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/ 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 / Internal / ExpressionLink.cs / 1 / ExpressionLink.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....], [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Data.Common; using System.Diagnostics; using System.Globalization; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; namespace System.Data.Common.CommandTrees.Internal { internal delegate void ExpressionLinkConstraint(ExpressionLink link, DbExpression newValue); internal class ExpressionLink { private string _name; private DbCommandTree _tree; private DbExpression _expression; private TypeUsage _expectedType; ////// Creates a new ExpressionLink. The Expected Type and inital value are not set. /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink internal ExpressionLink(string name, DbCommandTree commandTree) { _name = name; _tree = EntityUtil.CheckArgumentNull(commandTree, "commandTree"); } ////// Creates a new ExpressionLink with the specified initial value. The Expected Type of the ExpressionLink is fixed as the Type of the initial value /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink /// An expression that provides the initial value of the ExpressionLink internal ExpressionLink(string strName, DbCommandTree commandTree, DbExpression initialValue) : this(strName, commandTree) { // // Attempt to set the DbExpression property to the specified initial value // this.InitializeValue(initialValue); // // If initialization was successful then fix the type of the initial value as the type to which subsequent expressions values must be promotable // this.SetExpectedType(initialValue.ResultType); } ////// Creates a new ExpressionLink with the specified expected type. /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink /// A description of the type to which the types of values assigned to this ExpressionLink must be promotable internal ExpressionLink(string name, DbCommandTree commandTree, TypeUsage expectedType) : this(name, commandTree) { // // Fix the specified type as the type to which future values must be promotable // this.SetExpectedType(expectedType); } ////// Creates a new ExpressionLink with the specified expected type and initial value. If the specified value is not promotable to the expected type an exception is thrown. /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink /// A description of the type to which the types of values assigned to this ExpressionLink must be promotable /// A DbExpression that provides the initial value of the ExpressionLink ///If the Type of the inital value is not promotable to the expected type internal ExpressionLink(string name, DbCommandTree commandTree, TypeUsage expectedType, DbExpression initialValue) : this(name, commandTree) { // // Fix the specified type as the type to which future values must be promotable // this.SetExpectedType(expectedType); // // Attempt to set the DbExpression property to the specified initial value // this.InitializeValue(initialValue); } ////// Creates a new ExpressionLink with the specified expected primitive type and initial value. If the specified value is not promotable to the expected ModelType an exception is thrown. /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink /// The primitive type to which the types of values assigned to this ExpressionLink must be promotable /// A DbExpression that provides the initial value of the ExpressionLink ///If the Type of the inital value is not promotable to the expected primitive type internal ExpressionLink(string name, DbCommandTree commandTree, PrimitiveTypeKind expectedPrimitiveType, DbExpression initialValue) : this(name, commandTree) { // initialValue cannot be null EntityUtil.CheckArgumentNull(initialValue, this.Name); // // Ensure initialValue is the expected primitive type // PrimitiveTypeKind valueTypeKind; bool valueIsPrimitive = TypeHelpers.TryGetPrimitiveTypeKind(initialValue.ResultType, out valueTypeKind); if( !valueIsPrimitive || valueTypeKind != expectedPrimitiveType) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_ExpressionLink_TypeMismatch(Enum.GetName(typeof(PrimitiveTypeKind), expectedPrimitiveType), valueIsPrimitive ? Enum.GetName(typeof(PrimitiveTypeKind), valueTypeKind) : TypeHelpers.GetFullName(initialValue.ResultType)), this.Name); } // // Fix the specified type as the type to which future values must be promotable // this.SetExpectedType(initialValue.ResultType); // // Attempt to set the DbExpression property to the specified initial value // this.InitializeValue(initialValue); } internal string Name { get { return _name; } } public DbExpression Expression { get { return _expression; } set { // // Verify that the expression satisifes the constraints of this ExpressionLink // if (this.CheckValue(value)) { // Update the DbExpression property and inform the owner tree that it should be considered 'modified' this.UpdateValue(value); _tree.SetModified(); } } } ////// Sets the DbExpression value of this ExpressionLink