TaxCalculator class

税务计算器

提供税务计算的统一入口，支持含税/不含税金额的双向计算。

主要功能

• 统一的计算入口 calculate
• 自动选择计算策略
• 参数校验和异常处理

计算模式

1. 含税计算不含税：根据含税金额计算不含税金额和税额
2. 不含税计算含税：根据不含税金额计算含税金额和税额

使用示例

final operator = TaxOperator();
final sources = {
  TaxField.quantity: 10,
  TaxField.taxRate: 0.13,
  TaxField.taxIncludedUnitPrice: 113,
};

// 含税计算不含税
TaxCalculator.calculate(operator, sources);

// 不含税计算含税
TaxCalculator.calculate(operator, sources, isByTaxExcluded: true);

异常处理

• 当 sources 为空时抛出 ArgumentError
• 计算过程中的异常由具体策略类处理

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

calculate(TaxOperator operator, Map<TaxField, dynamic> sources, {bool isByTaxExcluded = false}) → void

执行税务计算