You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

46 lines
932 B

package db
import (
"bytes"
"strings"
)
func IteratePrefix(db DB, prefix []byte) Iterator {
var start, end []byte
if len(prefix) == 0 {
start = BeginningKey()
end = EndingKey()
} else {
start = cp(prefix)
end = cpIncr(prefix)
}
return db.Iterator(start, end)
}
//----------------------------------------
func cp(bz []byte) (ret []byte) {
ret = make([]byte, len(bz))
copy(ret, bz)
return ret
}
// CONTRACT: len(bz) > 0
func cpIncr(bz []byte) (ret []byte) {
ret = cp(bz)
for i := len(bz) - 1; i >= 0; i-- {
if ret[i] < byte(0xFF) {
ret[i] += 1
return
} else {
ret[i] = byte(0x00)
}
}
return EndingKey()
}
func IsKeyInDomain(key string, start, end []byte) bool {
leftCondition := bytes.Equal(start, BeginningKey()) || strings.Compare(key, string(start)) >= 0
rightCondition := bytes.Equal(end, EndingKey()) || strings.Compare(key, string(end)) < 0
return leftCondition && rightCondition
}