3.3.3. Specify an Extrinsic Group

Specify an extrinsic group for the Grouping API if:

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

An extrinsic group is specified using an implementation of the Grouper interface. This interface uses the computeGroup method to return the group.

In the process of specifying an extrinsic group, the Grouper interface acts as an interceptor by passing the computed value to computeGroup. If the @Group annotation is used, the group using it is passed to the first Grouper. As a result, using an intrinsic group provides even greater control.

Example 3.3. Specifying an Extrinsic Group Example

The following is an example that consists of a simple Grouper that uses the key class to extract the group from a key using a pattern. Any group information specified on the key class is ignored in such a situation.

public class KXGrouper implements Grouper<String> {
 
   // A pattern that can extract from a "kX" (e.g. k1, k2) style key
   // The pattern requires a String key, of length 2, where the first character is
   // "k" and the second character is a digit. We take that digit, and perform
   // modular arithmetic on it to assign it to group "1" or group "2".

   private static Pattern kPattern = Pattern.compile("(^k)(\\d)$");
 
    public String computeGroup(String key, String group) {
        Matcher matcher = kPattern.matcher(key);
        if (matcher.matches()) {
            String g = Integer.parseInt(matcher.group(2)) % 2 + "";
            return g;
        } else
            return null;
    }
 
    public Class<String> getKeyType() {
        return String.class;
    }
 
}

public class KXGrouper implements Grouper<String> {
 
   // A pattern that can extract from a "kX" (e.g. k1, k2) style key
   // The pattern requires a String key, of length 2, where the first character is
   // "k" and the second character is a digit. We take that digit, and perform
   // modular arithmetic on it to assign it to group "1" or group "2".

   private static Pattern kPattern = Pattern.compile("(^k)(\\d)$");
 
    public String computeGroup(String key, String group) {
        Matcher matcher = kPattern.matcher(key);
        if (matcher.matches()) {
            String g = Integer.parseInt(matcher.group(2)) % 2 + "";
            return g;
        } else
            return null;
    }
 
    public Class<String> getKeyType() {
        return String.class;
    }
 
}

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3.3.3. Specify an Extrinsic Group

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