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//------------------------------------------------------------------------------
// <copyright file="DataRecordInternal.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
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;
}
}
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