ReferentialConstraint.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / ReferentialConstraint.cs / 1 / ReferentialConstraint.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System.Collections.Generic;
using System.Collections.ObjectModel; 
using System.Data.Common;

namespace System.Data.Metadata.Edm
{ 
    /// 
    /// This class describes referential constraint on the relationships 
    ///  
    public sealed class ReferentialConstraint : MetadataItem
    { 
        #region Constructors
        /// 
        /// Constructs a new constraint on the relationship
        ///  
        /// role from which the relationship originates
        /// role to which the relationship is linked/targeted to 
        /// properties on entity type of from role which take part in the constraint 
        /// properties on entity type of to role which take part in the constraint
        /// Argument Null exception if any of the arguments is null 
        internal ReferentialConstraint(RelationshipEndMember fromRole,
                                     RelationshipEndMember toRole,
                                     IEnumerable fromProperties,
                                     IEnumerable toProperties) 
        {
            _fromRole = EntityUtil.GenericCheckArgumentNull(fromRole, "fromRole"); 
            _toRole = EntityUtil.GenericCheckArgumentNull(toRole, "toRole"); 
            _fromProperties = new ReadOnlyMetadataCollection(new MetadataCollection(
                EntityUtil.GenericCheckArgumentNull(fromProperties, "fromProperties"))); 
            _toProperties = new ReadOnlyMetadataCollection(new MetadataCollection(
                EntityUtil.GenericCheckArgumentNull(toProperties, "toProperties")));
        }
        #endregion 

        #region Fields 
        private RelationshipEndMember _fromRole; 
        private RelationshipEndMember _toRole;
        private readonly ReadOnlyMetadataCollection _fromProperties; 
        private readonly ReadOnlyMetadataCollection _toProperties;
        #endregion

        #region Properties 
        /// 
        /// Returns the kind of the type 
        ///  
        public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.ReferentialConstraint; } }
 
        /// 
        /// Returns the identity for this constraint
        /// 
        internal override string Identity 
        {
            get 
            { 
                return this.FromRole.Name + "_" + this.ToRole.Name;
            } 
        }

        /// 
        /// Returns the FromRole which takes part in this referential constraint 
        /// 
        /// Thrown if value passed into setter is null 
        /// Thrown if the ReferentialConstraint instance is in ReadOnly state 
        [MetadataProperty(BuiltInTypeKind.RelationshipEndMember, false)]
        public RelationshipEndMember FromRole 
        {
            get
            {
                return _fromRole; 
            }
        } 
 
        /// 
        /// Returns the ToRole which takes part in this referential constraint 
        /// 
        /// Thrown if value passed into setter is null
        /// Thrown if the ReferentialConstraint instance is in ReadOnly state
        [MetadataProperty(BuiltInTypeKind.RelationshipEndMember, false)] 
        public RelationshipEndMember ToRole
        { 
            get 
            {
                return _toRole; 
            }
        }

        ///  
        /// Returns the collection of properties on the from role on which the constraint is defined on
        ///  
        [MetadataProperty(BuiltInTypeKind.EdmProperty, true)] 
        public ReadOnlyMetadataCollection FromProperties
        { 
            get
            {
                return _fromProperties;
            } 
        }
 
        ///  
        /// Returns the collection of properties on the ToRole on whose value the constraint is defined on
        ///  
        [MetadataProperty(BuiltInTypeKind.EdmProperty, true)]
        public ReadOnlyMetadataCollection ToProperties
        {
            get 
            {
                return _toProperties; 
            } 
        }
        #endregion 

        #region Methods
        /// 
        /// Overriding System.Object.ToString to provide better String representation 
        /// ofr this type.
        ///  
        public override string ToString() 
        {
            return this.FromRole.Name + "_" + this.ToRole.Name; 
        }

        /// 
        /// Sets this item to be readonly, once this is set, the item will never be writable again. 
        /// 
        internal override void SetReadOnly() 
        { 
            if (!IsReadOnly)
            { 
                base.SetReadOnly();

                RelationshipEndMember fromRole = FromRole;
                if (fromRole != null) 
                {
                    fromRole.SetReadOnly(); 
                } 

