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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 java.io.Serializable;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.compatibility.Activiti5CompatibilityHandler;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.TaskEntity;
import org.activiti.engine.impl.util.Activiti5Util;
import org.activiti.engine.task.Task;

/**
 * @author Joram Barrez
 */
public class SaveTaskCmd implements Command, Serializable {

  private static final long serialVersionUID = 1L;

  protected TaskEntity task;

  public SaveTaskCmd(Task task) {
    this.task = (TaskEntity) task;
  }

  public Void execute(CommandContext commandContext) {
    if (task == null) {
      throw new ActivitiIllegalArgumentException("task is null");
    }
    
    if (task.getProcessDefinitionId() != null && Activiti5Util.isActiviti5ProcessDefinitionId(commandContext, task.getProcessDefinitionId())) {
      Activiti5CompatibilityHandler activiti5CompatibilityHandler = Activiti5Util.getActiviti5CompatibilityHandler(); 
      activiti5CompatibilityHandler.saveTask(task);
      return null;
    }

    if (task.getId() == null) {
      commandContext.getTaskEntityManager().insert(task, null);

      // Need to to be done here, we can't make it generic for standalone
      // tasks
      // and tasks from a process, as the order of setting properties is
      // completely different.
      if (Context.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {
        Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.TASK_CREATED, task));

        if (task.getAssignee() != null) {
          // The assignment event is normally fired when calling
          // setAssignee. However, this
          // doesn't work for standalone tasks as the commandcontext
          // is not available.
          Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.TASK_ASSIGNED, task));
        }
      }
    } else {
      commandContext.getTaskEntityManager().update(task);
    }

    return null;
  }

}