可以引入参数对象:
class ParameterObject {
public final SomeClass!(TemplateParam) foo;
public final string[][string] someAA;
public final uint[] dataToProcess;
public final SomeEnumType flag;
private ParameterObject(
SomeClass!(TemplateParam) foo,
string[][string] someAA,
uint[] dataToProcess,
SomeEnumType flag) {
this.foo = foo;
this.someAA = someAA;
this.dataToProcess = dataToProcess;
this.flag = flag;
}
private static class Builder {
public SomeClass!(TemplateParam) foo;
public string[][string] someAA;
public uint[] dataToProcess;
public SomeEnumType flag;
public Builder foo(SomeClass!(TemplateParam) foo) {
this.foo = foo;
return this;
}
public Builder someAA(string[][string] someAA) {
this.someAA = someAA;
return this;
}
public Builder dataToProcess(uint[] dataToProcess) {
this.dataToProcess = dataToProcess;
return this;
}
public Builder flag(SomeEnumType flag) {
this.flag = flag;
return this;
}
public ParameterObject build() {
if (null == foo) throw Exception("init foo!");
if (null == someAA) throw Exception("init someAA!");
if (null == dataToProcess) throw Exception("init dataToProcess!");
if (null == flag) throw Exception("init flag!");
return new ParameterObject(foo, someAA, dataToProcess, flag);
}
}
}
现在,您的电话将如下所示:
SomeClass[string] myValue =
someFunction(
new ParameterObject.Build().
foo(myFoo).
someAA(myAA).
dataToProcess(myData).
flag(false).
build()
);
在允许创建内联映射的语言中处理类似情况要容易得多:
someFunction(
Map.new(
foo => myFoo,
someAA => myAA,
dataToProcess => myData,
flag => false
)
限定符final
意味着只能从类的构造函数中设置字段。类前面的限定符 static
意味着该类不绑定到它的外部类,即不能访问/改变它的字段。