inheritance examples

With JMapper you can apply inheritance to configurations and conversions. The purpose is to share the configurations/conversions that are common between more beans.

Configuration

When you have a complex hierarchy, where there are two or more level of inheritance, it is useful configure the common fields just one time.
Annotation example:

class Item {



   @JMap String id;

   @JMap String description;



   // getters and setters..



}



class Eggs extends Item {         class Detergents extends Item {



   @JMap Date expirationDate;        @JMap Integer cl;

 

   // getter and setter              // getter and setter    



}                                 }

XML example:

<jmapper>

   <class name="package.Item">

      <attribute name="id">

         <value name="id"/>

      </attribute>

      <attribute name ="description">

         <value name="description"/>

      </attribute>

   </class>

   <class name="package.Eggs">

      <attribute name ="expirationDate">

         <value name="expirationDate"/>

      </attribute>

   </class>

   <class name="package.Detergents">

      <attribute name ="cl">

         <value name="cl"/>

      </attribute>

   </class>

</jmapper>

Conversion

The same logic can be applied for the conversions definition.
Annotation example:

class Item {



   @JMap String id;

   @JMap String description;



   @JMapConversion(from="description")

   public String conversion(String description){

      return description + " information added";

   }

   // getters and setters..



}



class Eggs extends Item {         class Detergents extends Item {



   @JMap Date expirationDate;        @JMap Integer cl;

 

                                     @JMapConversion(from="cl")

                                     public String conversion(Integer cl){

                                        if(cl <=750) return "small package";

                                        if(cl >=1500) return "large package";

                                        return "normal package";

   }



   // getter and setter              // getter and setter    



}                                 }

XML example:

<jmapper>

   <class name="package.Item">

      <attribute name="id">

         <value name="id"/>

      </attribute>

      <attribute name ="description">

         <value name="description"/>

      </attribute>

      <conversion name="fromDescription" from="description">

         return ${source} + " information added";

      </conversion>

   </class>

   <class name="package.Eggs">

      <attribute name ="expirationDate">

         <value name="expirationDate"/>

      </attribute>

   </class>

   <class name="package.Detergents">

      <attribute name ="cl">

         <value name="cl"/>

      </attribute>

      <conversion name="fromCl" from="cl">

         if(${source}<=750) return "small package";

         if(${source}>=1500) return "large package";

         return "normal package";

      </conversion>

   </class>

</jmapper>