not allowed.
//
cmdTree.TypeHelper.CheckPolymorphicType(type);
//
// Verify that the Treat operation is allowed
//
if (!TypeSemantics.IsValidPolymorphicCast(arg.ResultType, type))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_General_PolymorphicArgRequired(this.GetType().Name));
}
//
// Set the Argument constraints and initialize the Argument value
//
this.ArgumentLink.InitializeValue(arg);
this.ArgumentLink.SetExpectedType(arg.ResultType);
this.ResultType = type;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents a string comparison against the specified pattern with an optional escape string
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbLikeExpression : DbExpression
{
private ExpressionLink _argument;
private ExpressionLink _pattern;
private ExpressionLink _escape;
internal DbLikeExpression(DbCommandTree cmdTree, DbExpression input, DbExpression pattern, DbExpression escape)
: base(cmdTree, DbExpressionKind.Like)
{
_argument = new ExpressionLink("Argument", cmdTree, PrimitiveTypeKind.String, input);
_pattern = new ExpressionLink("Pattern", cmdTree, PrimitiveTypeKind.String, pattern);
if (null == escape)
{
// The default escape sequence is null - not the empty string
escape = cmdTree.CreateNullExpression(pattern.ResultType);
}
_escape = new ExpressionLink("Escape", cmdTree, PrimitiveTypeKind.String, escape);
this.ResultType = cmdTree.TypeHelper.CreateBooleanResultType();
}
///
/// Gets or sets an expression that specifies the string to compare against the given pattern
///
/// The expression is null
///
/// The expression is not associated with the DbLikeExpression's command tree,
/// or its result type is not a string type.
///
public DbExpression Argument { get { return _argument.Expression; } /*CQT_PUBLIC_API(*/internal/*)*/ set { _argument.Expression = value; } }
///
/// Gets or sets an expression that specifies the pattern against which the given string should be compared
///
/// The expression is null
///
/// The expression is not associated with the DbLikeExpression's command tree,
/// or its result type is not a string type.
///
public DbExpression Pattern { get { return _pattern.Expression; } /*CQT_PUBLIC_API(*/internal/*)*/ set { _pattern.Expression = value; } }
///
/// Gets or sets an expression that provides an optional escape string to use for the comparison
///
/// The expression is null
///
/// The expression is not associated with the DbLikeExpression's command tree,
/// or its result type is not a string type.
///
public DbExpression Escape { get { return _escape.Expression; } /*CQT_PUBLIC_API(*/internal/*)*/ set { _escape.Expression = value; } }
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the retrieval of a reference to the specified Entity as a Ref.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbEntityRefExpression : DbUnaryExpression
{
internal DbEntityRefExpression(DbCommandTree cmdTree, DbExpression entity)
: base(cmdTree, DbExpressionKind.EntityRef, entity)
{
EntityType entityType = null;
if (!TypeHelpers.TryGetEdmType(this.Argument.ResultType, out entityType) || null == entityType)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_GetEntityRef_EntityRequired, "Argument");
}
this.ResultType = CommandTreeTypeHelper.CreateReferenceResultType(entityType);
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the retrieval of the key value of the specified Reference as a row.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbRefKeyExpression : DbUnaryExpression
{
internal DbRefKeyExpression(DbCommandTree cmdTree, DbExpression reference)
: base(cmdTree, DbExpressionKind.RefKey, reference)
{
RefType refType = null;
if (!TypeHelpers.TryGetEdmType(this.Argument.ResultType, out refType) || null == refType)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_GetRefKey_RefRequired, "Argument");
}
if (null == refType.ElementType)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_GetRefKey_InvalidRef, "Argument");
}
TypeUsage result = CommandTreeTypeHelper.CreateResultType(TypeHelpers.CreateKeyRowType(refType.ElementType, cmdTree.MetadataWorkspace));
this.ResultType = result;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//----------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// @owner [....], [....]
//---------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Data.Common;
using System.Data.Metadata.Edm;
using System.Data.Common.CommandTrees.Internal;
namespace System.Data.Common.CommandTrees
{
#region Boolean Operators
///
/// Represents the logical And of two Boolean arguments.
