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// Copyright 2015 xeipuuv ( https://github.com/xeipuuv )
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// author xeipuuv
// author-github https://github.com/xeipuuv
// author-mail xeipuuv@gmail.com
//
// repository-name gojsonschema
// repository-desc An implementation of JSON Schema, based on IETF's draft v4 - Go language.
//
// description Defines resources pooling.
// Eases referencing and avoids downloading the same resource twice.
//
// created 26-02-2013
package gojsonschema
import (
"errors"
"github.com/xeipuuv/gojsonreference"
)
type schemaPoolDocument struct {
Document interface{}
}
type schemaPool struct {
schemaPoolDocuments map[string]*schemaPoolDocument
standaloneDocument interface{}
jsonLoaderFactory JSONLoaderFactory
}
func newSchemaPool(f JSONLoaderFactory) *schemaPool {
p := &schemaPool{}
p.schemaPoolDocuments = make(map[string]*schemaPoolDocument)
p.standaloneDocument = nil
p.jsonLoaderFactory = f
return p
}
func (p *schemaPool) SetStandaloneDocument(document interface{}) {
p.standaloneDocument = document
}
func (p *schemaPool) GetStandaloneDocument() (document interface{}) {
return p.standaloneDocument
}
func (p *schemaPool) GetDocument(reference gojsonreference.JsonReference) (*schemaPoolDocument, error) {
if internalLogEnabled {
internalLog("Get Document ( %s )", reference.String())
}
var err error
// It is not possible to load anything that is not canonical...
if !reference.IsCanonical() {
return nil, errors.New(formatErrorDescription(
Locale.ReferenceMustBeCanonical(),
ErrorDetails{"reference": reference},
))
}
refToUrl := reference
refToUrl.GetUrl().Fragment = ""
var spd *schemaPoolDocument
// Try to find the requested document in the pool
for k := range p.schemaPoolDocuments {
if k == refToUrl.String() {
spd = p.schemaPoolDocuments[k]
}
}
if spd != nil {
if internalLogEnabled {
internalLog(" From pool")
}
return spd, nil
}
jsonReferenceLoader := p.jsonLoaderFactory.New(reference.String())
document, err := jsonReferenceLoader.LoadJSON()
if err != nil {
return nil, err
}
spd = &schemaPoolDocument{Document: document}
// add the document to the pool for potential later use
p.schemaPoolDocuments[refToUrl.String()] = spd
return spd, nil
}
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