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annotate pkg/models/cross.go @ 633:6093016fac88

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Cross sections: started with implementation of web service (WIP).
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 12 Sep 2018 19:51:46 +0200
parents
children 7a867e48b3c2
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633
6093016fac88 Cross sections: started with implementation of web service (WIP).
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1 package models
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2
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3 import (
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4 "encoding/json"
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5 "errors"
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6 "time"
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7 )
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8
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9 type (
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10 GeoJSONFeature string
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11 GeoJSONLineStringType string
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12
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13 GeoJSONDate struct{ time.Time }
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14
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15 GeoJSONLineString struct {
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16 Type GeoJSONLineStringType `json:"type"`
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17 }
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18
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19 GeoJSONCoordinate struct {
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20 Lon float64
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21 Lat float64
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22 }
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23
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24 CrossSectionInputProperties struct {
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25 Bottleneck string `json:"bottleneck"`
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26 Date GeoJSONDate `json:"date"`
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27 }
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28
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29 CrossSectionInput struct {
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30 Type GeoJSONFeature `json:"type"`
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31 Geometry GeoJSONLineString `json:"geometry"`
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32 Coordinates []GeoJSONCoordinate `json:"coordinates"`
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33 Properties CrossSectionInputProperties `json:"properties"`
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34 }
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35 )
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36
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37 var (
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38 errNoGeoJSONFeature = errors.New("Not a valid GeoJSON feature")
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39 errNoGeoJSONLineStringType = errors.New("Not a valid GeoJSON linestring type")
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40 )
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41
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42 func (d *GeoJSONDate) UnmarshalJSON(data []byte) error {
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43 var s string
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44 if err := json.Unmarshal(data, &s); err != nil {
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45 return err
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46 }
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47 t, err := time.Parse("2006-01-02", s)
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48 if err != nil {
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49 return err
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50 }
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51 *d = GeoJSONDate{t}
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52 return nil
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53 }
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54
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55 func (c *GeoJSONCoordinate) UnmarshalJSON(data []byte) error {
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56 pos := make([]float64, 2)
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57 if err := json.Unmarshal(data, &pos); err != nil {
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58 return err
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59 }
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60 *c = GeoJSONCoordinate{Lon: pos[0], Lat: pos[1]}
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61 return nil
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62 }
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63
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64 func (t *GeoJSONFeature) UnmarshalJSON(data []byte) error {
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65 var s string
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66 if err := json.Unmarshal(data, &s); err != nil {
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67 return err
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68 }
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69 if s != "Feature" {
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70 return errNoGeoJSONFeature
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71 }
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72 *t = GeoJSONFeature(s)
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73 return nil
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74 }
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75
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76 func (t *GeoJSONLineStringType) UnmarshalJSON(data []byte) error {
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77 var s string
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78 if err := json.Unmarshal(data, &s); err != nil {
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79 return err
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80 }
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81 if s != "LineString" {
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82 return errNoGeoJSONLineStringType
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83 }
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84 *t = GeoJSONLineStringType(s)
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85 return nil
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86 }