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annotate pkg/imports/wx.go @ 1680:de8089944b19

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Waterway axis import: Started extracting properties from the features.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 27 Dec 2018 13:35:51 +0100
parents 2dc7768be0e4
children 4d6ce621379e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package imports
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15
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16 import (
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17 "context"
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18 "database/sql"
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19 "encoding/json"
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20 "fmt"
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21 "io"
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22 "log"
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23 "strings"
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24 "time"
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25
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26 "gemma.intevation.de/gemma/pkg/common"
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27 "gemma.intevation.de/gemma/pkg/wfs"
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28 )
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29
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30 type WaterwayAxis struct {
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31 URL string `json:"url"`
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32 FeatureType string `json:"feature-type"`
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33 SortBy string `json:"sort-by"`
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34 }
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35
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36 const WXJobKind JobKind = "wx"
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37
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38 type wxJobCreator struct{}
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39
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40 func init() {
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41 RegisterJobCreator(WXJobKind, wxJobCreator{})
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42 }
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43
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44 func (wxJobCreator) Description() string {
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45 return "waterway axis"
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46 }
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47
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48 func (wxJobCreator) Create(_ JobKind, data string) (Job, error) {
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49 wx := new(WaterwayAxis)
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50 if err := common.FromJSONString(data, wx); err != nil {
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51 return nil, err
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52 }
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53 return wx, nil
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54 }
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55
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56 func (wxJobCreator) Depends() []string {
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57 return []string{
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58 "waterway_axis",
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59 }
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60 }
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61
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62 // StageDone is a NOP for waterway axis imports.
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63 func (wxJobCreator) StageDone(context.Context, *sql.Tx, int64) error {
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64 return nil
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65 }
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66
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67 // CleanUp for waterway imports is a NOP.
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68 func (*WaterwayAxis) CleanUp() error { return nil }
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69
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70 type waterwayAxisProperties struct {
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71 ObjNam string `json:"hydro_objnam"`
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72 NObjNnm *string `json:"hydro_nobjnm"`
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73 }
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74
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75 // Do executes the actual waterway exis import.
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76 func (wx *WaterwayAxis) Do(
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77 ctx context.Context,
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78 importID int64,
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79 conn *sql.Conn,
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80 feedback Feedback,
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81 ) (interface{}, error) {
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82
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83 start := time.Now()
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84
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85 feedback.Info("Import waterway axis")
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86
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87 feedback.Info("Loading capabilities from %s", wx.URL)
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88 caps, err := wfs.GetCapabilities(wx.URL)
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89 if err != nil {
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90 feedback.Error("Loading capabilities failed: %v", err)
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91 return nil, err
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92 }
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93
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94 ft := caps.FindFeatureType(wx.FeatureType)
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95 if ft == nil {
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96 err := fmt.Errorf("Unknown feature type '%s'", wx.FeatureType)
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97 feedback.Error("%v", err)
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98 return nil, err
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99 }
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100
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101 urls, err := wfs.GetFeaturesGET(
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102 caps, wx.FeatureType, "application/json", wx.SortBy)
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103 if err != nil {
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104 feedback.Error("Cannot create GetFeature URLs. %v", err)
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105 return nil, err
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106 }
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107
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108 var (
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109 crsName string
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110 unsupportedTypes = map[string]int{}
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111 missingProperties int
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112 badProperties int
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113 )
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114
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115 if err := wfs.DownloadURLs(urls, func(r io.Reader) error {
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116 rfc, err := wfs.ParseRawFeatureCollection(r)
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117 if err != nil {
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118 return err
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119 }
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120 if crsName != "" && rfc.CRS != nil {
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121 crsName = rfc.CRS.Properties.Name
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122 }
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123
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124 // No features -> ignore.
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125 if rfc.Features == nil {
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126 return nil
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127 }
1680
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128
1679
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129 for _, feature := range rfc.Features {
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130 if feature.Properties == nil {
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131 missingProperties++
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132 continue
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133 }
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134
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135 var props waterwayAxisProperties
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136
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137 if err := json.Unmarshal(*feature.Properties, &props); err != nil {
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138 badProperties++
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139 continue
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140 }
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141
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142 log.Printf("properties: %s\n", props.ObjNam)
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143
1679
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144 switch feature.Geometry.Type {
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145 case "LineString":
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146 // TODO: Parse concrete features.
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147 case "MultiLineString":
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148 // TODO: Parse concrete features.
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149 default:
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150 unsupportedTypes[feature.Geometry.Type]++
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151 }
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152 }
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153 return nil
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154 }); err != nil {
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155 feedback.Error("Downloading features failed: %v", err)
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156 return nil, err
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157 }
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158
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159 if badProperties > 0 {
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160 feedback.Warn("Bad properties: %d", badProperties)
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161 }
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162
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163 if missingProperties > 0 {
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164 feedback.Warn("Missing properties: %d", missingProperties)
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165 }
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166
1679
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167 if len(unsupportedTypes) != 0 {
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168 var b strings.Builder
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169 for t, c := range unsupportedTypes {
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170 if b.Len() > 0 {
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171 b.WriteString(", ")
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172 }
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173 b.WriteString(fmt.Sprintf("%s: %d", t, c))
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174 }
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175 feedback.Warn("Unsupported types found: %s", b.String())
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176 }
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177
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178 if crsName == "" {
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179 crsName = ft.DefaultCRS
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180 }
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181
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182 epsg, err := wfs.CRSToEPSG(crsName)
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183 if err != nil {
2dc7768be0e4 Waterway axis import: More on reading data from WFS. TODO: Parse to concrete features.
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184 feedback.Error("Unsupported CRS name '%s'", crsName)
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185 return nil, err
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186 }
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diff changeset
187
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188 feedback.Info("using ESPG: %d", epsg)
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diff changeset
189
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190 // TODO: Store extracted features.
2dc7768be0e4 Waterway axis import: More on reading data from WFS. TODO: Parse to concrete features.
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diff changeset
191
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diff changeset
192 feedback.Info("Storing took %s", time.Since(start))
2dc7768be0e4 Waterway axis import: More on reading data from WFS. TODO: Parse to concrete features.
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diff changeset
193
1675
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parents:
diff changeset
194 return nil, nil
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parents:
diff changeset
195 }