DataColumnMappingCollection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / Common / DataColumnMappingCollection.cs / 1305376 / DataColumnMappingCollection.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
namespace System.Data.Common {
 
    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.ComponentModel; 
    using System.Data;
    using System.Diagnostics; 
 
    public sealed class DataColumnMappingCollection : MarshalByRefObject, IColumnMappingCollection {
        private List items; // delay creation until AddWithoutEvents, Insert, CopyTo, GetEnumerator 

        public DataColumnMappingCollection() {
        }
 
        // explicit ICollection implementation
        bool System.Collections.ICollection.IsSynchronized { 
            get { return false;} 
        }
        object System.Collections.ICollection.SyncRoot { 
            get { return this;}
        }

        // explicit IList implementation 
        bool System.Collections.IList.IsReadOnly {
            get { return false;} 
        } 
        bool System.Collections.IList.IsFixedSize {
            get { return false;} 
        }
        object System.Collections.IList.this[int index] {
            get {
                return this[index]; 
            }
            set { 
                ValidateType(value); 
                this[index] = (DataColumnMapping) value;
            } 
        }

        // explicit IColumnMappingCollection implementation
        object IColumnMappingCollection.this[string index] { 
            get {
                return this[index]; 
            } 
            set {
                ValidateType(value); 
                this[index] = (DataColumnMapping) value;
            }
        }
        IColumnMapping IColumnMappingCollection.Add(string sourceColumnName, string dataSetColumnName) { 
            return Add(sourceColumnName, dataSetColumnName);
        } 
        IColumnMapping IColumnMappingCollection.GetByDataSetColumn(string dataSetColumnName) { 
            return GetByDataSetColumn(dataSetColumnName);
        } 

        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        ResDescriptionAttribute(Res.DataColumnMappings_Count),
        ] 
        public int Count { 
            get {
                return ((null != items) ? items.Count : 0); 
            }
        }

        private Type ItemType { 
            get { return typeof(DataColumnMapping); }
        } 
 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ResDescriptionAttribute(Res.DataColumnMappings_Item),
        ]
        public DataColumnMapping this[int index] { 
            get {
                RangeCheck(index); 
                return items[index]; 
            }
            set { 
                RangeCheck(index);
                Replace(index, value);
            }
        } 

        [ 
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ResDescriptionAttribute(Res.DataColumnMappings_Item), 
        ]
        public DataColumnMapping this[string sourceColumn] {
            get {
                int index = RangeCheck(sourceColumn); 
                return items[index];
            } 
            set { 
                int index = RangeCheck(sourceColumn);
                Replace(index, value); 
            }
        }

        public int Add(object value) { 
            ValidateType(value);
            Add((DataColumnMapping) value); 
            return Count-1; 
        }
 
        private DataColumnMapping Add(DataColumnMapping value) {
            AddWithoutEvents(value);
            return value;
        } 

        public DataColumnMapping Add(string sourceColumn, string dataSetColumn) { 
            return Add(new DataColumnMapping(sourceColumn, dataSetColumn)); 
        }
 
        public void AddRange(DataColumnMapping[] values) { // V1.0.3300
            AddEnumerableRange(values, false);
        }
 
        public void AddRange(System.Array values) { // V1.2.3300
            AddEnumerableRange(values, false); 
        } 

        /*///  
        public void AddCloneOfRange(IEnumerable values) {
            AddEnumerableRange(values, true);
        }*/
 
        private void AddEnumerableRange(IEnumerable values, bool doClone) {
            if (null == values) { 
                throw ADP.ArgumentNull("values"); 
            }
            foreach(object value in values) { 
                ValidateType(value);
            }
            if (doClone) {
                foreach(ICloneable value in values) { 
                    AddWithoutEvents(value.Clone() as DataColumnMapping);
                } 
            } 
            else {
                foreach(DataColumnMapping value in values) { 
                    AddWithoutEvents(value);
                }
            }
        } 

        private void AddWithoutEvents(DataColumnMapping value) { 
            Validate(-1, value); 
            value.Parent = this;
            ArrayList().Add(value); 
        }

