forked from TrueCloudLab/neoneo-go
69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
package storage
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import "github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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// Storage iterator options.
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const (
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FindDefault = 0
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FindKeysOnly = 1 << 0
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FindRemovePrefix = 1 << 1
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FindValuesOnly = 1 << 2
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FindDeserialize = 1 << 3
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FindPick0 = 1 << 4
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FindPick1 = 1 << 5
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FindAll = FindDefault | FindKeysOnly | FindRemovePrefix | FindValuesOnly |
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FindDeserialize | FindPick0 | FindPick1
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)
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type Iterator struct {
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m []stackitem.MapElement
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opts int64
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index int
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}
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func NewIterator(m *stackitem.Map, opts int64) *Iterator {
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return &Iterator{
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m: m.Value().([]stackitem.MapElement),
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opts: opts,
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index: -1,
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}
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}
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func (s *Iterator) Next() bool {
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if s.index < len(s.m) {
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s.index += 1
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}
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return s.index < len(s.m)
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}
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func (s *Iterator) Value() stackitem.Item {
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key := s.m[s.index].Key.Value().([]byte)
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if s.opts&FindRemovePrefix != 0 {
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key = key[1:]
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}
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if s.opts&FindKeysOnly != 0 {
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return stackitem.NewByteArray(key)
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}
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value := s.m[s.index].Value
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if s.opts&FindDeserialize != 0 {
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bs := s.m[s.index].Value.Value().([]byte)
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var err error
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value, err = stackitem.DeserializeItem(bs)
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if err != nil {
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panic(err)
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}
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}
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if s.opts&FindPick0 != 0 {
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value = value.Value().([]stackitem.Item)[0]
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} else if s.opts&FindPick1 != 0 {
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value = value.Value().([]stackitem.Item)[1]
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}
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if s.opts&FindValuesOnly != 0 {
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return value
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}
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return stackitem.NewStruct([]stackitem.Item{
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stackitem.NewByteArray(key),
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value,
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})
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}
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