github.com/dolthub/dolt/go@v0.40.5-0.20240520175717-68db7794bea6/store/nbs/chunk_source_adapter.go (about)

     1  // Copyright 2019 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package nbs
    16  
    17  import (
    18  	"context"
    19  
    20  	"github.com/dolthub/dolt/go/store/hash"
    21  )
    22  
    23  type chunkSourceAdapter struct {
    24  	tableReader
    25  	h hash.Hash
    26  }
    27  
    28  func (csa chunkSourceAdapter) hash() hash.Hash {
    29  	return csa.h
    30  }
    31  
    32  func newReaderFromIndexData(ctx context.Context, q MemoryQuotaProvider, idxData []byte, name hash.Hash, tra tableReaderAt, blockSize uint64) (cs chunkSource, err error) {
    33  	index, err := parseTableIndexByCopy(ctx, idxData, q)
    34  	if err != nil {
    35  		return nil, err
    36  	}
    37  
    38  	tr, err := newTableReader(index, tra, blockSize)
    39  	if err != nil {
    40  		return nil, err
    41  	}
    42  	return &chunkSourceAdapter{tr, name}, nil
    43  }
    44  
    45  func (csa chunkSourceAdapter) close() error {
    46  	return csa.tableReader.close()
    47  }
    48  
    49  func (csa chunkSourceAdapter) clone() (chunkSource, error) {
    50  	tr, err := csa.tableReader.clone()
    51  	if err != nil {
    52  		return &chunkSourceAdapter{}, err
    53  	}
    54  	return &chunkSourceAdapter{tr, csa.h}, nil
    55  }