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arraydb.go
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arraydb.go
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/*
* Copyright 2020 ICON Foundation
*
* 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 containerdb
import (
"github.com/icon-project/goloop/common/log"
"github.com/icon-project/goloop/service/scoreresult"
)
type ArrayDB struct {
key KeyBuilder
size WritableValue
store StoreState
}
func NewArrayDB(source interface{}, key KeyBuilder) *ArrayDB {
store := ToStoreState(source)
return &ArrayDB{
key: key,
size: store.At(key.Build()),
store: store,
}
}
func (a *ArrayDB) Size() int {
return int(a.size.Int64())
}
func (a *ArrayDB) Get(i int) Value {
key := a.key.Append(i).Build()
return a.store.GetValue(key)
}
func (a *ArrayDB) Set(i int, v interface{}) error {
if i < 0 || i >= a.Size() {
return scoreresult.ErrInvalidContainerAccess
}
key := a.key.Append(i).Build()
return a.store.At(key).Set(v)
}
func (a *ArrayDB) Put(v interface{}) error {
idx := a.Size()
key := a.key.Append(idx).Build()
if err := a.store.At(key).Set(v); err != nil {
return err
}
return a.size.Set(idx + 1)
}
func (a *ArrayDB) Pop() Value {
idx := a.Size()
if idx == 0 {
return nil
}
key := a.key.Append(idx - 1).Build()
ov, err := a.store.At(key).Delete()
if err != nil {
log.Panicf("Fail to delete last element")
}
if idx > 1 {
if err := a.size.Set(idx - 1); err != nil {
log.Panicf("Fail to update size")
}
} else {
if _, err := a.size.Delete(); err != nil {
log.Panicf("Fail to delete size")
}
}
return ov
}