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/* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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 org.camunda.bpm.engine.impl.event;

import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureNotNull;

import java.util.Map;

import org.camunda.bpm.engine.impl.bpmn.behavior.EventSubProcessStartEventActivityBehavior;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.persistence.entity.EventSubscriptionEntity;
import org.camunda.bpm.engine.impl.pvm.process.ActivityImpl;
import org.camunda.bpm.engine.impl.pvm.runtime.PvmExecutionImpl;

/**
 * @author Daniel Meyer
 * @author Falko Menge
 */
public abstract class AbstractEventHandler implements EventHandler {

  public void handleIntermediateEvent(EventSubscriptionEntity eventSubscription, Object payload, CommandContext commandContext) {

    PvmExecutionImpl execution = eventSubscription.getExecution();
    ActivityImpl activity = eventSubscription.getActivity();

    ensureNotNull("Error while sending signal for event subscription '" + eventSubscription.getId() + "': "
      + "no activity associated with event subscription", "activity", activity);

    if (payload instanceof Map) {
      @SuppressWarnings("unchecked")
      Map processVariables = (Map) payload;
      execution.setVariables(processVariables);
    }

    if(activity.equals(execution.getActivity())) {
      execution.signal("signal", null);
    }
    else {
      // hack around the fact that the start event is refrenced by event subscriptions for event subprocesses
      // and not the subprocess itself
      if (activity.getActivityBehavior() instanceof EventSubProcessStartEventActivityBehavior) {
        activity = (ActivityImpl) activity.getFlowScope();
      }

      execution.executeEventHandlerActivity(activity);
    }
  }

  @Override
  public void handleEvent(EventSubscriptionEntity eventSubscription, Object payload, CommandContext commandContext) {
    handleIntermediateEvent(eventSubscription, payload, commandContext);
  }
}