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kv.go
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kv.go
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// Copyright 2020 beego-dev
//
// 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 utils
type KV interface {
GetKey() interface{}
GetValue() interface{}
}
// SimpleKV is common structure to store key-value pairs.
// When you need something like Pair, you can use this
type SimpleKV struct {
Key interface{}
Value interface{}
}
var _ KV = new(SimpleKV)
func (s *SimpleKV) GetKey() interface{} {
return s.Key
}
func (s *SimpleKV) GetValue() interface{} {
return s.Value
}
// KVs interface
type KVs interface {
GetValueOr(key interface{}, defValue interface{}) interface{}
Contains(key interface{}) bool
IfContains(key interface{}, action func(value interface{})) KVs
}
// SimpleKVs will store SimpleKV collection as map
type SimpleKVs struct {
kvs map[interface{}]interface{}
}
var _ KVs = new(SimpleKVs)
// GetValueOr returns the value for a given key, if non-existant
// it returns defValue
func (kvs *SimpleKVs) GetValueOr(key interface{}, defValue interface{}) interface{} {
v, ok := kvs.kvs[key]
if ok {
return v
}
return defValue
}
// Contains checks if a key exists
func (kvs *SimpleKVs) Contains(key interface{}) bool {
_, ok := kvs.kvs[key]
return ok
}
// IfContains invokes the action on a key if it exists
func (kvs *SimpleKVs) IfContains(key interface{}, action func(value interface{})) KVs {
v, ok := kvs.kvs[key]
if ok {
action(v)
}
return kvs
}
// NewKVs creates the *KVs instance
func NewKVs(kvs ...KV) KVs {
res := &SimpleKVs{
kvs: make(map[interface{}]interface{}, len(kvs)),
}
for _, kv := range kvs {
res.kvs[kv.GetKey()] = kv.GetValue()
}
return res
}