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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.ActivitiTaskAlreadyClaimedException;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.TaskEntity;


/**
 * @author Joram Barrez
 */
public class ClaimTaskCmd extends NeedsActiveTaskCmd {
  
  private static final long serialVersionUID = 1L;

  protected String userId;
  
  public ClaimTaskCmd(String taskId, String userId) {
    super(taskId);
    this.userId = userId;
  }
  
  protected Void execute(CommandContext commandContext, TaskEntity task) {

    if(userId != null) {
      if (task.getAssignee() != null) {
        if(!task.getAssignee().equals(userId)) {
          // When the task is already claimed by another user, throw exception. Otherwise, ignore
          // this, post-conditions of method already met.
          throw new ActivitiTaskAlreadyClaimedException(task.getId(), task.getAssignee());
        }
      } else {
        task.setAssignee(userId, true, true);
      }      
    } else {
      // Task should be assigned to no one
      task.setAssignee(null, true, true);
    }
    
    // Add claim time
    commandContext.getHistoryManager().recordTaskClaim( taskId);

    return null;
  }
  
  @Override
  protected String getSuspendedTaskException() {
    return "Cannot claim a suspended task";
  }

}