/**
 *
 * Copyright
 * 2009-2015 Jayway Products AB
 * 2016-2017 Föreningen Sambruk
 *
 * Licensed under AGPL, Version 3.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.gnu.org/licenses/agpl.txt
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package se.streamsource.streamflow.web.rest.resource;

import org.qi4j.api.injection.scope.Structure;
import org.qi4j.api.structure.Module;
import org.qi4j.api.value.ValueBuilder;

import se.streamsource.dci.restlet.server.CommandResult;
import se.streamsource.streamflow.infrastructure.event.domain.TransactionDomainEvents;
import se.streamsource.streamflow.infrastructure.event.domain.source.TransactionVisitor;

/**
 * This filter will record all the Events from the call, and if any occured and the
 * result entity is EmptyRepresentation, will return these events as the result.
 */
public class EventsCommandResult
      implements CommandResult, TransactionVisitor
{
   @Structure
   protected Module module;

   private ThreadLocal<TransactionDomainEvents> transactions = new ThreadLocal<TransactionDomainEvents>();

   public Object getResult()
   {
      TransactionDomainEvents transactionDomain = transactions.get();
      if (transactionDomain == null)
      {
         ValueBuilder<TransactionDomainEvents> builder = module.valueBuilderFactory().newValueBuilder(TransactionDomainEvents.class);
         builder.prototype().timestamp().set( System.currentTimeMillis() );
         transactionDomain = builder.newInstance();
      } else
      {
         transactions.set( null ); // Clear for next request
      }

      return transactionDomain;
   }


   public boolean visit( TransactionDomainEvents transactionDomain )
   {
      transactions.set( transactionDomain );

      return true;
   }
}