mirror of
https://github.com/cypherstack/stack_wallet.git
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80 lines
2.6 KiB
Dart
80 lines
2.6 KiB
Dart
import 'dart:convert';
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import 'package:decimal/decimal.dart';
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import 'package:equatable/equatable.dart';
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final _ten = BigInt.from(10);
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class Amount implements Equatable {
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Amount({
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required BigInt rawValue,
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required this.fractionDigits,
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}) : assert(fractionDigits >= 0),
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_value = rawValue;
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/// truncate double value to [fractionDigits] places
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Amount.fromDouble(double amount, {required this.fractionDigits})
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: assert(fractionDigits >= 0),
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_value =
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Decimal.parse(amount.toString()).shift(fractionDigits).toBigInt();
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/// truncate decimal value to [fractionDigits] places
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Amount.fromDecimal(Decimal amount, {required this.fractionDigits})
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: assert(fractionDigits >= 0),
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_value = amount.shift(fractionDigits).toBigInt();
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// ===========================================================================
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// ======= Instance properties ===============================================
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final int fractionDigits;
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final BigInt _value;
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// ===========================================================================
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// ======= Getters ===========================================================
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/// raw base value
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BigInt get raw => _value;
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/// actual decimal vale represented
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Decimal get decimal =>
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(Decimal.fromBigInt(_value) / _ten.pow(fractionDigits).toDecimal())
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.toDecimal(scaleOnInfinitePrecision: fractionDigits);
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/// convenience getter
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@Deprecated("provided for convenience only. Use fractionDigits instead.")
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int get decimals => fractionDigits;
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Map<String, dynamic> toMap() {
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// ===========================================================================
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// ======= Serialization =====================================================
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return {"raw": raw.toString(), "fractionDigits": fractionDigits};
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}
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String toJsonString() {
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return jsonEncode(toMap());
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}
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// ===========================================================================
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// ======= Deserialization ===================================================
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static Amount fromSerializedJsonString(String json) {
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final map = jsonDecode(json) as Map;
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return Amount(
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rawValue: BigInt.parse(map["raw"] as String),
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fractionDigits: map["fractionDigits"] as int,
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);
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}
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// ===========================================================================
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// ======= Overrides =========================================================
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@override
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String toString() => "Amount($raw, $fractionDigits)";
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@override
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List<Object?> get props => [fractionDigits, _value];
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@override
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bool? get stringify => false;
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}
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