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annotate Postarc/Postarc/Feature/FeatureCursor.cs @ 0:1aca3d413885 tip

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Initial import of Postarc
author Christian Lins <christian.lins@intevation.de>
date Fri, 05 Oct 2012 23:55:06 +0200
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0
1aca3d413885 Initial import of Postarc
Christian Lins <christian.lins@intevation.de>
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1 /*
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2 * Postarc
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3 *
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4 * Author:
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5 * Christian Lins <christian.lins@intevation.de>
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6 *
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7 * Copyright:
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8 * Copyright (C) 2012 Intevation GmbH <http://www.intevation.de/>
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9 *
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10 * This program is free software: you can redistribute it and/or modify
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Christian Lins <christian.lins@intevation.de>
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11 * it under the terms of the GNU Lesser General Public License as published by
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Christian Lins <christian.lins@intevation.de>
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12 * the Free Software Foundation, either version 3 of the License, or
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Christian Lins <christian.lins@intevation.de>
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13 * (at your option) any later version.
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14 *
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15 * This program is distributed in the hope that it will be useful,
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16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 * GNU General Public License for more details.
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19 *
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20 * You should have received a copy of the GNU Lesser General Public License
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Christian Lins <christian.lins@intevation.de>
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21 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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22 */
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23
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24 using System;
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25 using System.Collections.Generic;
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26 using System.Linq;
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27 using ESRI.ArcGIS.Geodatabase;
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28 using System.Text;
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29 using Npgsql;
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30 using System.Diagnostics;
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31
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32 namespace Postarc.Feature
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33 {
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34 static class StringExtension
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35 {
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36 public static string Replace(this string str, string oldValue, string newValue, StringComparison comparison)
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37 {
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38 StringBuilder sb = new StringBuilder();
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39
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40 int previousIndex = 0;
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41 int index = str.IndexOf(oldValue, comparison);
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42 while (index != -1)
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43 {
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44 sb.Append(str.Substring(previousIndex, index - previousIndex));
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45 sb.Append(newValue);
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46 index += oldValue.Length;
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47
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48 previousIndex = index;
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49 index = str.IndexOf(oldValue, index, comparison);
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50 }
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51 sb.Append(str.Substring(previousIndex));
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52
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53 return sb.ToString();
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54 }
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55 }
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56
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57 class FeatureCursor : IFeatureCursor, ICursor
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58 {
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59 /// <summary>
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60 /// Currently Postarc requires an Postarc_ID column in the PostGIS table
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61 /// which is mapped to ArcGIS' OID.
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62 /// </summary>
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63 public const string POSTARC_OID_COLUMN = "oid";
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64 public const string POSTARC_SHAPE_COLUMN = "shape";
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65 public const string ARCGIS_OID_COLUMN = "oid";
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66
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67 protected PostGISConnection connection;
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68 protected NpgsqlConnection npgsqlConnection;
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69 protected FeatureClass featureClass;
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70 protected IFields fields;
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71 protected NpgsqlDataReader reader;
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72
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73 private int oidIdx = -1;
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74
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75 public FeatureCursor(FeatureClass featClass, PostGISConnection conn, IQueryFilter filter)
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76 {
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77 this.featureClass = featClass;
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78 this.connection = conn;
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79
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80 // If a QueryFilter is given, we must adapt our SQL query
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81 string subFields = AllFields();
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82 string whereClause = "";
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83 if (filter != null)
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84 {
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85 /*if (!filter.SubFields.Equals("*"))
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86 {
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87 subFields = filter.SubFields;
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88 if (!subFields.Contains(POSTARC_OID_COLUMN) && !subFields.Equals("*"))
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89 {
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90 subFields = subFields + "," + POSTARC_OID_COLUMN;
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91 }
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92 }*/
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93
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94 whereClause = filter.WhereClause;
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95 if(whereClause != null && !whereClause.Equals(""))
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96 {
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97 whereClause = " WHERE " + whereClause;
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98 }
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99 }
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100
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101 subFields = subFields.Replace(
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102 POSTARC_SHAPE_COLUMN,
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103 "ST_AsText(" + POSTARC_SHAPE_COLUMN + ") AS " + POSTARC_SHAPE_COLUMN);
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104
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105 this.npgsqlConnection = conn.Open();
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106 NpgsqlCommand cmd = new NpgsqlCommand(
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107 "SELECT " + subFields + " FROM " + featClass.TableName + whereClause + " ORDER BY " + POSTARC_OID_COLUMN,
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108 npgsqlConnection);
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109 this.reader = cmd.ExecuteReader();
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110
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111 // Build the fields
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112 IFieldsEdit fieldsEdit = new FieldsClass();
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113 for (int n = 0; n < reader.FieldCount; n++)
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114 {
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115 string fieldName = reader.GetName(n);
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116 if (fieldName.Equals(POSTARC_OID_COLUMN, StringComparison.OrdinalIgnoreCase))
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117 {
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118 fieldName = ARCGIS_OID_COLUMN;
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119 oidIdx = n;
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120 }
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121 int fidx = featClass.FindField(fieldName);
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122 IField field = featClass.Fields.get_Field(fidx);
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123 fieldsEdit.AddField(field);
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124 }
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125 this.fields = fieldsEdit as IFields;
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126 }
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127
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128 protected string AllFields()
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129 {
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130 StringBuilder buf = new StringBuilder();
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131
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132 for (int n = 0; n < featureClass.Fields.FieldCount; n++)
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133 {
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134 buf.Append(featureClass.Fields.get_Field(n).Name);
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135 if (n < featureClass.Fields.FieldCount - 1)
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136 {
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137 buf.Append(",");
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138 }
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139 }
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140
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141 return buf.ToString();
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142 }
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143
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144 public void DeleteFeature()
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145 {
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146 // Not implemented
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147 }
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148
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149 public IFields Fields
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150 {
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151 get
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152 {
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153 return this.fields;
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154 }
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155 }
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156
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157 public int FindField(string name)
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158 {
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159 return this.Fields.FindField(name);
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160 }
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161
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162 public void Flush()
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163 {
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164 // TODO: Not implemented
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165 }
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166
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167 public object InsertFeature(IFeatureBuffer buffer)
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168 {
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169 Debug.WriteLine("FeatureCursor::InsertFeature(): FIXME");
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170 return null; // TODO: Not implemented
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171 }
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172
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173 public IFeature NextFeature()
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174 {
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175 if (this.reader.Read())
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176 {
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177 Feature feature = new Feature(featureClass, Fields, oidIdx, this.reader);
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178 return feature;
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179 }
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180 this.reader.Close(); // We've reached the last feature
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181 return null;
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182 }
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183
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184 public void UpdateFeature(IFeature Object)
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185 {
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186 // TODO: Not implemented
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187 Debug.WriteLine("FeatureCursor::UpdateFeature(): FIXME");
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188 }
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189
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190 public void DeleteRow()
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191 {
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192 // TODO: Not implemented
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193 Debug.WriteLine("FeatureCursor::DeleteRow(): FIXME");
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194 }
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195
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196 public object InsertRow(IRowBuffer buffer)
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197 {
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198 // TODO: Not implemented
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199 Debug.WriteLine("FeatureCursor::InsertRow(): FIXME");
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200 return null;
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201 }
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202
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203 public IRow NextRow()
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204 {
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205 return NextFeature();
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206 }
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207
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208 public void UpdateRow(IRow Row)
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209 {
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210 // TODO: Not implemented
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211 Debug.WriteLine("FeatureCursor::UpdateRow(): FIXME");
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212 }
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213 }
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214 }
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