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1 using System;
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2 using System.Data;
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3 #if !SILVERLIGHT
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4 using System.Data.Common;
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5 #endif
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6 using System.IO;
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7 using System.Text;
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8
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9 namespace BLToolkit.Mapping
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10 {
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11 public class TextDataReader : IDataReader
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12 {
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13 #region Constructors
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14
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15 public TextDataReader(Stream stream)
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16 : this(stream, Map.DefaultSchema)
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17 {
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18 }
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19
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20 public TextDataReader(Stream stream, MappingSchema mappingSchema)
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21 {
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22 GC.SuppressFinalize(this);
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23
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24 if (mappingSchema == null) throw new ArgumentNullException("mappingSchema");
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25
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26 _reader = new StreamReader(stream);
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27 _mappingSchema = mappingSchema;
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28
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29 ReadHeader();
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30 }
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31
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32 #endregion
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33
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34 #region Protected Members
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35
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36 private readonly StreamReader _reader;
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37 private readonly MappingSchema _mappingSchema;
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38 private string _line = string.Empty;
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39 private string[] _names = _empty;
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40 private string[] _values = _empty;
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41 private int _lineNumber = 0;
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42
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43 private static readonly string[] _empty = new string[0];
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44
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45 private bool IsEof
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46 {
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47 get { return _line == null; }
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48 }
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49
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50 private bool ReadNextLine()
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51 {
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52 while (!IsEof)
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53 {
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54 _line = _reader.ReadLine();
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55 _lineNumber++;
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56
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57 if (!string.IsNullOrEmpty(_line) && _line[0] == '*')
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58 return true;
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59 }
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60
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61 return false;
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62 }
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63
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64 private void ReadHeader()
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65 {
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66 while (ReadNextLine())
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67 {
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68 if (_line.StartsWith("*:"))
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69 {
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70 _names = _line.Substring(2).Split(':');
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71 _values = new string[_names.Length];
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72
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73 for (int i = 0; i < _names.Length; i++)
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74 _names[i] = _names[i].Trim();
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75 }
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76 else if (_line.StartsWith("**") || _line.StartsWith("*-"))
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77 break;
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78 }
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79 }
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80
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81 static string Encode(string value)
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82 {
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83 var arr = Convert.FromBase64String(value.Substring(1));
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84
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85 #if SILVERLIGHT
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86 return new UnicodeEncoding(false, true).GetString(arr, 0, arr.Length);
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87 #else
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88 return Encoding.Unicode.GetString(arr);
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89 #endif
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90 }
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91
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92 bool ReadRecord()
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93 {
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94 if (!IsEof)
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95 {
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96 if (_line.StartsWith("*-"))
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97 return false;
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98
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99 if (_line.StartsWith("**") && _line.Length > 3)
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100 {
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101 var values = _line.Substring(3).Split(_line[2]);
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102
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103 for (var i = 0; i < _values.Length && i < values.Length; i++)
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104 {
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105 var value = values[i];
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106
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107 _values[i] =
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108 value.Length == 0? null:
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109 value[0] == '*'? value.Substring(1):
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110 value[0] == '+'? Encode(value.Substring(1)) : value;
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111 }
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112
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113 ReadNextLine();
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114
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115 return true;
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116 }
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117
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118 throw new MappingException(
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119 string.Format("Invalid data format in the line {0}.", _lineNumber));
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120 }
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121
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122 return false;
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123 }
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124
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125 #endregion
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126
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127 #region IDataReader Members
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128
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129 public virtual void Close()
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130 {
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131 _line = null;
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132 }
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133
