content: package org.openstack4j.openstack.telemetry.internal;
  
  import org.openstack4j.api.telemetry.EventService;
  import org.openstack4j.model.telemetry.Event;
  import org.openstack4j.model.telemetry.EventCriteria;
  import org.openstack4j.model.telemetry.Trait;
  import org.openstack4j.model.telemetry.TraitDescription;
  import org.openstack4j.openstack.telemetry.domain.CeilometerEvent;
  import org.openstack4j.openstack.telemetry.domain.CeilometerTrait;
  import org.openstack4j.openstack.telemetry.domain.CeilometerTraitDescription;
  
  import java.util.List;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  /**
   * OpenStack (Ceilometer) Event based Operations
   *
   * @author Miroslav Lacina
   */
  public class EventServiceImpl extends BaseTelemetryServices implements EventService {
  
      private static final String FIELD = "q.field";
      private static final String OPER = "q.op";
      private static final String VALUE = "q.value";
      private static final String LIMIT = "limit";
  
      /**
       * {@inheritDoc}
       */
      @Override
      public List<? extends Event> list(EventCriteria eventCriteria) {
          Invocation<CeilometerEvent[]> invocation = get(CeilometerEvent[].class, uri("/events"));
          if (eventCriteria != null && !eventCriteria.getCriteriaParams().isEmpty()) {
              for (EventCriteria.NameOpValue c : eventCriteria.getCriteriaParams()) {
                  invocation.param(FIELD, c.getField());
                  invocation.param(OPER, c.getOperator().getQueryValue());
                  invocation.param(VALUE, c.getValue());
              }
          }
  
          CeilometerEvent[] events = invocation.execute();
          return wrapList(events);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public List<? extends Event> list(EventCriteria eventCriteria, int limit) {
          Invocation<CeilometerEvent[]> invocation = get(CeilometerEvent[].class, uri("/events"));
          if (eventCriteria != null && !eventCriteria.getCriteriaParams().isEmpty()) {
              for (EventCriteria.NameOpValue c : eventCriteria.getCriteriaParams()) {
                  invocation.param(FIELD, c.getField());
                  invocation.param(OPER, c.getOperator().getQueryValue());
                  invocation.param(VALUE, c.getValue());
              }
          }
          invocation.param(LIMIT, limit);
  
          CeilometerEvent[] events = invocation.execute();
          return wrapList(events);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public Event get(String messageId) {
          checkNotNull(messageId);
          return get(CeilometerEvent.class, uri("/events/%s", messageId)).execute();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public List<String> listEventTypes() {
          String[] eventTypes = get(String[].class, uri("/event_types")).execute();
          return wrapList(eventTypes);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public List<? extends TraitDescription> listTraitDescriptions(String eventType) {
          checkNotNull(eventType);
          CeilometerTraitDescription[] traitDescriptions = get(CeilometerTraitDescription[].class, uri("/event_types/%s/traits", eventType)).execute();
          return wrapList(traitDescriptions);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public List<? extends Trait> listTraits(String eventType, String traitName) {
          checkNotNull(eventType);
          checkNotNull(traitName);
          CeilometerTrait[] traits = get(CeilometerTrait[].class, uri("/event_types/%s/traits/%s", eventType, traitName)).execute();
          return wrapList(traits);
      }
  
  }
  