without instructing the owning command tree to consider itself 'modified'. /// Should only be used when setting the initial value of the ExpressionLink. /// /// internal void InitializeValue(DbExpression initialValue) { this.CheckValue(initialValue); this.UpdateValue(initialValue); } ////// Sets the type to which the types of values assigned to this ExpressionLink must be promotable. /// Can only be set once. Subsequent attempts to set the expected type will result in an exception. /// /// A TypeUsage instance that describes the expected type ///If the expected type has already been set internal void SetExpectedType(TypeUsage expectedType) { Debug.Assert(null == _expectedType, "ExpressionLink.SetExpectedType should only be called once"); Debug.Assert(expectedType.IsReadOnly, "Editable type used as ExpressionLink expected type"); _expectedType = expectedType; } internal event ExpressionLinkConstraint ValueChanging; #if EXPRESSIONLINK_FIRE_CHANGED internal event ExpressionLinkConstraint ValueChanged; #endif private bool CheckValue(DbExpression newValue) { // // Is the DbExpression null? // EntityUtil.CheckArgumentNull(newValue, this.Name); if (object.ReferenceEquals(newValue, _expression)) { return false; } // Does the DbExpression belong to the expected command tree? if (!object.ReferenceEquals(_tree, newValue.CommandTree)) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_General_TreeMismatch, this.Name); } // Is the Type of the new value promotable to the Type of the old value? if (_expectedType != null) { if (!TypeSemantics.IsEquivalentOrPromotableTo(newValue.ResultType, _expectedType)) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_ExpressionLink_TypeMismatch( TypeHelpers.GetFullName(_expectedType), TypeHelpers.GetFullName(newValue.ResultType) ), this.Name ); } } // If the Type of the new value is NullType, throw if NullType is not allowed if (TypeSemantics.IsNullType(newValue.ResultType)) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_ExpressionLink_NullTypeInvalid(this.Name), this.Name); } // // All invariant constraints have been satisfied, so raise the Changing event to allow dynamic constraints to be tested // if (this.ValueChanging != null) { this.ValueChanging(this, newValue); } return true; } private void UpdateValue(DbExpression newValue) { _expression = newValue; #if EXPRESSIONLINK_FIRECHANGED if (this.ValueChanged != null) { this.ValueChanged(this, newValue); } #endif } } // End of class ExpressionLink } // End of namespace System.Data.Common.CommandTrees.Internal // 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.Data.Common; using System.Diagnostics; using System.Globalization; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; namespace System.Data.Common.CommandTrees.Internal { internal delegate void ExpressionLinkConstraint(ExpressionLink link, DbExpression newValue); internal class ExpressionLink { private string _name; private DbCommandTree _tree; private DbExpression _expression; private TypeUsage _expectedType; ////// Creates a new ExpressionLink. The Expected Type and inital value are not set. /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink internal ExpressionLink(string name, DbCommandTree commandTree) { _name = name; _tree = EntityUtil.CheckArgumentNull(commandTree, "commandTree"); } ////// Creates a new ExpressionLink with the specified initial value. The Expected Type of the ExpressionLink is fixed as the Type of the initial value /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink /// An expression that provides the initial value of the ExpressionLink internal ExpressionLink(string strName, DbCommandTree commandTree, DbExpression initialValue) : this(strName, commandTree) { // // Attempt to set the DbExpression property to the specified initial value // this.InitializeValue(initialValue); // // If initialization was successful then fix the type of the initial value as the type to which subsequent expressions values must be promotable // this.SetExpectedType(initialValue.ResultType); } ////// Creates a new ExpressionLink with the specified expected type. /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink /// A description of the type to which the types of values assigned to this ExpressionLink must be promotable internal ExpressionLink(string name, DbCommandTree commandTree, TypeUsage expectedType) : this(name, commandTree) { // // Fix the specified type as the type to which future values must be promotable // this.SetExpectedType(expectedType); } ////// Creates a new ExpressionLink with the specified expected type and initial value. If the specified value is not promotable to the expected type an exception is thrown. /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink /// A description of the type to which the types of values assigned to this ExpressionLink must be promotable /// A DbExpression that provides the initial value of the ExpressionLink ///If the Type of the inital value is not promotable to the expected type internal ExpressionLink(string name, DbCommandTree