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134 public virtual int Depth
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135 {
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136 get { return 0; }
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137 }
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138
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139 public virtual Type GetFieldType(int index)
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140 {
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141 return typeof(string);
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142 }
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143
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144 public virtual string GetName(int index)
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145 {
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146 return _names[index];
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147 }
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148
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149 #if !SILVERLIGHT
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150 private DataTable _schemaTable;
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151
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152 public virtual DataTable GetSchemaTable()
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153 {
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154 if (_schemaTable == null)
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155 {
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156 _schemaTable = new DataTable("SchemaTable");
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157
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158 _schemaTable.Columns.AddRange(new DataColumn[]
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159 {
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160 new DataColumn(SchemaTableColumn.ColumnName, typeof(string)),
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161 new DataColumn(SchemaTableColumn.ColumnOrdinal, typeof(int)),
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162 new DataColumn(SchemaTableColumn.ColumnSize, typeof(int)),
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163 new DataColumn(SchemaTableColumn.NumericPrecision, typeof(short)),
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164 new DataColumn(SchemaTableColumn.NumericScale, typeof(short)),
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165 new DataColumn(SchemaTableColumn.DataType, typeof(Type)),
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166 new DataColumn(SchemaTableColumn.NonVersionedProviderType, typeof(int)),
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167 new DataColumn(SchemaTableColumn.ProviderType, typeof(int)),
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168 new DataColumn(SchemaTableColumn.IsLong, typeof(bool)),
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169 new DataColumn(SchemaTableColumn.AllowDBNull, typeof(bool)),
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170 new DataColumn(SchemaTableColumn.IsUnique, typeof(bool)),
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171 new DataColumn(SchemaTableColumn.IsKey, typeof(bool)),
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172 new DataColumn(SchemaTableColumn.BaseSchemaName, typeof(string)),
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173 new DataColumn(SchemaTableColumn.BaseTableName, typeof(string)),
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174 new DataColumn(SchemaTableColumn.BaseColumnName, typeof(string)),
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175 new DataColumn(SchemaTableColumn.IsAliased, typeof(bool)),
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176 new DataColumn(SchemaTableColumn.IsExpression, typeof(bool)),
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177 });
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178
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179 for (int i = 0; i < _names.Length; i++)
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180 {
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181 DataRow row = _schemaTable.NewRow();
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182
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183 row[SchemaTableColumn.ColumnName] = _names[i];
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184 row[SchemaTableColumn.ColumnOrdinal] = i;
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185 row[SchemaTableColumn.ColumnSize] = (int)byte.MaxValue;
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186 row[SchemaTableColumn.NumericPrecision] = (short)0;
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187 row[SchemaTableColumn.NumericScale] = (short)0;
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188 row[SchemaTableColumn.DataType] = typeof(string);
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189 row[SchemaTableColumn.NonVersionedProviderType] = 1;
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190 row[SchemaTableColumn.ProviderType] = 1;
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191 row[SchemaTableColumn.IsLong] = false;
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192 row[SchemaTableColumn.AllowDBNull] = true;
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193 row[SchemaTableColumn.IsUnique] = false;
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194 row[SchemaTableColumn.IsKey] = false;
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195 row[SchemaTableColumn.BaseSchemaName] = string.Empty;
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196 row[SchemaTableColumn.BaseTableName] = string.Empty;
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197 row[SchemaTableColumn.BaseColumnName] = string.Empty;
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198 row[SchemaTableColumn.IsAliased] = false;
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199 row[SchemaTableColumn.IsExpression] = false;
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200
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201 _schemaTable.Rows.Add(row);
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202 }
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203 }
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204
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205 return _schemaTable;
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206 }
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207
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208 #endif
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209
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210 public virtual int FieldCount
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211 {
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212 get { return _names.Length; }
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213 }
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214
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215 public virtual bool IsClosed
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216 {
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217 get { return IsEof; }
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218 }
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219
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220 public virtual bool NextResult()
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221 {
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222 ReadHeader();
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223 return !IsEof;
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224 }
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225
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226 public virtual bool Read()
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227 {
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228 return ReadRecord();
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229 }
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230
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231 public virtual int RecordsAffected
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232 {
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233 get { return -1; }
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234 }
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235
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236 #endregion
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237
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238 #region IDisposable Members
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239
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240 public virtual void Dispose()
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241 {
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242 }
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243
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244 #endregion
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245
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246 #region IDataRecord Members
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247
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248 public virtual bool GetBoolean(int i)
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249 {
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250 return _mappingSchema.ConvertToBoolean(_values[i]);
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251 }
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252
