Mercurial > gemma
view pkg/models/isrs.go @ 5095:e21cbb9768a2
Prevent duplicate fairway areas
In principal, there can be only one or no fairway area at each point
on the map. Since polygons from real data will often be topologically
inexact, just disallow equal geometries. This will also help to
avoid importing duplicates with concurrent imports, once the history
of fairway dimensions will be preserved.
author | Tom Gottfried <tom@intevation.de> |
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date | Wed, 25 Mar 2020 18:10:02 +0100 |
parents | 15c9d4064f0f |
children | 1222b777f51f |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2018 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Raimund Renkert <raimund.renkert@intevation.de> // * Sascha L. Teichmann <sascha.teichmann@intevation.de> package models import ( "encoding/json" "errors" "fmt" "strconv" ) // Isrs represents the gauge identification data structure type Isrs struct { CountryCode string LoCode string FairwaySection string Orc string Hectometre int } func (isrs *Isrs) UnmarshalJSON(data []byte) error { var s string if err := json.Unmarshal(data, &s); err != nil { return err } in, err := IsrsFromString(s) if err != nil { return err } *isrs = *in return nil } func (isrs *Isrs) Less(other *Isrs) bool { if isrs.CountryCode < other.CountryCode { return true } if isrs.CountryCode > other.CountryCode { return false } if isrs.LoCode < other.LoCode { return true } if isrs.LoCode > other.LoCode { return false } if isrs.FairwaySection < other.FairwaySection { return true } if isrs.FairwaySection > other.FairwaySection { return false } if isrs.Orc < other.Orc { return true } if isrs.Orc > other.Orc { return false } if isrs.Hectometre < other.Hectometre { return true } return false } func (isrs *Isrs) MarshalJSON() ([]byte, error) { if isrs == nil { return nil, nil } return json.Marshal(isrs.String()) } // IsrsFromString converts string representation of isrs code to type Isrs func IsrsFromString(isrsCode string) (*Isrs, error) { if len(isrsCode) < 20 { return nil, errors.New("ISRS code too short") } hm, err := strconv.Atoi(isrsCode[15:20]) if err != nil { return nil, err } isrs := Isrs{ CountryCode: isrsCode[0:2], LoCode: isrsCode[2:5], FairwaySection: isrsCode[5:10], Orc: isrsCode[10:15], Hectometre: hm, } return &isrs, nil } // String creates a isrs code string from Isrs func (isrs *Isrs) String() string { return fmt.Sprintf("%s%s%s%s%05d", isrs.CountryCode, isrs.LoCode, isrs.FairwaySection, isrs.Orc, isrs.Hectometre) }