///
/// DbAndExpression requires that both of its arguments have a Boolean result type
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbAndExpression : DbBinaryExpression
{
internal DbAndExpression(DbCommandTree commandTree, DbExpression left, DbExpression right)
: base(commandTree, DbExpressionKind.And)
{
EntityUtil.CheckArgumentNull(left, "Left");
EntityUtil.CheckArgumentNull(right, "Right");
TypeUsage resultType = TypeHelpers.GetCommonTypeUsage(left.ResultType, right.ResultType);
if (null == resultType || !TypeSemantics.IsPrimitiveType(resultType, PrimitiveTypeKind.Boolean))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_And_BooleanArgumentsRequired);
}
//
// Apply constraints to the left and right arguments and set initial values
//
this.LeftLink.SetExpectedType(left.ResultType);
this.LeftLink.InitializeValue(left);
this.RightLink.SetExpectedType(right.ResultType);
this.RightLink.InitializeValue(right);
//
// Result Type is always Boolean
//
this.ResultType = resultType;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the logical Or of two Boolean arguments.
///
/// DbOrExpression requires that both of its arguments have a Boolean result type
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbOrExpression : DbBinaryExpression
{
internal DbOrExpression(DbCommandTree commandTree, DbExpression left, DbExpression right)
: base(commandTree, DbExpressionKind.Or)
{
EntityUtil.CheckArgumentNull(left, "Left");
EntityUtil.CheckArgumentNull(right, "Right");
TypeUsage resultType = TypeHelpers.GetCommonTypeUsage(left.ResultType, right.ResultType);
if (null == resultType || !TypeSemantics.IsPrimitiveType(resultType, PrimitiveTypeKind.Boolean))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Or_BooleanArgumentsRequired);
}
//
// Apply constraints to the left and right arguments and set initial values
//
this.LeftLink.SetExpectedType(left.ResultType);
this.LeftLink.InitializeValue(left);
this.RightLink.SetExpectedType(right.ResultType);
this.RightLink.InitializeValue(right);
//
// Result Type is always Boolean
//
this.ResultType = resultType;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the logical Not of a single Boolean argument.
///
/// DbNotExpression requires that its argument has a Boolean result type
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbNotExpression : DbUnaryExpression
{
internal DbNotExpression(DbCommandTree commandTree, DbExpression arg)
: base(commandTree, DbExpressionKind.Not)
{
EntityUtil.CheckArgumentNull(arg, "Argument");
//
// Argument to Not must have Boolean result type
//
if (!TypeSemantics.IsPrimitiveType(arg.ResultType, PrimitiveTypeKind.Boolean))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Not_BooleanArgumentRequired);
}
this.ArgumentLink.SetExpectedType(arg.ResultType);
this.ArgumentLink.InitializeValue(arg);
this.ResultType = arg.ResultType;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
#endregion
///
/// Represents an arithmetic operation (addition, subtraction, multiplication, division, modulo or negation) applied to two numeric arguments.
///
/// DbArithmeticExpression requires that its arguments have a common numeric result type
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbArithmeticExpression : DbExpression
{
private readonly ExpressionList _args;
internal DbArithmeticExpression(DbCommandTree commandTree, DbExpressionKind kind, IList args)
: base(commandTree, kind)
{
EntityUtil.CheckArgumentNull(args, "args");
Debug.Assert(
DbExpressionKind.Divide == kind ||
DbExpressionKind.Minus == kind ||
DbExpressionKind.Modulo == kind ||
DbExpressionKind.Multiply == kind ||
DbExpressionKind.Plus == kind ||
DbExpressionKind.UnaryMinus == kind,
"Invalid DbExpressionKind used in DbArithmeticExpression: " + Enum.GetName(typeof(DbExpressionKind), kind)
);
Debug.Assert(
(DbExpressionKind.UnaryMinus == kind && 1 == args.Count) ||
2 == args.Count,
"Incorrect number of arguments specified to DbArithmeticExpression"
);
//
// Construct a new ExpressionList to contain the arguments
//
ExpressionList argList = new ExpressionList("Arguments", commandTree, args.Count);
//
// Set the current elements without constraining the expected element type
//
argList.SetElements(args);
//
// Ensure that a numeric common type exists for the arguments
//
TypeUsage commonType = argList.GetCommonElementType();
if (TypeSemantics.IsNullOrNullType(commonType) || !TypeSemantics.IsNumericType(commonType))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Arithmetic_NumericCommonType);
}
//
// Constrain the type of elements in the list to the common numeric type
//
argList.SetExpectedElementType(commonType);
this._args = argList;
this.ResultType = commonType;
}
///
/// Gets the list of expressions that define the current arguments.
