github.com/joincivil/go-ethereum@v1.8.23/ethdb/table.go (about)

     1  // Copyright 2014 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package ethdb
    18  
    19  type table struct {
    20  	db     Database
    21  	prefix string
    22  }
    23  
    24  // NewTable returns a Database object that prefixes all keys with a given
    25  // string.
    26  func NewTable(db Database, prefix string) Database {
    27  	return &table{
    28  		db:     db,
    29  		prefix: prefix,
    30  	}
    31  }
    32  
    33  func (dt *table) Put(key []byte, value []byte) error {
    34  	return dt.db.Put(append([]byte(dt.prefix), key...), value)
    35  }
    36  
    37  func (dt *table) Has(key []byte) (bool, error) {
    38  	return dt.db.Has(append([]byte(dt.prefix), key...))
    39  }
    40  
    41  func (dt *table) Get(key []byte) ([]byte, error) {
    42  	return dt.db.Get(append([]byte(dt.prefix), key...))
    43  }
    44  
    45  func (dt *table) Delete(key []byte) error {
    46  	return dt.db.Delete(append([]byte(dt.prefix), key...))
    47  }
    48  
    49  func (dt *table) Close() {
    50  	// Do nothing; don't close the underlying DB.
    51  }