                RelationshipEndMember toRole = ToRole; 
                if (toRole != null)
                {
                    toRole.SetReadOnly();
                } 
                this.FromProperties.Source.SetReadOnly();
                this.ToProperties.Source.SetReadOnly(); 
            } 
        }
        #endregion 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System.Collections.Generic;
using System.Collections.ObjectModel; 
using System.Data.Common;

namespace System.Data.Metadata.Edm
{ 
    /// 
    /// This class describes referential constraint on the relationships 
    ///  
    public sealed class ReferentialConstraint : MetadataItem
    { 
        #region Constructors
        /// 
        /// Constructs a new constraint on the relationship
        ///  
        /// role from which the relationship originates
        /// role to which the relationship is linked/targeted to 
        /// properties on entity type of from role which take part in the constraint 
        /// properties on entity type of to role which take part in the constraint
        /// Argument Null exception if any of the arguments is null 
        internal ReferentialConstraint(RelationshipEndMember fromRole,
                                     RelationshipEndMember toRole,
                                     IEnumerable fromProperties,
                                     IEnumerable toProperties) 
        {
            _fromRole = EntityUtil.GenericCheckArgumentNull(fromRole, "fromRole"); 
            _toRole = EntityUtil.GenericCheckArgumentNull(toRole, "toRole"); 
            _fromProperties = new ReadOnlyMetadataCollection(new MetadataCollection(
                EntityUtil.GenericCheckArgumentNull(fromProperties, "fromProperties"))); 
            _toProperties = new ReadOnlyMetadataCollection(new MetadataCollection(
                EntityUtil.GenericCheckArgumentNull(toProperties, "toProperties")));
        }
        #endregion 

        #region Fields 
        private RelationshipEndMember _fromRole; 
        private RelationshipEndMember _toRole;
        private readonly ReadOnlyMetadataCollection _fromProperties; 
        private readonly ReadOnlyMetadataCollection _toProperties;
        #endregion

        #region Properties 
        /// 
        /// Returns the kind of the type 
        ///  
        public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.ReferentialConstraint; } }
 
        /// 
        /// Returns the identity for this constraint
        /// 
        internal override string Identity 
        {
            get 
            { 
                return this.FromRole.Name + "_" + this.ToRole.Name;
            } 
        }

        /// 
        /// Returns the FromRole which takes part in this referential constraint 
        /// 
        /// Thrown if value passed into setter is null 
        /// Thrown if the ReferentialConstraint instance is in ReadOnly state 
        [MetadataProperty(BuiltInTypeKind.RelationshipEndMember, false)]
        public RelationshipEndMember FromRole 
        {
            get
            {
                return _fromRole; 
            }
        } 
 
        /// 
        /// Returns the ToRole which takes part in this referential constraint 
        /// 
        /// Thrown if value passed into setter is null
        /// Thrown if the ReferentialConstraint instance is in ReadOnly state
        [MetadataProperty(BuiltInTypeKind.RelationshipEndMember, false)] 
        public RelationshipEndMember ToRole
        { 
            get 
            {
                return _toRole; 
            }
        }

        ///  
        /// Returns the collection of properties on the from role on which the constraint is defined on
        ///  
        [MetadataProperty(BuiltInTypeKind.EdmProperty, true)] 
        public ReadOnlyMetadataCollection FromProperties
        { 
            get
            {
                return _fromProperties;
            } 
        }
 
        ///  
        /// Returns the collection of properties on the ToRole on whose value the constraint is defined on
        ///  
        [MetadataProperty(BuiltInTypeKind.EdmProperty, true)]
        public ReadOnlyMetadataCollection ToProperties
        {
            get 
            {
                return _toProperties; 
            } 
        }
        #endregion 

        #region Methods
        /// 
        /// Overriding System.Object.ToString to provide better String representation 
        /// ofr this type.
        ///  
        public override string ToString() 
        {
            return this.FromRole.Name + "_" + this.ToRole.Name; 
        }

        /// 
        /// Sets this item to be readonly, once this is set, the item will never be writable again. 
        /// 
        internal override void SetReadOnly() 
        { 
            if (!IsReadOnly)
            { 
                base.SetReadOnly();

                RelationshipEndMember fromRole = FromRole;
                if (fromRole != null) 
                {
                    fromRole.SetReadOnly(); 
                } 

                RelationshipEndMember toRole = ToRole; 
                if (toRole != null)
                {
                    toRole.SetReadOnly();
                } 
                this.FromProperties.Source.SetReadOnly();
                this.ToProperties.Source.SetReadOnly(); 
            } 
        }
        #endregion 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ReferentialConstraint.cs source code in C# .NET

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