        // implemented as a method, not as a property because the VS7 debugger
        // object browser calls properties to display their value, and we want this delayed 
        private List ArrayList() {
            if (null == this.items) { 
                this.items = new List(); 
            }
            return this.items; 
        }

        public void Clear() {
            if (0 < Count) { 
                ClearWithoutEvents();
            } 
        } 

        private void ClearWithoutEvents() { 
            if (null != items) {
                foreach(DataColumnMapping item in items) {
                    item.Parent = null;
                } 
                items.Clear();
            } 
        } 

        public bool Contains(string value) { 
            return(-1 != IndexOf(value));
        }

        public bool Contains(object value) { 
            return(-1 != IndexOf(value));
        } 
 
        public void CopyTo(Array array, int index) {
            ((ICollection)ArrayList()).CopyTo(array, index); 
        }

        public void CopyTo(DataColumnMapping[] array, int index) {
            ArrayList().CopyTo(array, index); 
        }
 
        public DataColumnMapping GetByDataSetColumn(string value) { 
            int index = IndexOfDataSetColumn(value);
            if (0 > index) { 
                throw ADP.ColumnsDataSetColumn(value);
            }
            return items[index];
        } 

        public IEnumerator GetEnumerator() { 
            return ArrayList().GetEnumerator(); 
        }
 
        public int IndexOf (object value) {
            if (null != value) {
                ValidateType(value);
                for (int i = 0; i < Count; ++i) { 
                    if (items[i] == value) {
                        return i; 
                    } 
                }
            } 
            return -1;
        }

        public int IndexOf(string sourceColumn) { 
            if (!ADP.IsEmpty(sourceColumn)) {
                int count = Count; 
                for (int i = 0; i < count; ++i) { 
                    if (0 == ADP.SrcCompare(sourceColumn, items[i].SourceColumn)) {
                        return i; 
                    }
                }
            }
            return -1; 
        }
 
        public int IndexOfDataSetColumn(string dataSetColumn) { 
            if (!ADP.IsEmpty(dataSetColumn)) {
                int count = Count; 
                for (int i = 0; i < count; ++i) {
                    if ( 0 == ADP.DstCompare(dataSetColumn, items[i].DataSetColumn)) {
                        return i;
                    } 
                }
            } 
            return -1; 
        }
 
        public void Insert(int index, Object value) {
            ValidateType(value);
            Insert(index, (DataColumnMapping) value);
        } 

        public void Insert(int index, DataColumnMapping value) { 
            if (null == value) { 
                throw ADP.ColumnsAddNullAttempt("value");
            } 
            Validate(-1, value);
            value.Parent = this;
            ArrayList().Insert(index, value);
        } 

        private void RangeCheck(int index) { 
            if ((index < 0) || (Count <= index)) { 
                throw ADP.ColumnsIndexInt32(index, this);
            } 
        }

        private int RangeCheck(string sourceColumn) {
            int index = IndexOf(sourceColumn); 
            if (index < 0) {
                throw ADP.ColumnsIndexSource(sourceColumn); 
            } 
            return index;
        } 

        public void RemoveAt(int index) {
            RangeCheck(index);
            RemoveIndex(index); 
        }
 
        public void RemoveAt(string sourceColumn) { 
            int index = RangeCheck(sourceColumn);
            RemoveIndex(index); 
        }

        private void RemoveIndex(int index) {
            Debug.Assert((null != items) && (0 <= index) && (index < Count), "RemoveIndex, invalid"); 
            items[index].Parent = null;
            items.RemoveAt(index); 
        } 

        public void Remove(object value) { 
            ValidateType(value);
            Remove((DataColumnMapping) value);
        }
 
        public void Remove (DataColumnMapping value) {
            if (null == value) { 
                throw ADP.ColumnsAddNullAttempt ("value"); 
            }
            int index = IndexOf (value); 

            if (-1 != index) {
                RemoveIndex (index);
            } 
            else {
                throw ADP.CollectionRemoveInvalidObject(ItemType, this); 
            } 
        }
 
        private void Replace(int index, DataColumnMapping newValue) {
            Debug.Assert((null != items) && (0 <= index) && (index < Count), "RemoveIndex, invalid");
            Validate(index, newValue);
            items[index].Parent = null; 
            newValue.Parent = this;
            items[index] = newValue; 
        } 

        private void ValidateType(object value) { 
            if (null == value) {
                throw ADP.ColumnsAddNullAttempt("value");
            }
            else if (!ItemType.IsInstanceOfType(value)) { 
                throw ADP.NotADataColumnMapping(value);
            } 
        } 

        private void Validate(int index, DataColumnMapping value) { 
            if (null == value) {
                throw ADP.ColumnsAddNullAttempt("value");
            }
            if (null != value.Parent) { 
                if (this != value.Parent) {
                    throw ADP.ColumnsIsNotParent(this); 
                } 
                else if (index != IndexOf(value)) {
                    throw ADP.ColumnsIsParent(this); 
                }
            }

