Mercurial > gemma

annotate pkg/imports/misc.go @ 3733:ec86a7155377 concave-hull

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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 24 Jun 2019 11:39:09 +0200
parents a996f2ca9fa5
children f464cbcdf2f2
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1 // SPDX-License-Identifier: AGPL-3.0-or-later
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2 // License-Filename: LICENSES/AGPL-3.0.txt
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3 //
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4 // Copyright (C) 2018 by via donau
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5 // – Österreichische Wasserstraßen-Gesellschaft mbH
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6 // Software engineering by Intevation GmbH
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7 //
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8 // Author(s):
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9 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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10
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11 package imports
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12
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13 import (
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14 "context"
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15 "database/sql"
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16 "fmt"
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17 "strings"
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18 )
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19
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20 type stringCounter map[string]int
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21
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22 func (sc stringCounter) String() string {
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23 var b strings.Builder
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24 for t, c := range sc {
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25 if b.Len() > 0 {
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26 b.WriteString(", ")
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27 }
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28 b.WriteString(fmt.Sprintf("%s: %d", t, c))
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29 }
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30 return b.String()
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31 }
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32
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33 func Savepoint(
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34 ctx context.Context,
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35 tx *sql.Tx,
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36 name string,
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37 ) func(func() error) error {
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38
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39 var (
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40 savepoint = "SAVEPOINT " + name
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41 rollback = "ROLLBACK TO SAVEPOINT " + name
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42 release = "RELEASE SAVEPOINT " + name
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43 )
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44
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45 return func(fn func() error) (err error) {
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46 if _, err = tx.ExecContext(ctx, savepoint); err != nil {
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47 return
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48 }
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49 var done bool
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50 defer func() {
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51 if !done {
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52 _, err2 := tx.ExecContext(ctx, rollback)
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53 if err == nil {
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54 err = err2
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55 }
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56 }
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57 }()
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58 err = fn()
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59
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60 if err == nil {
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61 done = true
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62 _, err = tx.ExecContext(ctx, release)
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63 }
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64 return
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65 }
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66 }