///
///
/// The Arguments property returns a fixed-size list of Arguments list
/// have a common numeric result type.
///
public IList Arguments { get { return _args; } }
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents a Case When...Then...Else logical operation.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbCaseExpression : DbExpression
{
private ExpressionList _when;
private ExpressionList _then;
private ExpressionLink _else;
internal DbCaseExpression(DbCommandTree cmdTree, IList whens, IList thens, DbExpression elseExpr)
: base(cmdTree, DbExpressionKind.Case)
{
//
// Whens/Thens cannot be null
// (nor can Else, but this is enforced when the
// ExpressionLink for the Else property is created, below).
//
EntityUtil.CheckArgumentNull(whens, "whens");
EntityUtil.CheckArgumentNull(thens, "thens");
//
// The number of 'When's must equal the number of 'Then's.
//
if (whens.Count != thens.Count)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Case_WhensMustEqualThens);
}
//
// There must be at least one clause in the case expression.
//
if (0 == whens.Count)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Case_AtLeastOneClause);
}
//
// All 'When's must produce a Boolean result, and a common (non-null) result type must exist
//
TypeUsage resultType = null;
for(int idx = 0; idx < whens.Count; idx++)
{
if (null == thens[idx])
{
throw EntityUtil.ArgumentNull(CommandTreeUtils.FormatIndex("Thens", idx));
}
if (null == resultType)
{
resultType = thens[idx].ResultType;
}
else
{
resultType = TypeHelpers.GetCommonTypeUsage(thens[idx].ResultType, resultType);
if (null == resultType)
{
break;
}
}
}
if (resultType != null && elseExpr != null)
{
resultType = TypeHelpers.GetCommonTypeUsage(elseExpr.ResultType, resultType);
}
if (TypeSemantics.IsNullOrNullType(resultType))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Case_InvalidResultType);
}
//
// Initialize the When clauses. Elements must be promotable to Boolean.
// NullType is specifically not allowed as the Type of a When element.
//
_when = new ExpressionList("When", cmdTree, PrimitiveTypeKind.Boolean, whens);
//
// Initialize the Then clauses. Elements must be promotable to the common result type.
//
_then = new ExpressionList("Then", cmdTree, resultType, thens);
//
// Initialize the Else clause. Values must be promotable to the common result type.
//
_else = new ExpressionLink("Else", cmdTree, resultType, elseExpr);
//
// The result type of DbCaseExpression is the common result type
//
this.ResultType = resultType;
}
///
/// Gets the When clauses of this DbCaseExpression.
///
public IList When { get { return _when; } }
///
/// Gets the Then clauses of this DbCaseExpression.
///
public IList Then { get { return _then; } }
///
/// Gets or sets the Else clause of this DbCaseExpression.
///
/// The expression is null
///
/// The expression is not associated with the DbCaseExpression's command tree,
/// or its result type is not equal or promotable to the result type of the DbCaseExpression
///
public DbExpression Else { get { return _else.Expression; } /*CQT_PUBLIC_API(*/internal/*)*/ set { _else.Expression = value; } }
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents a cast operation applied to a polymorphic argument.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbCastExpression : DbUnaryExpression
{
internal DbCastExpression(DbCommandTree cmdTree, TypeUsage type, DbExpression arg)
: base(cmdTree, DbExpressionKind.Cast)
{
//
// Verify the type to cast to. Casting to NullType is not allowed
//
cmdTree.TypeHelper.CheckType(type);
//
// Verify that the cast is allowed
//
if (!TypeSemantics.IsCastAllowed(arg.ResultType, type))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Cast_InvalidCast(TypeHelpers.GetFullName(arg.ResultType), TypeHelpers.GetFullName(type)));
}
//
// Set the Argument constraints and initialize the argument value
//
this.ArgumentLink.InitializeValue(arg);
this.ArgumentLink.SetExpectedType(arg.ResultType);
this.ResultType = type;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents a comparison operation (equality, greater than, greather than or equal, less than, less than or equal, inequality) applied to two arguments.
