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collection_meta_data.go
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collection_meta_data.go
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///////////////////////////////////////////////////////////////////////////////
//
// The MIT License (MIT)
// Copyright (c) 2018 Jivan Amara
//
// 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.
//
///////////////////////////////////////////////////////////////////////////////
// go-wfs project collection_meta_data.go
package wfs3
import (
"fmt"
"hash/fnv"
"log"
"github.com/go-spatial/go-wfs/data_provider"
)
func CollectionsMetaData(p *data_provider.Provider, serveAddress string, checkOnly bool) (content *CollectionsInfo, contentId string, err error) {
// TODO: This calculation of contentId assumes an unchanging data set.
// When a changing data set is needed this will have to be updated, hopefully after data providers can tell us
// something about updates.
hasher := fnv.New64()
hasher.Write([]byte(fmt.Sprintf("%v", serveAddress)))
contentId = fmt.Sprintf("%x", hasher.Sum64())
if checkOnly {
return nil, contentId, nil
}
cNames, err := p.CollectionNames()
if err != nil {
// TODO: Log error
return nil, "", err
}
csInfo := CollectionsInfo{Links: []*Link{}, Collections: []*CollectionInfo{}}
for _, cn := range cNames {
cInfo, _, err := CollectionMetaData(cn, p, serveAddress, checkOnly)
if err != nil {
return nil, "", err
}
csInfo.Collections = append(csInfo.Collections, cInfo)
}
return &csInfo, contentId, nil
}
func CollectionMetaData(name string, p *data_provider.Provider, serveAddress string, checkOnly bool) (content *CollectionInfo, contentId string, err error) {
// TODO: This calculation of contentId assumes an unchanging data set.
// When a changing data set is needed this will have to be updated, hopefully after data providers can tell us
// something about updates.
hasher := fnv.New64()
hasher.Write([]byte(fmt.Sprintf("%v%v", serveAddress, name)))
contentId = fmt.Sprintf("%x", hasher.Sum64())
if checkOnly {
return nil, contentId, nil
}
cNames, err := p.CollectionNames()
if err != nil {
log.Printf("problem getting collection names: %v", err)
return nil, "", err
}
validName := false
for _, cName := range cNames {
if name == cName {
validName = true
break
}
}
if !validName {
return nil, "", fmt.Errorf("Invalid collection name: %v", name)
}
cInfo := CollectionInfo{Name: name, Title: name, Links: []*Link{}}
return &cInfo, contentId, nil
}