声纳错误条件不应无条件地评估为“真".或“错误"；

问题描述

我收到声纳违规:

条件不应无条件地评估为TRUE"或FALSE""

下面的代码.

列表<媒体内容>savedList = source.getChildMediaContents();列出<媒体内容>供应商列表 = target.getChildMediaContents();//如果存在和传入都是空的如果(保存列表 == 空 && 供应商列表 == 空){返回假；}//如果一个为空，另一个不为空，则需要更新if(savedList == null && 供应商列表!= null){返回真；}if(savedList != null && supplierList == null){返回真；}

在两个 if 块下面会报错

//如果一个为空，另一个不为空，则需要更新if(savedList == null && 供应商列表!= null){返回真；}if(savedList != null && supplierList == null){返回真；}

if(savedList == null && supplierList == null){返回假；}if(savedList == null && 供应商列表!= null){

条件 supplierList != null 在达到时始终为真.由于 Java 中 && 运算符的短路行为，在 supplierList != null 到达之前，savedList == null 必须首先为真.

但如果 savedList == null 为真，那么我们从前面的条件知道supplierList不是null，所以这是一个没有意义的条件.

另一方面，如果 savedList == null 为假，然后由于短路行为，supplierList != null 将不会被评估.

因此，无论 savedList == null 的结果如何，supplierList != null 永远不会被评估，所以你可以简单地删除那个条件.

if (savedList == null) {返回真；}

下一步:

if(savedList != null && supplierList == null){

感谢之前的简化，现在很明显 savedList 不能为 null.所以我们也可以去掉那个条件:

if (supplierList == null) {返回真；}

简而言之，这相当于你发布的代码:

if (savedList == null && supplierList == null) {返回假；}if (savedList == null || 供应商列表 == null) {返回真；}

I am getting sonar violation:

"Conditions should not unconditionally evaluate to "TRUE" or to "FALSE""

for the code below.

List<MediaContent> savedList = source.getChildMediaContents();
List<MediaContent> supplierList = target.getChildMediaContents();

// if existing and incoming both empty
if(savedList == null && supplierList == null){
    return false;
}

// if one is null and other is not then update is required
if(savedList == null && supplierList != null){
    return true;
}

if(savedList != null && supplierList == null){
    return true;
}

Below the two if blocks it is giving an error

// if one is null and other is not then update is required
if(savedList == null && supplierList != null){
    return true;
}

if(savedList != null && supplierList == null){
    return true;
}

if(savedList == null && supplierList == null){
    return false;
}

if(savedList == null && supplierList != null){

The condition supplierList != null is always true when reached. Due to the short-circuiting behavior of the && operator in Java, before supplierList != null is reached, savedList == null must be true first.

But if savedList == null is true, then we know from the previous condition that supplierList is not null, so it's a pointless condition.

On the other hand, if savedList == null is false, then the due to the short-circuiting behavior, the supplierList != null will not be evaluated.

Thus, regardless of the outcome of savedList == null, supplierList != null will never be evaluated, so you can simply remove that condition.

if (savedList == null) {
    return true;
}

Next:

if(savedList != null && supplierList == null){

Thanks to the simplification earlier, now it's clear that savedList cannot be null. So we can remove that condition too:

if (supplierList == null) {
    return true;
}

In short, this is equivalent to your posted code:

if (savedList == null && supplierList == null) {
    return false;
}

if (savedList == null || supplierList == null) {
    return true;
}

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