package org.kuali.rice.core.cxf.interceptors;

 import org.apache.cxf.interceptor.Fault;

 import org.apache.cxf.message.Message;

 import org.apache.cxf.phase.AbstractPhaseInterceptor;

 import org.apache.cxf.phase.Phase;

 import org.kuali.rice.core.api.util.CollectionUtils;

 import java.lang.reflect.Field;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.List;

 import java.util.Map;

 import java.util.Set;

 /**

  * A CXF Interceptor that binds itself to the USER_LOGICAL phase to be used on inbound

  * messages.  This interceptor is invoked in the interceptor chain after unmarshalling

  * from XML to Java has occurred.  The role of this interceptor is to ensure that any

  * Collection (and specifically List, Set, or Map) used in a @WebMethod is ultimately of the

  * expected immutable type returned from the local service.

  */

 @SuppressWarnings("unused")

 public class ImmutableCollectionsInInterceptor extends AbstractPhaseInterceptor<Message> {

     /**

      * Instantiates an ImmutableCollectionsInInterceptor and adds it to the USER_LOGICAL phase.

      */

     public ImmutableCollectionsInInterceptor() {

         super(Phase.USER_LOGICAL);

     }

     @Override

     public void handleMessage(final Message message) throws Fault {

         try {

             List contents = message.getContent(List.class);

             for (Object o : contents) {

                 CollectionUtils.makeUnmodifiableAndNullSafe(o);

             }

         } catch (IllegalAccessException e) {

             throw new Fault(e);

         }

     }

 }