core-chain/ethdb/table.go

// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package ethdb

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) Close() {
	// Do nothing; don't close the underlying DB.
}