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Money encoding/decoding
API for encoding/decoding a money value enables an application to store values in a database or send over a network.
A money value can be encoded to any type. For example it can be coded as a string in the format like 'USD 5.00'.
Note: this is a trivial example and you would simply use the parse/format methods to encode/decode from/to a string.
Encoding
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import 'package:money2/money2.dart';
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class MoneyToStringEncoder implements MoneyEncoder<String> {
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String encode(MoneyData data) {
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// Receives MoneyData DTO and produce
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// a string representation of money value...
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String major = data.getMajorUnits().toString();
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String mainor = data.getMinorUnits().toString();
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return data.currency.code + ' ' + major + '.' + minor;
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}
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}
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final encoded = fiveDollars.encodedBy(MoneyToStringEncoder());
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// Now we can save `encoded` to database...
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Decoding
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import 'package:money2/money2.dart';
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class StringToMoneyDecoder implements MoneyDecoder<String> {
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Currencies _currencies;
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StringToMoneyDecoder(this._currencies) {
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if (_currencies == null) {
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throw ArgumentError.notNull('currencies');
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}
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}
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/// Returns decoded `MoneyData` or throws a `FormatException`.
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MoneyData decode(String encoded) {
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// If `encoded` has an invalid format throws FormatException;
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// Extracts currency code from `encoded`:
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final currencyCode = ...;
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// Tries to find information about a currency:
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final currency = _currencies.find(currencyCode);
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if (currency == null) {
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throw FormatException('Unknown currency: $currencyCode.');
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}
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// Using `currency.precision`, extracts minorUnits from `encoded`:
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final minorUnits = ...;
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return MoneyData.from(minorUnits, currency);
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}
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}
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import 'money2.dart';
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try {
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final value = Money.decoding('USD 5.00', MyMoneyDecoder(myCurrencies));
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// ...
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} on FormatException {
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// ...
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}
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Last modified 6mo ago
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