commandTree, TypeUsage expectedType, DbExpression initialValue) : this(name, commandTree) { // // Fix the specified type as the type to which future values must be promotable // this.SetExpectedType(expectedType); // // Attempt to set the DbExpression property to the specified initial value // this.InitializeValue(initialValue); } ////// Creates a new ExpressionLink with the specified expected primitive type and initial value. If the specified value is not promotable to the expected ModelType an exception is thrown. /// /// The name of the DbExpression property that this ExpressionLink implements /// The command tree that owns this ExpressionLink /// The primitive type to which the types of values assigned to this ExpressionLink must be promotable /// A DbExpression that provides the initial value of the ExpressionLink ///If the Type of the inital value is not promotable to the expected primitive type internal ExpressionLink(string name, DbCommandTree commandTree, PrimitiveTypeKind expectedPrimitiveType, DbExpression initialValue) : this(name, commandTree) { // initialValue cannot be null EntityUtil.CheckArgumentNull(initialValue, this.Name); // // Ensure initialValue is the expected primitive type // PrimitiveTypeKind valueTypeKind; bool valueIsPrimitive = TypeHelpers.TryGetPrimitiveTypeKind(initialValue.ResultType, out valueTypeKind); if( !valueIsPrimitive || valueTypeKind != expectedPrimitiveType) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_ExpressionLink_TypeMismatch(Enum.GetName(typeof(PrimitiveTypeKind), expectedPrimitiveType), valueIsPrimitive ? Enum.GetName(typeof(PrimitiveTypeKind), valueTypeKind) : TypeHelpers.GetFullName(initialValue.ResultType)), this.Name); } // // Fix the specified type as the type to which future values must be promotable // this.SetExpectedType(initialValue.ResultType); // // Attempt to set the DbExpression property to the specified initial value // this.InitializeValue(initialValue); } internal string Name { get { return _name; } } public DbExpression Expression { get { return _expression; } set { // // Verify that the expression satisifes the constraints of this ExpressionLink // if (this.CheckValue(value)) { // Update the DbExpression property and inform the owner tree that it should be considered 'modified' this.UpdateValue(value); _tree.SetModified(); } } } ////// Sets the DbExpression value of this ExpressionLink without instructing the owning command tree to consider itself 'modified'. /// Should only be used when setting the initial value of the ExpressionLink. /// /// internal void InitializeValue(DbExpression initialValue) { this.CheckValue(initialValue); this.UpdateValue(initialValue); } ////// Sets the type to which the types of values assigned to this ExpressionLink must be promotable. /// Can only be set once. Subsequent attempts to set the expected type will result in an exception. /// /// A TypeUsage instance that describes the expected type ///If the expected type has already been set internal void SetExpectedType(TypeUsage expectedType) { Debug.Assert(null == _expectedType, "ExpressionLink.SetExpectedType should only be called once"); Debug.Assert(expectedType.IsReadOnly, "Editable type used as ExpressionLink expected type"); _expectedType = expectedType; } internal event ExpressionLinkConstraint ValueChanging; #if EXPRESSIONLINK_FIRE_CHANGED internal event ExpressionLinkConstraint ValueChanged; #endif private bool CheckValue(DbExpression newValue) { // // Is the DbExpression null? // EntityUtil.CheckArgumentNull(newValue, this.Name); if (object.ReferenceEquals(newValue, _expression)) { return false; } // Does the DbExpression belong to the expected command tree? if (!object.ReferenceEquals(_tree, newValue.CommandTree)) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_General_TreeMismatch, this.Name); } // Is the Type of the new value promotable to the Type of the old value? if (_expectedType != null) { if (!TypeSemantics.IsEquivalentOrPromotableTo(newValue.ResultType, _expectedType)) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_ExpressionLink_TypeMismatch( TypeHelpers.GetFullName(_expectedType), TypeHelpers.GetFullName(newValue.ResultType) ), this.Name ); } } // If the Type of the new value is NullType, throw if NullType is not allowed if (TypeSemantics.IsNullType(newValue.ResultType)) { throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_ExpressionLink_NullTypeInvalid(this.Name), this.Name); } // // All invariant constraints have been satisfied, so raise the Changing event to allow dynamic constraints to be tested // if (this.ValueChanging != null) { this.ValueChanging(this, newValue); } return true; } private void UpdateValue(DbExpression newValue) { _expression = newValue; #if EXPRESSIONLINK_FIRECHANGED if (this.ValueChanged != null) { this.ValueChanged(this, newValue); } #endif } } // End of class ExpressionLink } // End of namespace System.Data.Common.CommandTrees.Internal // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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