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iterator.go
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/
iterator.go
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// Copyright (c) 2020 IoTeX Foundation
// This is an alpha (internal) release and is not suitable for production. This source code is provided 'as is' and no
// warranties are given as to title or non-infringement, merchantability or fitness for purpose and, to the extent
// permitted by law, all liability for your use of the code is disclaimed. This source code is governed by Apache
// License 2.0 that can be found in the LICENSE file.
package state
import (
"github.com/pkg/errors"
)
// ErrOutOfBoundary defines an error when the index in the iterator is out of boundary
var ErrOutOfBoundary = errors.New("index is out of boundary")
// Iterator defines an interator to read a set of states
type Iterator interface {
// Size returns the size of the iterator
Size() int
// Next deserializes the next state in the iterator
Next(interface{}) error
}
type iterator struct {
states [][]byte
index int
}
// NewIterator returns an interator given a list of serialized states
func NewIterator(states [][]byte) Iterator {
return &iterator{index: 0, states: states}
}
func (it *iterator) Size() int {
return len(it.states)
}
func (it *iterator) Next(s interface{}) error {
i := it.index
if i >= len(it.states) {
return ErrOutOfBoundary
}
it.index = i + 1
return Deserialize(s, it.states[i])
}