///
///
/// DbComparisonExpression requires that its arguments have a common result type
/// that is equality comparable (for
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbComparisonExpression : DbBinaryExpression
{
internal DbComparisonExpression(DbCommandTree commandTree, DbExpressionKind kind, DbExpression left, DbExpression right)
: base(commandTree, kind)
{
Debug.Assert(
DbExpressionKind.Equals == kind ||
DbExpressionKind.LessThan == kind ||
DbExpressionKind.LessThanOrEquals == kind ||
DbExpressionKind.GreaterThan == kind ||
DbExpressionKind.GreaterThanOrEquals == kind ||
DbExpressionKind.NotEquals == kind,
"Invalid DbExpressionKind used in DbComparisonExpression: " + Enum.GetName(typeof(DbExpressionKind), kind)
);
//
// Initialize the Left and Right arguments to perform Null value and NullType checking
//
this.LeftLink.InitializeValue(left);
this.RightLink.InitializeValue(right);
//
// Ensure that the types of the arguments are comparable
//
this.CheckComparison(left, right);
//
// Register for notifications that the left or right argument is changing.
// The arguments can be freely substituted provided that when a value is changed,
// the result type of the new expression value and the result type of the unchanged argument are comparable.
//
this.LeftLink.ValueChanging += new ExpressionLinkConstraint(this.ArgumentChanging);
this.RightLink.ValueChanging += new ExpressionLinkConstraint(this.ArgumentChanging);
//
// Result Type is always Boolean
//
this.ResultType = commandTree.TypeHelper.CreateBooleanResultType();
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
private void ArgumentChanging(ExpressionLink link, DbExpression newValue)
{
//
// If the Left expression is changing then the Right expression should be compared
// to the new value, and vice-versa.
//
if (this.LeftLink == link)
{
this.CheckComparison(newValue, this.Right);
}
else
{
this.CheckComparison(this.Left, newValue);
}
}
private void CheckComparison(DbExpression left, DbExpression right)
{
//
// A comparison of the specified kind must exist between the left and right arguments
//
bool equality = true;
bool order = true;
if (DbExpressionKind.GreaterThanOrEquals == this.ExpressionKind ||
DbExpressionKind.LessThanOrEquals == this.ExpressionKind)
{
equality = TypeSemantics.IsEqualComparableTo(left.ResultType, right.ResultType);
order = TypeSemantics.IsOrderComparableTo(left.ResultType, right.ResultType);
}
else if (DbExpressionKind.Equals == this.ExpressionKind ||
DbExpressionKind.NotEquals == this.ExpressionKind)
{
equality = TypeSemantics.IsEqualComparableTo(left.ResultType, right.ResultType);
}
else
{
order = TypeSemantics.IsOrderComparableTo(left.ResultType, right.ResultType);
}
if(!equality || !order)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Comparison_ComparableRequired);
}
}
}
///
/// Represents empty set determination applied to a single set argument.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbIsEmptyExpression : DbUnaryExpression
{
internal DbIsEmptyExpression(DbCommandTree cmdTree, DbExpression arg)
: base(cmdTree, DbExpressionKind.IsEmpty, arg)
{
//
// Ensure that the Argument is of a collection type
//
this.CheckCollectionArgument();
//
// Result Type is always Boolean
//
this.ResultType = cmdTree.TypeHelper.CreateBooleanResultType();
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents null determination applied to a single argument.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbIsNullExpression : DbUnaryExpression
{
internal DbIsNullExpression(DbCommandTree cmdTree, DbExpression arg, bool isRowTypeArgumentAllowed)
: base(cmdTree, DbExpressionKind.IsNull)
{
//
// The argument cannot be of a collection type
//
if (TypeSemantics.IsCollectionType(arg.ResultType))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_IsNull_CollectionNotAllowed);
}
//
// ensure argument type is valid for this operation
//
if (!TypeHelpers.IsValidIsNullOpType(arg.ResultType) && (!isRowTypeArgumentAllowed || !TypeSemantics.IsRowType(arg.ResultType)))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_IsNull_InvalidType);
}
//
