Propagator.JoinPropagator.SubstitutingCloneVisitor.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / Update / Internal / Propagator.JoinPropagator.SubstitutingCloneVisitor.cs / 1305376 / Propagator.JoinPropagator.SubstitutingCloneVisitor.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Collections.Generic; 
using System.Data.Common;

namespace System.Data.Mapping.Update.Internal
{ 
    internal partial class Propagator
    { 
        private partial class JoinPropagator 
        {
            ///  
            /// Describes the mode of behavior for the .
            /// 
            private enum PopulateMode
            { 
                /// 
                /// Produce a null extension record (for outer joins) marked as modified 
                ///  
                NullModified,
                ///  
                /// Produce a null extension record (for outer joins) marked as preserve
                /// 
                NullPreserve,
                ///  
                /// Produce a placeholder for a record that is known to exist but whose specific
                /// values are unknown. 
                ///  
                Unknown,
            } 

            /// 
            /// Fills in a placeholder with join key data (also performs a clone so that the
            /// placeholder can be reused). 
            /// 
            ///  
            /// Clones of placeholder nodes are created when either the structure of the node 
            /// needs to change or the record markup for the node needs to change.
            ///  
            private static class PlaceholderPopulator
            {
                #region Methods
                ///  
                /// Construct a new placeholder with the shape of the given placeholder. Key values are
                /// injected into the resulting place holder and default values are substituted with 
                /// either propagator constants or progagator nulls depending on the mode established 
                /// by the  flag.
                ///  
                /// 
                /// The key is essentially an array of values. The key map indicates that for a particular
                /// placeholder an expression (keyMap.Keys) corresponds to some ordinal in the key array.
                ///  
                /// Placeholder to clone
                /// Key to substitute 
                /// Key elements in the placeholder (ordinally aligned with 'key') 
                /// Mode of operation.
                /// Translator context. 
                /// Cloned placeholder with key values
                internal static PropagatorResult Populate(PropagatorResult placeholder, CompositeKey key,
                    CompositeKey placeholderKey, PopulateMode mode, UpdateTranslator translator)
                { 
                    EntityUtil.CheckArgumentNull(placeholder, "placeholder");
                    EntityUtil.CheckArgumentNull(key, "key"); 
                    EntityUtil.CheckArgumentNull(placeholderKey, "placeholderKey"); 
                    EntityUtil.CheckArgumentNull(translator, "translator");
 
                    // Figure out which flags to apply to generated elements.
                    bool isNull = mode == PopulateMode.NullModified || mode == PopulateMode.NullPreserve;
                    bool preserve = mode == PopulateMode.NullPreserve || mode == PopulateMode.Unknown;
                    PropagatorFlags flags = PropagatorFlags.NoFlags; 
                    if (!isNull) { flags |= PropagatorFlags.Unknown; } // only null values are known
                    if (preserve) { flags |= PropagatorFlags.Preserve; } 
 
                    PropagatorResult result = placeholder.Replace(node =>
                        { 
                            // See if this is a key element
                            int keyIndex = -1;
                            for (int i = 0; i < placeholderKey.KeyComponents.Length; i++)
                            { 
                                if (placeholderKey.KeyComponents[i] == node)
                                { 
                                    keyIndex = i; 
                                    break;
                                } 
                            }

                            if (keyIndex != -1)
                            { 
                                // Key value.
                                return key.KeyComponents[keyIndex]; 
                            } 
                            else
                            { 
                                // for simple entries, just return using the markup context for this
                                // populator
                                object value = isNull ? null : node.GetSimpleValue();
                                return PropagatorResult.CreateSimpleValue(flags, value); 
                            }
                        }); 
 
                    return result;
                } 
                #endregion
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Collections.Generic; 
using System.Data.Common;

namespace System.Data.Mapping.Update.Internal
{ 
    internal partial class Propagator
    { 
        private partial class JoinPropagator 
        {
            ///  
            /// Describes the mode of behavior for the .
            /// 
            private enum PopulateMode
            { 
                /// 
                /// Produce a null extension record (for outer joins) marked as modified 
                ///  
                NullModified,
                ///  
                /// Produce a null extension record (for outer joins) marked as preserve
                /// 
                NullPreserve,
                ///  
                /// Produce a placeholder for a record that is known to exist but whose specific
                /// values are unknown. 
                ///  
                Unknown,
            } 

            /// 
            /// Fills in a placeholder with join key data (also performs a clone so that the
            /// placeholder can be reused). 
            /// 
            ///  
            /// Clones of placeholder nodes are created when either the structure of the node 
            /// needs to change or the record markup for the node needs to change.
            ///  
            private static class PlaceholderPopulator
            {
                #region Methods
                ///  
                /// Construct a new placeholder with the shape of the given placeholder. Key values are
                /// injected into the resulting place holder and default values are substituted with 
                /// either propagator constants or progagator nulls depending on the mode established 
                /// by the  flag.
                ///  
                /// 
                /// The key is essentially an array of values. The key map indicates that for a particular
                /// placeholder an expression (keyMap.Keys) corresponds to some ordinal in the key array.
                ///  
                /// Placeholder to clone
                /// Key to substitute 
                /// Key elements in the placeholder (ordinally aligned with 'key') 
                /// Mode of operation.
                /// Translator context. 
                /// Cloned placeholder with key values
                internal static PropagatorResult Populate(PropagatorResult placeholder, CompositeKey key,
                    CompositeKey placeholderKey, PopulateMode mode, UpdateTranslator translator)
                { 
                    EntityUtil.CheckArgumentNull(placeholder, "placeholder");
                    EntityUtil.CheckArgumentNull(key, "key"); 
                    EntityUtil.CheckArgumentNull(placeholderKey, "placeholderKey"); 
                    EntityUtil.CheckArgumentNull(translator, "translator");
 
                    // Figure out which flags to apply to generated elements.
                    bool isNull = mode == PopulateMode.NullModified || mode == PopulateMode.NullPreserve;
                    bool preserve = mode == PopulateMode.NullPreserve || mode == PopulateMode.Unknown;
                    PropagatorFlags flags = PropagatorFlags.NoFlags; 
                    if (!isNull) { flags |= PropagatorFlags.Unknown; } // only null values are known
                    if (preserve) { flags |= PropagatorFlags.Preserve; } 
 
                    PropagatorResult result = placeholder.Replace(node =>
                        { 
                            // See if this is a key element
                            int keyIndex = -1;
                            for (int i = 0; i < placeholderKey.KeyComponents.Length; i++)
                            { 
                                if (placeholderKey.KeyComponents[i] == node)
                                { 
                                    keyIndex = i; 
                                    break;
                                } 
                            }

                            if (keyIndex != -1)
                            { 
                                // Key value.
                                return key.KeyComponents[keyIndex]; 
                            } 
                            else
                            { 
                                // for simple entries, just return using the markup context for this
                                // populator
                                object value = isNull ? null : node.GetSimpleValue();
                                return PropagatorResult.CreateSimpleValue(flags, value); 
                            }
                        }); 
 
                    return result;
                } 
                #endregion
            }
        }
    } 
}

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

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