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kvcascade.go
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/
kvcascade.go
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package storage
type KVCascade []KVIterableReader
func (kvc KVCascade) Get(key []byte) []byte {
for _, kvs := range kvc {
value := kvs.Get(key)
if value != nil {
return value
}
}
return nil
}
func (kvc KVCascade) Has(key []byte) bool {
for _, kvs := range kvc {
has := kvs.Has(key)
if has {
return true
}
}
return false
}
func (kvc KVCascade) Iterator(low, high []byte) KVIterator {
iterators := make([]KVIterator, len(kvc))
for i, kvs := range kvc {
iterators[i] = kvs.Iterator(low, high)
}
return NewMultiIterator(false, iterators...)
}
func (kvc KVCascade) ReverseIterator(low, high []byte) KVIterator {
iterators := make([]KVIterator, len(kvc))
for i, kvs := range kvc {
iterators[i] = kvs.ReverseIterator(low, high)
}
return NewMultiIterator(true, iterators...)
}