Mercurial > gemma

annotate pkg/wfs/rawfeaturecollection.go @ 5520:05db984d3db1

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Improve performance of bottleneck area calculation Avoid buffer calculations by replacing them with simple distance comparisons and calculate the boundary of the result geometry only once per iteration. In some edge cases with very large numbers of iterations, this reduced the runtime of a bottleneck import by a factor of more than twenty.
author Tom Gottfried <tom@intevation.de>
date Thu, 21 Oct 2021 19:50:39 +0200
parents 6caf5cd6249e
children
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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 wfs
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15
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16 import (
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17 "encoding/json"
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18 "io"
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19 )
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20
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21 // RawFeatureCollection is a template for a feature collection
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22 // returned by a WFS server.
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23 type RawFeatureCollection struct {
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24 CRS *struct {
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25 Properties struct {
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26 Name string `json:"name"`
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27 } `json:"properties"`
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28 } `json:"crs"`
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29 Features []*struct {
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30 Geometry struct {
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31 Coordinates *json.RawMessage `json:"coordinates"`
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32 Type string `json:"type"`
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33 } `json:"geometry"`
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34 Properties *json.RawMessage `json:"properties"`
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35 } `json:"features"`
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36 }
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37
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38 // ParseRawFeatureCollection turns a io.Reader into raw feature collection.
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39 func ParseRawFeatureCollection(r io.Reader) (*RawFeatureCollection, error) {
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40 rfc := new(RawFeatureCollection)
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41 if err := json.NewDecoder(r).Decode(rfc); err != nil {
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42 return nil, err
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43 }
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44 return rfc, nil
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45 }