// Set the Argument constraints and initialize the Argument value
// ArgumentLink.SetExpectedType is not called - any expression can be substituted freely for the argument expression
//
this.ArgumentLink.InitializeValue(arg);
//
// Result Type is always Boolean
//
this.ResultType = cmdTree.TypeHelper.CreateBooleanResultType();
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the type comparison of a single argument against the specified type.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbIsOfExpression : DbUnaryExpression
{
private TypeUsage _ofType;
internal DbIsOfExpression(DbCommandTree cmdTree, DbExpressionKind isOfKind, TypeUsage type, DbExpression arg)
: base(cmdTree, isOfKind)
{
Debug.Assert(DbExpressionKind.IsOf == this.ExpressionKind || DbExpressionKind.IsOfOnly == this.ExpressionKind, string.Format(CultureInfo.InvariantCulture, "Invalid DbExpressionKind used in DbIsOfExpression: {0}", Enum.GetName(typeof(DbExpressionKind), this.ExpressionKind)));
//
// Ensure the ofType is non-null, associated with the correct metadata workspace/dataspace,
// is not NullType, and is polymorphic
//
cmdTree.TypeHelper.CheckPolymorphicType(type);
//
// Verify that the IsOf operation is allowed
//
if (!TypeSemantics.IsValidPolymorphicCast(arg.ResultType, type))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_General_PolymorphicArgRequired(this.GetType().Name));
}
_ofType = type;
//
// Set the Argument constraints and initialize the Argument value
//
this.ArgumentLink.SetExpectedType(arg.ResultType);
this.ArgumentLink.InitializeValue(arg);
//
// Return type is always Boolean
//
this.ResultType = cmdTree.TypeHelper.CreateBooleanResultType();
}
///
/// Gets the type metadata that the type metadata of the argument should be compared to.
///
public TypeUsage OfType
{
get { return _ofType; }
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the retrieval of elements of the specified type from the given set argument.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbOfTypeExpression : DbUnaryExpression
{
private TypeUsage _ofType;
internal DbOfTypeExpression(DbCommandTree cmdTree, DbExpressionKind ofTypeKind, TypeUsage type, DbExpression arg)
: base(cmdTree, ofTypeKind, arg)
{
Debug.Assert(DbExpressionKind.OfType == ofTypeKind ||
DbExpressionKind.OfTypeOnly == ofTypeKind,
"ExpressionKind for DbOfTypeExpression must be OfType or OfTypeOnly");
//
// Ensure that the type is non-null and valid - from the same metadata collection and dataspace and the command tree.
// The type is also not allowed to be NullType.
//
cmdTree.TypeHelper.CheckPolymorphicType(type);
//
// Ensure that the argument is actually of a collection type.
//
this.CheckCollectionArgument();
//
// Verify that the OfType operation is allowed
//
#if DEBUG
CollectionType argCollType = null;
bool isCollType = TypeHelpers.TryGetEdmType(arg.ResultType, out argCollType);
Debug.Assert(isCollType && argCollType != null, "DbUnaryExpression.CheckCollectionArgument allowed non-collection argument");
#endif
TypeUsage elementType = null;
if( !TypeHelpers.TryGetCollectionElementType(arg.ResultType, out elementType) ||
!TypeSemantics.IsValidPolymorphicCast(elementType, type))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_General_PolymorphicArgRequired(this.GetType().Name));
}
//
// The type of this DbExpression is a new collection type based on the requested element type.
//
this.ResultType = CommandTreeTypeHelper.CreateCollectionResultType(type);
//
// Assign the requested element type to the OfType property.
//
_ofType = type;
}
///
/// Gets the metadata of the type of elements that should be retrieved from the set argument.
///
public TypeUsage OfType
{
get { return _ofType; }
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the type conversion of a single argument to the specified type.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbTreatExpression : DbUnaryExpression
{
internal DbTreatExpression(DbCommandTree cmdTree, TypeUsage type, DbExpression arg)
: base(cmdTree, DbExpressionKind.Treat)
{
//
// Verify the type to treat as. Treat-As (NullType) is not allowed.
