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annotate pkg/wfs/global.go @ 2702:d7ef169fd0d3

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WFS downloader: More on downloading GML. WIP.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 18 Mar 2019 15:45:42 +0100
parents 49ce3c11ca72
children 3956de9b6b32
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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) 2019 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 wfs
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15
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16 import (
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17 "io"
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18 "log"
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19 "os/exec"
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20 )
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21
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22 var (
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23 FormatGeoJSON = []string{"geojson", "application/json"}
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24 FormatGML = []string{
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25 "gml2", "gml3", "gml32",
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26 "text/xml; subtype=gml/2.1.2",
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27 "text/xml; subtype=gml/3.1.1",
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28 "text/xml; subtype=gml/3.2",
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29 }
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30 )
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31
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32 type (
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33 Downloader interface {
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34 Download(handler func(string, io.Reader) error) error
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35 }
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36
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37 GeoJSONDownloader []string
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38 GMLDownloader []string
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39 )
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40
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41 var GetFeatures = setup()
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42
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43 func setup() func(*Capabilities, string, string) (Downloader, error) {
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44 path, err := exec.LookPath("ogr2ogr")
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45 if err != nil {
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46 log.Println("info: ogr2ogr not installed. Using direct GeoJSON WFS download.")
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47 return GetFeaturesGeoJSON
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48 }
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49 log.Printf("info: ogr2ogr found at %s. Using GML WFS download.\n", path)
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50 return GetFeaturesGML
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51 }
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52
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53 func GetFeaturesGeoJSON(
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54 caps *Capabilities,
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55 featureTypeName string,
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56 sortBy string,
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57 ) (Downloader, error) {
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58 urls, err := GetFeaturesGET(
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59 caps,
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60 featureTypeName,
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61 FormatGeoJSON,
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62 sortBy)
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63 return GeoJSONDownloader(urls), err
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64 }
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65
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66 func GetFeaturesGML(
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67 caps *Capabilities,
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68 featureTypeName string,
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69 sortBy string,
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70 ) (Downloader, error) {
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71 urls, err := GetFeaturesGET(
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72 caps,
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73 featureTypeName,
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74 FormatGML,
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75 sortBy)
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76 return GMLDownloader(urls), err
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77 }
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78
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79 func (gjd GeoJSONDownloader) Download(handler func(string, io.Reader) error) error {
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80 return DownloadURLs([]string(gjd), handler)
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81 }
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82
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83 func (gmd GMLDownloader) Download(handler func(string, io.Reader) error) error {
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84 // TODO: Implement, me!
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85 return nil
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86 }