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annotate pkg/models/cross.go @ 636:7a867e48b3c2

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Cross sections: Enforce minimal length of coordinates components and coordinates in input linestrings.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 13 Sep 2018 04:11:36 +0200
parents 6093016fac88
children 756f3fc62da6
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633
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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 GeoJSONLineCoordinates []GeoJSONCoordinate
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31 CrossSectionInput struct {
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32 Type GeoJSONFeature `json:"type"`
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33 Geometry GeoJSONLineString `json:"geometry"`
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34 Coordinates GeoJSONLineCoordinates `json:"coordinates"`
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35 Properties CrossSectionInputProperties `json:"properties"`
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36 }
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37 )
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38
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39 var (
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40 errNoGeoJSONFeature = errors.New("Not a valid GeoJSON feature")
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41 errNoGeoJSONLineStringType = errors.New("Not a valid GeoJSON linestring type")
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42 errTooLessComponents = errors.New("Too less components in coordinate")
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43 errTooLessCoordinates = errors.New("Too less coordinates")
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44 )
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45
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46 func (lc *GeoJSONLineCoordinates) UnmarshalJSON(data []byte) error {
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47 var coords []GeoJSONCoordinate
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48 if err := json.Unmarshal(data, &coords); err != nil {
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49 return err
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50 }
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51 if len(coords) < 2 {
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52 return errTooLessCoordinates
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53 }
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54 *lc = GeoJSONLineCoordinates(coords)
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55 return nil
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56 }
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57
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58 func (d *GeoJSONDate) UnmarshalJSON(data []byte) error {
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59 var s string
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60 if err := json.Unmarshal(data, &s); err != nil {
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61 return err
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62 }
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63 t, err := time.Parse("2006-01-02", s)
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64 if err != nil {
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65 return err
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66 }
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67 *d = GeoJSONDate{t}
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68 return nil
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69 }
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70
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71 func (c *GeoJSONCoordinate) UnmarshalJSON(data []byte) error {
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72 var pos []float64
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73 if err := json.Unmarshal(data, &pos); err != nil {
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74 return err
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75 }
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76 if len(pos) < 2 {
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77 return errTooLessComponents
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78 }
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79 *c = GeoJSONCoordinate{Lon: pos[0], Lat: pos[1]}
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80 return nil
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81 }
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82
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83 func (t *GeoJSONFeature) UnmarshalJSON(data []byte) error {
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84 var s string
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85 if err := json.Unmarshal(data, &s); err != nil {
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86 return err
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87 }
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88 if s != "Feature" {
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89 return errNoGeoJSONFeature
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90 }
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91 *t = GeoJSONFeature(s)
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92 return nil
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93 }
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94
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95 func (t *GeoJSONLineStringType) UnmarshalJSON(data []byte) error {
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96 var s string
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97 if err := json.Unmarshal(data, &s); err != nil {
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98 return err
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99 }
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100 if s != "LineString" {
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101 return errNoGeoJSONLineStringType
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102 }
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103 *t = GeoJSONLineStringType(s)
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104 return nil
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105 }