3.2. Registering a Transformer via Annotations

The key for each value must also be indexed, and the key instance must then be transformed in a String.

Red Hat JBoss Data Grid includes some default transformation routines for encoding common primitives, however to use a custom key you must provide an implementation of org.infinispan.query.Transformer.

The following example shows how to annotate your key type using org.infinispan.query.Transformer:

@Transformable(transformer = CustomTransformer.class)
public class CustomKey {
   ...
}
 
public class CustomTransformer implements Transformer {
   @Override
   public Object fromString(String s) {
      ...
      return new CustomKey(...);
   }
 
   @Override
   public String toString(Object customType) {
      CustomKey ck = (CustomKey) customType;
      return ...
   }
}

@Transformable(transformer = CustomTransformer.class)
public class CustomKey {
   ...
}
 
public class CustomTransformer implements Transformer {
   @Override
   public Object fromString(String s) {
      ...
      return new CustomKey(...);
   }
 
   @Override
   public String toString(Object customType) {
      CustomKey ck = (CustomKey) customType;
      return ...
   }
}

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The two methods must implement a biunique correspondence.

For example, for any object A the following must be true:

A.equals( transformer.fromString( transformer.toString( A ) )

A.equals( transformer.fromString( transformer.toString( A ) )

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This assumes that the transformer is the appropriate Transformer implementation for objects of type A.

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3.2. Registering a Transformer via Annotations

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