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cswrecord.go
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cswrecord.go
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///////////////////////////////////////////////////////////////////////////////
//
// The MIT License (MIT)
// Copyright (c) 2018 Tom Kralidis
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
package parsers
import (
"bytes"
"encoding/xml"
"fmt"
"strconv"
"strings"
"golang.org/x/net/html/charset"
"github.com/go-spatial/geocatalogo/metadata"
)
// CSWRecord provides a CSW 2.0.2 Record model
type CSWRecord struct {
Identifier string `xml:"http://purl.org/dc/elements/1.1/ identifier"`
Type string `xml:"http://purl.org/dc/elements/1.1/ type"`
Title string `xml:"http://purl.org/dc/elements/1.1/ title"`
Modified string `xml:"http://purl.org/dc/terms/ modified"`
Abstract string `xml:"http://purl.org/dc/terms/ abstract"`
Subject []string `xml:"http://purl.org/dc/elements/1.1/ subject"`
Format string `xml:"http://purl.org/dc/elements/1.1/ format"`
Creator string `xml:"http://purl.org/dc/elements/1.1/ creator"`
Language string `xml:"http://purl.org/dc/elements/1.1/ language"`
References []string `xml:"http://purl.org/dc/terms/ references"`
WGS84BoundingBox boundingBox `xml:"http://www.opengis.net/ows WGS84BoundingBox"`
BoundingBox boundingBox `xml:"http://www.opengis.net/ows BoundingBox"`
}
type boundingBox struct {
Crs string `xml:"crs,attr"`
Dimensions uint `xml:"dimensions,attr"`
LowerCorner string `xml:"http://www.opengis.net/ows LowerCorner"`
UpperCorner string `xml:"http://www.opengis.net/ows UpperCorner"`
}
func (e *boundingBox) Minx() (float64, error) {
s := strings.Split(e.LowerCorner, " ")
minx, err := strconv.ParseFloat(s[0], 64)
if err != nil {
return 0, err
}
return minx, nil
}
func (e *boundingBox) Miny() (float64, error) {
s := strings.Split(e.LowerCorner, " ")
miny, err := strconv.ParseFloat(s[1], 64)
if err != nil {
return 0, err
}
return miny, nil
}
func (e *boundingBox) Maxx() (float64, error) {
s := strings.Split(e.UpperCorner, " ")
maxx, err := strconv.ParseFloat(s[0], 64)
if err != nil {
return 0, err
}
return maxx, nil
}
func (e *boundingBox) Maxy() (float64, error) {
s := strings.Split(e.UpperCorner, " ")
maxy, err := strconv.ParseFloat(s[1], 64)
if err != nil {
return 0, err
}
return maxy, nil
}
// BBox generates a list of minx,miny,maxx,maxy
func (e *boundingBox) BBox() [][][2]float64 {
minx, _ := e.Minx()
miny, _ := e.Miny()
maxx, _ := e.Maxx()
maxy, _ := e.Maxy()
var a = [][][2]float64{{
{minx, miny},
{minx, maxy},
{maxx, maxy},
{maxx, miny},
{minx, miny},
}}
return a
}
// ParseCSWRecord parses CSWRecord
func ParseCSWRecord(xmlBuffer []byte) (metadata.Record, error) {
var cswRecord CSWRecord
var metadataRecord metadata.Record
reader := bytes.NewReader(xmlBuffer)
decoder := xml.NewDecoder(reader)
decoder.CharsetReader = charset.NewReaderLabel
err := decoder.Decode(&cswRecord)
if err != nil {
return metadataRecord, err
}
metadataRecord = metadata.Record{}
metadataRecord.Type = "Feature"
metadataRecord.Identifier = cswRecord.Identifier
metadataRecord.Properties.Type = cswRecord.Type
metadataRecord.Properties.Title = cswRecord.Title
metadataRecord.Properties.Abstract = cswRecord.Abstract
metadataRecord.Geometry.Type = "Polygon"
fmt.Println(cswRecord)
for _, ref := range cswRecord.References {
metadataRecord.Links = append(metadataRecord.Links, metadata.Link{URL: ref})
}
if (cswRecord.WGS84BoundingBox != boundingBox{}) {
metadataRecord.Geometry.Coordinates = cswRecord.WGS84BoundingBox.BBox()
} else if (cswRecord.BoundingBox != boundingBox{}) {
metadataRecord.Geometry.Coordinates = cswRecord.BoundingBox.BBox()
}
metadataRecord.BoundingBox = metadataRecord.Geometry.Bounds()
metadataRecord.Properties.Geocatalogo.Schema = "http://www.opengis.net/cat/csw/2.0.2"
metadataRecord.Properties.Geocatalogo.Typename = "csw:Record"
metadataRecord.Properties.Geocatalogo.Source = "local"
return metadataRecord, nil
}