重写自引用对象上的compareTo（父/子关系）

发布于 2024-12-12 09:22:09 字数 539 浏览 0 评论 0原文

我正在尝试在 grails 中的域类上实现compareTo，以便我可以返回SortedSet。我希望我的排序集按父名称排序，然后按“子”名称排序。例如（P=父级，C=子级）：

P-1
- C-1
- C-2
P-2
- C-3
- C-4

我的类看起来像这样：

class Issue implements Comparable {
 String name
 Issue parent

@Override
public int compareTo(obj){
  if(obj.parent!=null && this.parent!=null){
   parent.name.compareTo(obj.parent.name)
  }else{
      //What do I compare to sort the children relative to their parents?
  }
}

原文

I'm trying to implement compareTo on a domain class in grails so I can return a SortedSet. I want my sorted set to be ordered by parent name, then by "child" name. For example (P=parent, C=child):

P-1
- C-1
- C-2
P-2
- C-3
- C-4

My class looks something like this:

class Issue implements Comparable {
 String name
 Issue parent

@Override
public int compareTo(obj){
  if(obj.parent!=null && this.parent!=null){
   parent.name.compareTo(obj.parent.name)
  }else{
      //What do I compare to sort the children relative to their parents?
  }
}

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老旧海报 2024-12-19 09:22:09

如果您要寻找的只是排序集，那么仅在问题上实现 Comparable 并在映射上使用排序顺序就足够了吗？

class Issue implements Comparable {
 String name
 Issue parent
 SortedSet children

 static hasMany = [children : Issue]
 static belongsTo = [parent : Issue]
 static mapping = {
    sort 'name'
    children sort:'name'
 }    

@Override
public int compareTo(obj){
  if(obj){
    this.name?.compareTo(obj.name)
  }
}

If all you're looking for is sorted sets, would just implementing Comparable on Issue and using sort orders on the mappings suffice?

class Issue implements Comparable {
 String name
 Issue parent
 SortedSet children

 static hasMany = [children : Issue]
 static belongsTo = [parent : Issue]
 static mapping = {
    sort 'name'
    children sort:'name'
 }    

@Override
public int compareTo(obj){
  if(obj){
    this.name?.compareTo(obj.name)
  }
}

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