github.com/hasnat/dolt/go@v0.0.0-20210628190320-9eb5d843fbb7/libraries/doltcore/ref/ref_wrap.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 ref
    16  
    17  // MarshalableRef is a wrapper that provides the marshaling and unmarshaling of DoltRefs as strings within json.
    18  type MarshalableRef struct {
    19  	Ref DoltRef
    20  }
    21  
    22  // MarshalJSON marshal the ref as a string
    23  func (mr MarshalableRef) MarshalJSON() ([]byte, error) {
    24  	if mr.Ref == nil {
    25  		return []byte{}, nil
    26  	}
    27  
    28  	return MarshalJSON(mr.Ref)
    29  }
    30  
    31  // UnmarshalJSON unmarshals the ref from a string
    32  func (mr *MarshalableRef) UnmarshalJSON(data []byte) error {
    33  	if len(data) == 0 {
    34  		return nil
    35  	}
    36  
    37  	dref, err := Parse(string(data[1 : len(data)-1]))
    38  
    39  	if err != nil {
    40  		return err
    41  	}
    42  
    43  	mr.Ref = dref
    44  
    45  	return nil
    46  }