            String name = value.SourceColumn; 
            if (ADP.IsEmpty(name)) {
                index = 1; 
                do { 
                    name = ADP.SourceColumn + index.ToString(System.Globalization.CultureInfo.InvariantCulture);
                    index++; 
                } while (-1 != IndexOf(name));
                value.SourceColumn = name;
            }
            else { 
                ValidateSourceColumn(index, name);
            } 
        } 

        internal void ValidateSourceColumn(int index, string value) { 
            int pindex = IndexOf(value);
            if ((-1 != pindex) && (index != pindex)) { // must be non-null and unique
                throw ADP.ColumnsUniqueSourceColumn(value);
            } 
        }
 
        [ EditorBrowsableAttribute(EditorBrowsableState.Advanced) ] // MDAC 69508 
        static public DataColumn GetDataColumn(DataColumnMappingCollection columnMappings, string sourceColumn, Type dataType, DataTable dataTable, MissingMappingAction mappingAction, MissingSchemaAction schemaAction) {
            if (null != columnMappings) { 
                int index = columnMappings.IndexOf(sourceColumn);
                if (-1 != index) {
#if DEBUG
                    if (AdapterSwitches.DataSchema.TraceInfo) { 
                        Debug.WriteLine("mapping match on SourceColumn \"" + sourceColumn + "\"");
                    } 
#endif 
                    return columnMappings.items[index].GetDataColumnBySchemaAction(dataTable, dataType, schemaAction);
                } 
            }
            if (ADP.IsEmpty(sourceColumn)) {
                throw ADP.InvalidSourceColumn("sourceColumn");
            } 
            switch (mappingAction) {
                case MissingMappingAction.Passthrough: 
#if DEBUG 
                    if (AdapterSwitches.DataSchema.TraceInfo) {
                        Debug.WriteLine("mapping passthrough of SourceColumn \"" + sourceColumn + "\""); 
                    }
#endif
                    return DataColumnMapping.GetDataColumnBySchemaAction(sourceColumn, sourceColumn, dataTable, dataType, schemaAction);
 
                case MissingMappingAction.Ignore:
#if DEBUG 
                    if (AdapterSwitches.DataSchema.TraceWarning) { 
                        Debug.WriteLine("mapping filter of SourceColumn \"" + sourceColumn + "\"");
                    } 
#endif
                    return null;

                case MissingMappingAction.Error: 
#if DEBUG
                    if (AdapterSwitches.DataSchema.TraceError) { 
                        Debug.WriteLine("mapping error on SourceColumn \"" + sourceColumn + "\""); 
                    }
#endif 
                    throw ADP.MissingColumnMapping(sourceColumn);
            }
            throw ADP.InvalidMissingMappingAction(mappingAction);
        } 

        [ EditorBrowsableAttribute(EditorBrowsableState.Advanced) ] // MDAC 69508 
        static public DataColumnMapping GetColumnMappingBySchemaAction(DataColumnMappingCollection columnMappings, string sourceColumn, MissingMappingAction mappingAction) { 
            if (null != columnMappings) {
                int index = columnMappings.IndexOf(sourceColumn); 
                if (-1 != index) {
#if DEBUG
                    if (AdapterSwitches.DataSchema.TraceInfo) {
                        Debug.WriteLine("mapping match on SourceColumn \"" + sourceColumn + "\""); 
                    }
#endif 
                    return columnMappings.items[index]; 
                }
            } 
            if (ADP.IsEmpty(sourceColumn)) {
                throw ADP.InvalidSourceColumn("sourceColumn");
            }
            switch (mappingAction) { 
                case MissingMappingAction.Passthrough:
#if DEBUG 
                    if (AdapterSwitches.DataSchema.TraceInfo) { 
                        Debug.WriteLine("mapping passthrough of SourceColumn \"" + sourceColumn + "\"");
                    } 
#endif
                    return new DataColumnMapping(sourceColumn, sourceColumn);

                case MissingMappingAction.Ignore: 
#if DEBUG
                    if (AdapterSwitches.DataSchema.TraceWarning) { 
                        Debug.WriteLine("mapping filter of SourceColumn \"" + sourceColumn + "\""); 
                    }
#endif 
                    return null;

                case MissingMappingAction.Error:
#if DEBUG 
                    if (AdapterSwitches.DataSchema.TraceError) {
                        Debug.WriteLine("mapping error on SourceColumn \"" + sourceColumn + "\""); 
                    } 
#endif
                    throw ADP.MissingColumnMapping(sourceColumn); 
            }
            throw ADP.InvalidMissingMappingAction(mappingAction);
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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