1 files changed, 98 insertions, 0 deletions
diff --git a/vendor/github.com/go-openapi/spec/cache.go b/vendor/github.com/go-openapi/spec/cache.go
new file mode 100644
index 000000000..122993b44
--- /dev/null
+++ b/vendor/github.com/go-openapi/spec/cache.go
@@ -0,0 +1,98 @@
+// Copyright 2015 go-swagger maintainers
+//
+// 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.
+
+package spec
+
+import (
+	"sync"
+)
+
+// ResolutionCache a cache for resolving urls
+type ResolutionCache interface {
+	Get(string) (interface{}, bool)
+	Set(string, interface{})
+}
+
+type simpleCache struct {
+	lock  sync.RWMutex
+	store map[string]interface{}
+}
+
+func (s *simpleCache) ShallowClone() ResolutionCache {
+	store := make(map[string]interface{}, len(s.store))
+	s.lock.RLock()
+	for k, v := range s.store {
+		store[k] = v
+	}
+	s.lock.RUnlock()
+
+	return &simpleCache{
+		store: store,
+	}
+}
+
+// Get retrieves a cached URI
+func (s *simpleCache) Get(uri string) (interface{}, bool) {
+	s.lock.RLock()
+	v, ok := s.store[uri]
+
+	s.lock.RUnlock()
+	return v, ok
+}
+
+// Set caches a URI
+func (s *simpleCache) Set(uri string, data interface{}) {
+	s.lock.Lock()
+	s.store[uri] = data
+	s.lock.Unlock()
+}
+
+var (
+	// resCache is a package level cache for $ref resolution and expansion.
+	// It is initialized lazily by methods that have the need for it: no
+	// memory is allocated unless some expander methods are called.
+	//
+	// It is initialized with JSON schema and swagger schema,
+	// which do not mutate during normal operations.
+	//
+	// All subsequent utilizations of this cache are produced from a shallow
+	// clone of this initial version.
+	resCache  *simpleCache
+	onceCache sync.Once
+
+	_ ResolutionCache = &simpleCache{}
+)
+
+// initResolutionCache initializes the URI resolution cache. To be wrapped in a sync.Once.Do call.
+func initResolutionCache() {
+	resCache = defaultResolutionCache()
+}
+
+func defaultResolutionCache() *simpleCache {
+	return &simpleCache{store: map[string]interface{}{
+		"http://swagger.io/v2/schema.json":       MustLoadSwagger20Schema(),
+		"http://json-schema.org/draft-04/schema": MustLoadJSONSchemaDraft04(),
+	}}
+}
+
+func cacheOrDefault(cache ResolutionCache) ResolutionCache {
+	onceCache.Do(initResolutionCache)
+
+	if cache != nil {
+		return cache
+	}
+
+	// get a shallow clone of the base cache with swagger and json schema
+	return resCache.ShallowClone()
+}