//
cmdTree.TypeHelper.CheckPolymorphicType(type);
//
// Verify that the Treat operation is allowed
//
if (!TypeSemantics.IsValidPolymorphicCast(arg.ResultType, type))
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_General_PolymorphicArgRequired(this.GetType().Name));
}
//
// Set the Argument constraints and initialize the Argument value
//
this.ArgumentLink.InitializeValue(arg);
this.ArgumentLink.SetExpectedType(arg.ResultType);
this.ResultType = type;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents a string comparison against the specified pattern with an optional escape string
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbLikeExpression : DbExpression
{
private ExpressionLink _argument;
private ExpressionLink _pattern;
private ExpressionLink _escape;
internal DbLikeExpression(DbCommandTree cmdTree, DbExpression input, DbExpression pattern, DbExpression escape)
: base(cmdTree, DbExpressionKind.Like)
{
_argument = new ExpressionLink("Argument", cmdTree, PrimitiveTypeKind.String, input);
_pattern = new ExpressionLink("Pattern", cmdTree, PrimitiveTypeKind.String, pattern);
if (null == escape)
{
// The default escape sequence is null - not the empty string
escape = cmdTree.CreateNullExpression(pattern.ResultType);
}
_escape = new ExpressionLink("Escape", cmdTree, PrimitiveTypeKind.String, escape);
this.ResultType = cmdTree.TypeHelper.CreateBooleanResultType();
}
///
/// Gets or sets an expression that specifies the string to compare against the given pattern
///
/// The expression is null
///
/// The expression is not associated with the DbLikeExpression's command tree,
/// or its result type is not a string type.
///
public DbExpression Argument { get { return _argument.Expression; } /*CQT_PUBLIC_API(*/internal/*)*/ set { _argument.Expression = value; } }
///
/// Gets or sets an expression that specifies the pattern against which the given string should be compared
///
/// The expression is null
///
/// The expression is not associated with the DbLikeExpression's command tree,
/// or its result type is not a string type.
///
public DbExpression Pattern { get { return _pattern.Expression; } /*CQT_PUBLIC_API(*/internal/*)*/ set { _pattern.Expression = value; } }
///
/// Gets or sets an expression that provides an optional escape string to use for the comparison
///
/// The expression is null
///
/// The expression is not associated with the DbLikeExpression's command tree,
/// or its result type is not a string type.
///
public DbExpression Escape { get { return _escape.Expression; } /*CQT_PUBLIC_API(*/internal/*)*/ set { _escape.Expression = value; } }
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the retrieval of a reference to the specified Entity as a Ref.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbEntityRefExpression : DbUnaryExpression
{
internal DbEntityRefExpression(DbCommandTree cmdTree, DbExpression entity)
: base(cmdTree, DbExpressionKind.EntityRef, entity)
{
EntityType entityType = null;
if (!TypeHelpers.TryGetEdmType(this.Argument.ResultType, out entityType) || null == entityType)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_GetEntityRef_EntityRequired, "Argument");
}
this.ResultType = CommandTreeTypeHelper.CreateReferenceResultType(entityType);
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
///
/// Represents the retrieval of the key value of the specified Reference as a row.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
public sealed class DbRefKeyExpression : DbUnaryExpression
{
internal DbRefKeyExpression(DbCommandTree cmdTree, DbExpression reference)
: base(cmdTree, DbExpressionKind.RefKey, reference)
{
RefType refType = null;
if (!TypeHelpers.TryGetEdmType(this.Argument.ResultType, out refType) || null == refType)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_GetRefKey_RefRequired, "Argument");
}
if (null == refType.ElementType)
{
throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_GetRefKey_InvalidRef, "Argument");
}
TypeUsage result = CommandTreeTypeHelper.CreateResultType(TypeHelpers.CreateKeyRowType(refType.ElementType, cmdTree.MetadataWorkspace));
this.ResultType = result;
}
///
/// The visitor pattern method for expression visitors that do not produce a result value.
///
/// An instance of DbExpressionVisitor.
///
/// The visitor pattern method for expression visitors that produce a result value of a specific type.
///
/// An instance of a typed DbExpressionVisitor that produces a result value of type TResultType.
/// The type of the result produced by
/// An instance of
public override TResultType Accept(DbExpressionVisitor visitor) { if (visitor != null) { return visitor.Visit(this); } else { throw EntityUtil.ArgumentNull("visitor"); } }
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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