DataTableMapping.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / Common / DataTableMapping.cs / 1305376 / DataTableMapping.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
namespace System.Data.Common {
 
    using System;
    using System.ComponentModel;
    using System.ComponentModel.Design.Serialization;
    using System.Data; 
    using System.Diagnostics;
    using System.Globalization; 
    using System.Reflection; 

    [ 
    System.ComponentModel.TypeConverterAttribute(typeof(System.Data.Common.DataTableMapping.DataTableMappingConverter))
    ]
    public sealed class DataTableMapping : MarshalByRefObject, ITableMapping, ICloneable {
        private DataTableMappingCollection parent; 
        private DataColumnMappingCollection _columnMappings;
        private string _dataSetTableName; 
        private string _sourceTableName; 

        public DataTableMapping() { 
        }

        public DataTableMapping(string sourceTable, string dataSetTable) {
            SourceTable = sourceTable; 
            DataSetTable = dataSetTable;
        } 
 
        public DataTableMapping(string sourceTable, string dataSetTable, DataColumnMapping[] columnMappings) {
            SourceTable = sourceTable; 
            DataSetTable = dataSetTable;
            if ((null != columnMappings) && (0 < columnMappings.Length)) {
                ColumnMappings.AddRange(columnMappings);
            } 
        }
 
        // explict ITableMapping implementation 
        IColumnMappingCollection ITableMapping.ColumnMappings {
            get { return ColumnMappings; } 
        }

        [
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content), 
        ResCategoryAttribute(Res.DataCategory_Mapping),
        ResDescriptionAttribute(Res.DataTableMapping_ColumnMappings), 
        ] 
        public DataColumnMappingCollection ColumnMappings {
            get { 
                DataColumnMappingCollection columnMappings = _columnMappings;
                if (null == columnMappings) {
                    columnMappings = new DataColumnMappingCollection();
                    _columnMappings = columnMappings; 
                }
                return columnMappings; 
            } 
        }
 
        [
        DefaultValue(""),
        ResCategoryAttribute(Res.DataCategory_Mapping),
        ResDescriptionAttribute(Res.DataTableMapping_DataSetTable), 
        ]
        public string DataSetTable { 
            get { 
                string dataSetTableName = _dataSetTableName;
                return ((null != dataSetTableName) ? dataSetTableName : ADP.StrEmpty); 
            }
            set {
                _dataSetTableName = value;
            } 
        }
 
        internal DataTableMappingCollection Parent { 
            get {
                return parent; 
            }
            set {
                parent = value;
            } 
        }
 
        [ 
        DefaultValue(""),
        ResCategoryAttribute(Res.DataCategory_Mapping), 
        ResDescriptionAttribute(Res.DataTableMapping_SourceTable),
        ]
        public string SourceTable {
            get { 
                string sourceTableName = _sourceTableName;
                return ((null != sourceTableName) ? sourceTableName : ADP.StrEmpty); 
            } 
            set {
                if ((null != Parent) && (0 != ADP.SrcCompare(_sourceTableName, value))) { 
                    Parent.ValidateSourceTable(-1, value);
                }
                _sourceTableName = value;
            } 
        }
 
        object ICloneable.Clone() { 
            DataTableMapping clone = new DataTableMapping(); // MDAC 81448
            clone._dataSetTableName = _dataSetTableName; 
            clone._sourceTableName = _sourceTableName;

            if ((null != _columnMappings) && (0 < ColumnMappings.Count)) {
                DataColumnMappingCollection parameters = clone.ColumnMappings; 
                foreach(ICloneable parameter in ColumnMappings) {
                    parameters.Add(parameter.Clone()); 
                } 
            }
            return clone; 
        }

        [ EditorBrowsableAttribute(EditorBrowsableState.Advanced) ] // MDAC 69508
        public DataColumn GetDataColumn(string sourceColumn, Type dataType, DataTable dataTable, MissingMappingAction mappingAction, MissingSchemaAction schemaAction) { 
            return DataColumnMappingCollection.GetDataColumn(_columnMappings, sourceColumn, dataType, dataTable, mappingAction, schemaAction);
        } 
 
