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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.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.AttachmentEntity;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;

import java.io.Serializable;

/**


 */
public class DeleteAttachmentCmd implements Command, Serializable {

  private static final long serialVersionUID = 1L;
  protected String attachmentId;

  public DeleteAttachmentCmd(String attachmentId) {
    this.attachmentId = attachmentId;
  }

  public Object execute(CommandContext commandContext) {
    AttachmentEntity attachment = commandContext.getAttachmentEntityManager().findById(attachmentId); 

    String processInstanceId = attachment.getProcessInstanceId();
    String processDefinitionId = null;
    if (attachment.getProcessInstanceId() != null) {
      ExecutionEntity process = commandContext.getExecutionEntityManager().findById(processInstanceId);
      if (process != null) {
        processDefinitionId = process.getProcessDefinitionId();
      }
    }
    
    commandContext.getAttachmentEntityManager().delete(attachment, false);

    if (attachment.getContentId() != null) {
      commandContext.getByteArrayEntityManager().deleteByteArrayById(attachment.getContentId());
    }

    if (attachment.getTaskId() != null) {
      commandContext.getHistoryManager().createAttachmentComment(attachment.getTaskId(), attachment.getProcessInstanceId(), attachment.getName(), false);
    }

    if (commandContext.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {
      commandContext.getProcessEngineConfiguration().getEventDispatcher()
          .dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_DELETED, attachment, processInstanceId, processInstanceId, processDefinitionId));
    }
    return null;
  }

}
    

    

    

            

    

            



    
    






    
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