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registry.go
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registry.go
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// Copyright 2018-2021 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package entity
import "fmt"
// Registry represents a simple id->entity map.
type Registry struct {
Entities map[string]Entity
}
// Register registers a new entity.
func (r *Registry) Register(entity Entity) {
r.Entities[entity.GetID()] = entity
}
// FindEntities returns all entities matching the provided IDs.
// If an entity with a certain ID doesn't exist and mustExist is true, an error is returned.
func (r *Registry) FindEntities(ids []string, mustExist bool, anyRequired bool) ([]Entity, error) {
var entities []Entity
for _, id := range ids {
if entity, ok := r.Entities[id]; ok {
entities = append(entities, entity)
} else if mustExist {
return nil, fmt.Errorf("no entity with ID '%v' registered", id)
}
}
if anyRequired && len(entities) == 0 { // At least one entity must be configured
return nil, fmt.Errorf("no entities available")
}
return entities, nil
}
// NewRegistry returns a new entity registry.
func NewRegistry() *Registry {
return &Registry{
Entities: make(map[string]Entity),
}
}