github.com/hasnat/dolt/go@v0.0.0-20210628190320-9eb5d843fbb7/store/types/decimal.go (about)

     1  // Copyright 2020 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 types
    16  
    17  import (
    18  	"context"
    19  
    20  	"github.com/shopspring/decimal"
    21  
    22  	"github.com/dolthub/dolt/go/store/hash"
    23  )
    24  
    25  type Decimal decimal.Decimal
    26  
    27  func (v Decimal) Value(ctx context.Context) (Value, error) {
    28  	return v, nil
    29  }
    30  
    31  func (v Decimal) Equals(other Value) bool {
    32  	v2, ok := other.(Decimal)
    33  	if !ok {
    34  		return false
    35  	}
    36  
    37  	return decimal.Decimal(v).Equal(decimal.Decimal(v2))
    38  }
    39  
    40  func (v Decimal) Less(nbf *NomsBinFormat, other LesserValuable) (bool, error) {
    41  	if v2, ok := other.(Decimal); ok {
    42  		return decimal.Decimal(v).LessThan(decimal.Decimal(v2)), nil
    43  	}
    44  	return DecimalKind < other.Kind(), nil
    45  }
    46  
    47  func (v Decimal) Hash(nbf *NomsBinFormat) (hash.Hash, error) {
    48  	return getHash(v, nbf)
    49  }
    50  
    51  func (v Decimal) isPrimitive() bool {
    52  	return true
    53  }
    54  
    55  func (v Decimal) WalkValues(ctx context.Context, cb ValueCallback) error {
    56  	return nil
    57  }
    58  
    59  func (v Decimal) WalkRefs(nbf *NomsBinFormat, cb RefCallback) error {
    60  	return nil
    61  }
    62  
    63  func (v Decimal) typeOf() (*Type, error) {
    64  	return PrimitiveTypeMap[DecimalKind], nil
    65  }
    66  
    67  func (v Decimal) Kind() NomsKind {
    68  	return DecimalKind
    69  }
    70  
    71  func (v Decimal) valueReadWriter() ValueReadWriter {
    72  	return nil
    73  }
    74  
    75  func (v Decimal) writeTo(w nomsWriter, nbf *NomsBinFormat) error {
    76  	encodedDecimal, err := decimal.Decimal(v).GobEncode()
    77  	if err != nil {
    78  		return err
    79  	}
    80  
    81  	err = DecimalKind.writeTo(w, nbf)
    82  	if err != nil {
    83  		return err
    84  	}
    85  
    86  	w.writeUint16(uint16(len(encodedDecimal)))
    87  	w.writeRaw(encodedDecimal)
    88  	return nil
    89  }
    90  
    91  func (v Decimal) readFrom(nbf *NomsBinFormat, b *binaryNomsReader) (Value, error) {
    92  	dec, err := b.ReadDecimal()
    93  	if err != nil {
    94  		return nil, err
    95  	}
    96  	return Decimal(dec), nil
    97  }
    98  
    99  func (v Decimal) skip(nbf *NomsBinFormat, b *binaryNomsReader) {
   100  	size := uint32(b.readUint16())
   101  	b.skipBytes(size)
   102  }
   103  
   104  func (v Decimal) HumanReadableString() string {
   105  	return decimal.Decimal(v).String()
   106  }