方法和构造函数？两者都继承自 Member，都有 getExceptionTypes() 方法。在这种情况下如何避免代码重复？

Question

我的代码库中有这两种方法，我想以某种方式合并它们以避免代码重复：

protected IJavaType[] getExceptionTypes(Method method) {
    Class<?>[] declaredExceptions = method.getExceptionTypes();

    IJavaType[] exceptions = new IJavaType[declaredExceptions.length];

    for (int i = 0; i < declaredExceptions.length; i++) {
        exceptions[i] = getType(declaredExceptions[i]);
    }

    return exceptions;
}

protected IJavaType[] getExceptionTypes(Constructor<?> c) {
    Class<?>[] declaredExceptions = c.getExceptionTypes();

    IJavaType[] exceptions = new IJavaType[declaredExceptions.length];

    for (int i = 0; i < declaredExceptions.length; i++) {
        exceptions[i] = getType(declaredExceptions[i]);
    }

    return exceptions;
}

是否有任何方法可以排除代码重复（除了使用模板模式的子类化之外）？

Answer 1

简单来说怎么样：

private IJavaType[] getExceptionTypes(Class<?>[] declaredExceptions) {
    IJavaType[] exceptions = new IJavaType[declaredExceptions.length];

    for (int i = 0; i < declaredExceptions.length; i++) {
        exceptions[i] = getType(declaredExceptions[i]);
    }

    return exceptions;
}

protected IJavaType[] getExceptionTypes(Method method) {
    return getExceptionTypes(method.getExceptionTypes());
}

protected IJavaType[] getExceptionTypes(Constructor<?> c) {
    return getExceptionTypes(c.getExceptionTypes());
}

Answer 2

那么你可以相当容易地提取其中的大部分：

protected IJavaType[] getExceptionTypes(Method method) {
    return getExceptionTypesImpl(method.getExceptionTypes());
}

protected IJavaType[] getExceptionTypes(Constructor<?> c) {
    return getExceptionTypesImpl(c.getExceptionTypes());    
}

private void getExceptionTypesImpl(Class<?>[] declaredExceptions) {
    IJavaType[] exceptions = new IJavaType[declaredExceptions.length];

    for (int i = 0; i < declaredExceptions.length; i++) {
        exceptions[i] = getType(declaredExceptions[i]);
    }

    return exceptions;
}