github.com/sixexorg/magnetic-ring@v0.0.0-20191119090307-31705a21e419/store/db/iterator.go (about)

     1  /*
     2   * Copyright (C) 2018 The ontology Authors
     3   * This file is part of The ontology library.
     4   *
     5   * The ontology is free software: you can redistribute it and/or modify
     6   * it under the terms of the GNU Lesser General Public License as published by
     7   * the Free Software Foundation, either version 3 of the License, or
     8   * (at your option) any later version.
     9   *
    10   * The ontology is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU Lesser General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU Lesser General Public License
    16   * along with The ontology.  If not, see <http://www.gnu.org/licenses/>.
    17   */
    18  
    19  package db
    20  
    21  import (
    22  	"github.com/syndtr/goleveldb/leveldb/iterator"
    23  )
    24  
    25  //Iterator of leveldb. Warp struct of leveldb iterator
    26  type Iterator struct {
    27  	iter iterator.Iterator
    28  }
    29  
    30  func (it *Iterator) Next() bool {
    31  	return it.iter.Next()
    32  }
    33  
    34  func (it *Iterator) Prev() bool {
    35  	return it.iter.Prev()
    36  }
    37  
    38  func (it *Iterator) First() bool {
    39  	return it.iter.First()
    40  }
    41  
    42  func (it *Iterator) Last() bool {
    43  	return it.iter.Last()
    44  }
    45  
    46  func (it *Iterator) Seek(key []byte) bool {
    47  	return it.iter.Seek(key)
    48  }
    49  
    50  func (it *Iterator) Key() []byte {
    51  	return it.iter.Key()
    52  }
    53  
    54  func (it *Iterator) Value() []byte {
    55  	return it.iter.Value()
    56  }
    57  
    58  func (it *Iterator) Release() {
    59  	it.iter.Release()
    60  }
    61  func (it *Iterator) Error() error {
    62  	return it.iter.Error()
    63  }