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table.go
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table.go
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package lvldb
import (
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/iterator"
)
type table struct {
db Database
prefix string
}
// NewTable returns a Database object that prefixes all keys with a given string.
func NewTable(db Database, prefix string) Database {
return &table{
db: db,
prefix: prefix,
}
}
func (dt *table) Put(key []byte, value []byte) error {
return dt.db.Put(append([]byte(dt.prefix), key...), value)
}
func (dt *table) Has(key []byte) (bool, error) {
return dt.db.Has(append([]byte(dt.prefix), key...))
}
func (dt *table) Get(key []byte) ([]byte, error) {
return dt.db.Get(append([]byte(dt.prefix), key...))
}
func (dt *table) Delete(key []byte) error {
return dt.db.Delete(append([]byte(dt.prefix), key...))
}
func (dt *table) LDB() *leveldb.DB {
return dt.db.LDB()
}
func (dt *table) NewIterator() iterator.Iterator {
return dt.db.NewIteratorWithPrefix([]byte(dt.prefix))
}
func (dt *table) NewIteratorWithPrefix(prefix []byte) iterator.Iterator {
return dt.db.NewIteratorWithPrefix(append([]byte(dt.prefix), prefix...))
}
func (dt *table) DeleteWithPrefix(prefix []byte) {
dt.db.DeleteWithPrefix(append([]byte(dt.prefix), prefix...))
}
func (dt *table) Close() {
// Do nothing; don't close the underlying DB.
}
type tableBatch struct {
batch Batch
prefix string
}
// NewTableBatch returns a Batch object which prefixes all keys with a given string.
func NewTableBatch(db Database, prefix string) Batch {
return &tableBatch{db.NewBatch(), prefix}
}
func (dt *table) NewBatch() Batch {
return &tableBatch{dt.db.NewBatch(), dt.prefix}
}
func (tb *tableBatch) Put(key, value []byte) error {
return tb.batch.Put(append([]byte(tb.prefix), key...), value)
}
func (tb *tableBatch) Write() error {
return tb.batch.Write()
}
func (tb *tableBatch) ValueSize() int {
return tb.batch.ValueSize()
}
func (tb *tableBatch) Reset() {
tb.batch.Reset()
}