        [ EditorBrowsableAttribute(EditorBrowsableState.Advanced) ] // MDAC 69508
        public DataColumnMapping GetColumnMappingBySchemaAction(string sourceColumn, MissingMappingAction mappingAction) { 
            return DataColumnMappingCollection.GetColumnMappingBySchemaAction(_columnMappings, sourceColumn, mappingAction);
        }

        [ EditorBrowsableAttribute(EditorBrowsableState.Advanced) ] // MDAC 69508 
        public DataTable GetDataTableBySchemaAction(DataSet dataSet, MissingSchemaAction schemaAction) {
            if (null == dataSet) { 
                throw ADP.ArgumentNull("dataSet"); 
            }
            string dataSetTable = DataSetTable; 

            if (ADP.IsEmpty(dataSetTable)) {
#if DEBUG
                if (AdapterSwitches.DataSchema.TraceWarning) { 
                    Debug.WriteLine("explicit filtering of SourceTable \"" + SourceTable + "\"");
                } 
#endif 
                return null;
            } 
            DataTableCollection tables = dataSet.Tables;
            int index = tables.IndexOf(dataSetTable);
            if ((0 <= index) && (index < tables.Count)) {
#if DEBUG 
                if (AdapterSwitches.DataSchema.TraceInfo) {
                    Debug.WriteLine("schema match on DataTable \"" + dataSetTable); 
                } 
#endif
                return tables[index]; 
            }
            switch (schemaAction) {
                case MissingSchemaAction.Add:
                case MissingSchemaAction.AddWithKey: 
#if DEBUG
                    if (AdapterSwitches.DataSchema.TraceInfo) { 
                        Debug.WriteLine("schema add of DataTable \"" + dataSetTable + "\""); 
                    }
#endif 
                    return new DataTable(dataSetTable);

                case MissingSchemaAction.Ignore:
#if DEBUG 
                    if (AdapterSwitches.DataSchema.TraceWarning) {
                        Debug.WriteLine("schema filter of DataTable \"" + dataSetTable + "\""); 
                    } 
#endif
                    return null; 

                case MissingSchemaAction.Error:
#if DEBUG
                    if (AdapterSwitches.DataSchema.TraceError) { 
                        Debug.WriteLine("schema error on DataTable \"" + dataSetTable + "\"");
                    } 
#endif 
                    throw ADP.MissingTableSchema(dataSetTable, SourceTable);
            } 
            throw ADP.InvalidMissingSchemaAction(schemaAction);
        }

        public override String ToString() { 
            return SourceTable;
        } 
 
        sealed internal class DataTableMappingConverter : System.ComponentModel.ExpandableObjectConverter {
 
            // converter classes should have public ctor
            public DataTableMappingConverter() {
            }
 
            override public bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
                if (typeof(InstanceDescriptor) == destinationType) { 
                    return true; 
                }
                return base.CanConvertTo(context, destinationType); 
            }

            override public object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
                if (null == destinationType) { 
                    throw ADP.ArgumentNull("destinationType");
                } 
 
                if ((typeof(InstanceDescriptor) == destinationType) && (value is DataTableMapping)) {
                    DataTableMapping mapping = (DataTableMapping)value; 

                    DataColumnMapping[] columnMappings = new DataColumnMapping[mapping.ColumnMappings.Count];
                    mapping.ColumnMappings.CopyTo(columnMappings, 0);
                    object[] values = new object[] { mapping.SourceTable, mapping.DataSetTable, columnMappings}; 
                    Type[] types = new Type[] { typeof(string), typeof(string), typeof(DataColumnMapping[]) };
 
                    ConstructorInfo ctor = typeof(DataTableMapping).GetConstructor(types); 
                    return new InstanceDescriptor(ctor, values);
                } 
                return base.ConvertTo(context, culture, value, destinationType);
            }
        }
    } 
}

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

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