Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / DataRecordInternal.cs / 1 / DataRecordInternal.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.Common { using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Data.ProviderBase; using System.Diagnostics; using System.IO; using System.Threading; internal sealed class DataRecordInternal : DbDataRecord, ICustomTypeDescriptor { private SchemaInfo[] _schemaInfo; private object[] _values; private PropertyDescriptorCollection _propertyDescriptors; private FieldNameLookup _fieldNameLookup; // MDAC 69015 // copy all runtime data information internal DataRecordInternal(SchemaInfo[] schemaInfo, object[] values, PropertyDescriptorCollection descriptors, FieldNameLookup fieldNameLookup) { Debug.Assert(null != schemaInfo, "invalid attempt to instantiate DataRecordInternal with null schema information"); Debug.Assert(null != values, "invalid attempt to instantiate DataRecordInternal with null value[]"); _schemaInfo = schemaInfo; _values = values; _propertyDescriptors = descriptors; _fieldNameLookup = fieldNameLookup; } // copy all runtime data information internal DataRecordInternal(object[] values, PropertyDescriptorCollection descriptors, FieldNameLookup fieldNameLookup) { Debug.Assert(null != values, "invalid attempt to instantiate DataRecordInternal with null value[]"); _values = values; _propertyDescriptors = descriptors; _fieldNameLookup = fieldNameLookup; } internal void SetSchemaInfo(SchemaInfo[] schemaInfo) { Debug.Assert(null == _schemaInfo, "invalid attempt to override DataRecordInternal schema information"); _schemaInfo = schemaInfo; } public override int FieldCount { get { return _schemaInfo.Length; } } public override int GetValues(object[] values) { if (null == values) { throw ADP.ArgumentNull("values"); } int copyLen = (values.Length < _schemaInfo.Length) ? values.Length : _schemaInfo.Length; for (int i = 0; i < copyLen; i++) { values[i] = _values[i]; } return copyLen; } public override string GetName(int i) { return _schemaInfo[i].name; } public override object GetValue(int i) { return _values[i]; } public override string GetDataTypeName(int i) { return _schemaInfo[i].typeName; } public override Type GetFieldType(int i) { return _schemaInfo[i].type; } public override int GetOrdinal(string name) { // MDAC 69015 return _fieldNameLookup.GetOrdinal(name); // MDAC 71470 } public override object this[int i] { get { return GetValue(i); } } public override object this[string name] { get { return GetValue(GetOrdinal(name)); } } public override bool GetBoolean(int i) { return((bool) _values[i]); } public override byte GetByte(int i) { return((byte) _values[i]); } public override long GetBytes(int i, long dataIndex, byte[] buffer, int bufferIndex, int length) { int cbytes = 0; int ndataIndex; byte[] data = (byte[])_values[i]; cbytes = data.Length; // since arrays can't handle 64 bit values and this interface doesn't // allow chunked access to data, a dataIndex outside the rang of Int32 // is invalid if (dataIndex > Int32.MaxValue) { throw ADP.InvalidSourceBufferIndex(cbytes, dataIndex, "dataIndex"); } ndataIndex = (int)dataIndex; // if no buffer is passed in, return the number of characters we have if (null == buffer) return cbytes; try { if (ndataIndex < cbytes) { // help the user out in the case where there's less data than requested if ((ndataIndex + length) > cbytes) cbytes = cbytes - ndataIndex; else cbytes = length; } // until arrays are 64 bit, we have to do these casts Array.Copy(data, ndataIndex, buffer, bufferIndex, (int)cbytes); } catch (Exception e) { // if (ADP.IsCatchableExceptionType(e)) { cbytes = data.Length; if (length < 0) throw ADP.InvalidDataLength(length); // if bad buffer index, throw if (bufferIndex < 0 || bufferIndex >= buffer.Length) throw ADP.InvalidDestinationBufferIndex(length, bufferIndex, "bufferIndex"); // if bad data index, throw if (dataIndex < 0 || dataIndex >= cbytes) throw ADP.InvalidSourceBufferIndex(length, dataIndex, "dataIndex"); // if there is not enough room in the buffer for