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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.activiti.engine.impl.cmd;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.delegate.event.ActivitiEvent;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;

/**
 * Command that dispatches an event.
 * 

 */
public class DispatchEventCommand implements Command {

  protected ActivitiEvent event;

  public DispatchEventCommand(ActivitiEvent event) {
    this.event = event;
  }

  @Override
  public Void execute(CommandContext commandContext) {
    if (event == null) {
      throw new ActivitiIllegalArgumentException("event is null");
    }

    if (commandContext.getEventDispatcher().isEnabled()) {
      commandContext.getEventDispatcher().dispatchEvent(event);
    } else {
      throw new ActivitiException("Message dispatcher is disabled, cannot dispatch event");
    }

    return null;
  }

}