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253 public virtual byte GetByte(int i)
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254 {
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255 return _mappingSchema.ConvertToByte(_values[i]);
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256 }
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257
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258 public virtual long GetBytes(int i, long fieldOffset, byte[] buffer, int bufferoffset, int length)
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259 {
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260 throw new Exception("The method or operation is not implemented.");
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261 }
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262
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263 public virtual char GetChar(int i)
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264 {
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265 return _mappingSchema.ConvertToChar(_values[i]);
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266 }
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267
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268 public virtual long GetChars(int i, long fieldoffset, char[] buffer, int bufferoffset, int length)
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269 {
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270 throw new Exception("The method or operation is not implemented.");
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271 }
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272
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273 public virtual IDataReader GetData(int i)
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274 {
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275 throw new Exception("The method or operation is not implemented.");
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276 }
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277
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278 public virtual string GetDataTypeName(int i)
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279 {
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280 return typeof(string).FullName;
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281 }
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282
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283 public virtual DateTime GetDateTime(int i)
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284 {
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285 return _mappingSchema.ConvertToDateTime(_values[i]);
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286 }
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287
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288 public virtual DateTimeOffset GetDateTimeOffset(int i)
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289 {
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290 return _mappingSchema.ConvertToDateTimeOffset(_values[i]);
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291 }
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292
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293 public virtual decimal GetDecimal(int i)
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294 {
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295 return _mappingSchema.ConvertToDecimal(_values[i]);
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296 }
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297
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298 public virtual double GetDouble(int i)
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299 {
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300 return _mappingSchema.ConvertToDouble(_values[i]);
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301 }
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302
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303 public virtual float GetFloat(int i)
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304 {
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305 return _mappingSchema.ConvertToSingle(_values[i]);
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306 }
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307
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308 public virtual Guid GetGuid(int i)
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309 {
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310 return _mappingSchema.ConvertToGuid(_values[i]);
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311 }
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312
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313 public virtual short GetInt16(int i)
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314 {
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315 return _mappingSchema.ConvertToInt16(_values[i]);
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316 }
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317
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318 public virtual int GetInt32(int i)
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319 {
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320 return _mappingSchema.ConvertToInt32(_values[i]);
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321 }
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322
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323 public virtual long GetInt64(int i)
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324 {
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325 return _mappingSchema.ConvertToInt64(_values[i]);
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326 }
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327
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328 public virtual int GetOrdinal(string name)
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329 {
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330 for (int i = 0; i < _names.Length; i++)
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331 if (_names[i] == name)
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332 return i;
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333
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334 return -1;
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335 }
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336
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337 public virtual string GetString(int i)
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338 {
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339 return _values[i];
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340 }
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341
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342 public virtual object GetValue(int i)
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343 {
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344 return _values[i];
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345 }
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346
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347 public virtual int GetValues(object[] values)
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348 {
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349 int n = Math.Min(values.Length, _values.Length);
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350
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351 for (int i = 0; i < n; i++)
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352 values[i] = _values[i];
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353
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354 return n;
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355 }
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356
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357 public virtual bool IsDBNull(int i)
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358 {
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359 return _values[i] == null;
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360 }
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361
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362 public virtual object this[string name]
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363 {
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364 get
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365 {
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366 for (int i = 0; i < _names.Length; i++)
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367 if (_names[i] == name)
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368 return _values[i];
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369
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370 throw new ArgumentException(string.Format("Invalid field name '{0}'", name));
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371 }
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372 }
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373
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374 public virtual object this[int i]
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375 {
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376 get { return _values[i]; }
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377 }
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378
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379 #endregion
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380 }
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381 }
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