data if (cbytes + bufferIndex > buffer.Length) throw ADP.InvalidBufferSizeOrIndex(cbytes, bufferIndex); } throw; } return cbytes; } public override char GetChar(int i) { string s; s = (string)_values[i]; char[] c = s.ToCharArray(); return c[0]; } public override long GetChars(int i, long dataIndex, char[] buffer, int bufferIndex, int length) { int cchars = 0; string s; int ndataIndex; // if the object doesn't contain a char[] then the user will get an exception s = (string)_values[i]; char[] data = s.ToCharArray(); cchars = data.Length; // since arrays can't handle 64 bit values and this interface doesn't // allow chunked access to data, a dataIndex outside the rang of Int32 // is invalid if (dataIndex > Int32.MaxValue) { throw ADP.InvalidSourceBufferIndex(cchars, dataIndex, "dataIndex"); } ndataIndex = (int)dataIndex; // if no buffer is passed in, return the number of characters we have if (null == buffer) return cchars; try { if (ndataIndex < cchars) { // help the user out in the case where there's less data than requested if ((ndataIndex + length) > cchars) cchars = cchars - ndataIndex; else cchars = length; } Array.Copy(data, ndataIndex, buffer, bufferIndex, cchars); } catch (Exception e) { // if (ADP.IsCatchableExceptionType(e)) { cchars = data.Length; if (length < 0) throw ADP.InvalidDataLength(length); // if bad buffer index, throw if (bufferIndex < 0 || bufferIndex >= buffer.Length) throw ADP.InvalidDestinationBufferIndex(buffer.Length, bufferIndex, "bufferIndex"); // if bad data index, throw if (ndataIndex < 0 || ndataIndex >= cchars) throw ADP.InvalidSourceBufferIndex(cchars, dataIndex, "dataIndex"); // if there is not enough room in the buffer for data if (cchars + bufferIndex > buffer.Length) throw ADP.InvalidBufferSizeOrIndex(cchars, bufferIndex); } throw; } return cchars; } public override Guid GetGuid(int i) { return ((Guid)_values[i]); } public override Int16 GetInt16(int i) { return((Int16) _values[i]); } public override Int32 GetInt32(int i) { return((Int32) _values[i]); } public override Int64 GetInt64(int i) { return((Int64) _values[i]); } public override float GetFloat(int i) { return((float) _values[i]); } public override double GetDouble(int i) { return((double) _values[i]); } public override string GetString(int i) { return((string) _values[i]); } public override Decimal GetDecimal(int i) { return((Decimal) _values[i]); } public override DateTime GetDateTime(int i) { return((DateTime) _values[i]); } public override bool IsDBNull(int i) { object o = _values[i]; return (null == o || Convert.IsDBNull(o)); } // // ICustomTypeDescriptor // AttributeCollection ICustomTypeDescriptor.GetAttributes() { return new AttributeCollection((Attribute[])null); } string ICustomTypeDescriptor.GetClassName() { return null; } string ICustomTypeDescriptor.GetComponentName() { return null; } TypeConverter ICustomTypeDescriptor.GetConverter() { return null; } EventDescriptor ICustomTypeDescriptor.GetDefaultEvent() { return null; } PropertyDescriptor ICustomTypeDescriptor.GetDefaultProperty() { return null; } object ICustomTypeDescriptor.GetEditor(Type editorBaseType) { return null; } EventDescriptorCollection ICustomTypeDescriptor.GetEvents() { return new EventDescriptorCollection(null); } EventDescriptorCollection ICustomTypeDescriptor.GetEvents(Attribute[] attributes) { return new EventDescriptorCollection(null); } PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties() { return((ICustomTypeDescriptor)this).GetProperties(null); } PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties(Attribute[] attributes) { if(_propertyDescriptors == null) { _propertyDescriptors = new PropertyDescriptorCollection(null); } return _propertyDescriptors; } object ICustomTypeDescriptor.GetPropertyOwner(PropertyDescriptor pd) { return this; } } // this doesn't change per record, only alloc once internal struct SchemaInfo { public string name; public string typeName; public Type type; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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