github.com/ledgerwatch/erigon-lib@v1.0.0/kv/bitmapdb/stream.go (about)

     1  /*
     2  Copyright 2021 Erigon contributors
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  	http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package bitmapdb
    18  
    19  import (
    20  	"github.com/RoaringBitmap/roaring/roaring64"
    21  )
    22  
    23  type BitmapStream struct {
    24  	bm *roaring64.Bitmap
    25  	it roaring64.IntPeekable64
    26  }
    27  
    28  func NewBitmapStream(bm *roaring64.Bitmap) *BitmapStream {
    29  	return &BitmapStream{bm: bm, it: bm.Iterator()}
    30  }
    31  func (it *BitmapStream) HasNext() bool                        { return it.it.HasNext() }
    32  func (it *BitmapStream) Close()                               { ReturnToPool64(it.bm) }
    33  func (it *BitmapStream) Next() (uint64, error)                { return it.it.Next(), nil }
    34  func (it *BitmapStream) ToBitmap() (*roaring64.Bitmap, error) { return it.bm, nil }