package uk.co.badgersinfoil.asxsd.components;

 import uk.co.badgersinfoil.asxsd.MappingFunction;

 import uk.co.badgersinfoil.metaas.dom.ASMethod;

 /**

  * A 'mapping function' interface implementation that actually contributes

  * no code toward the generated program (when applied to an expression, the

  * expression is unchanged).

  */

 public class IdentityMappingFunction implements MappingFunction {

         public static IdentityMappingFunction INSTANCE = new IdentityMappingFunction();

         private IdentityMappingFunction() {

                 // hide ctor

         }

         /**

          * Returns its argument unchanged.

          */

         public String appliedTo(String expr) {

                 return expr;

         }

         /**

          * Always returns null.

          */

         public ASMethod getImplementation() {

                 return null;

         }

         public void setImplementation(ASMethod impl) {

                 // no-op

         }

 }