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3.3.2. Specify an Intrinsic Group

3.3.2. Specify an Intrinsic Group

Use an intrinsic group with the Grouping API if:

the key class definition can be altered, that is if it is not part of an unmodifiable library.
if the key class is not concerned with the determination of a key/value pair group.

Use the @Group annotation in the relevant method to specify an intrinsic group. The group must always be a String, as illustrated in the example:

Example 3.2. Specifying an Intrinsic Group Example

class User {
 
   ...
   String office;
   ...
 
   public int hashCode()) {
      // Defines the hash for the key, normally used to determine location
      ...
   }
 
   // Override the location by specifying a group, all keys in the same
   // group end up with the same owner
   @Group
   String getOffice() {
      return office;
   }
 
}

class User {
 
   ...
   String office;
   ...
 
   public int hashCode()) {
      // Defines the hash for the key, normally used to determine location
      ...
   }
 
   // Override the location by specifying a group, all keys in the same
   // group end up with the same owner
   @Group
   String getOffice() {
      return office;
   }
 
}

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