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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.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;


/**
 * @author Tom Baeyens
 * @author Joram Barrez
 */
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
      .getDbSqlSession()
      .selectById(AttachmentEntity.class, attachmentId);

    commandContext
      .getDbSqlSession()
      .delete(attachment);
    
    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()) {
    	// Forced to fetch the process-instance to associate the right process definition
    	String processDefinitionId = null;
    	String processInstanceId = attachment.getProcessInstanceId();
    	if(attachment.getProcessInstanceId() != null) {
    		ExecutionEntity process = commandContext.getExecutionEntityManager().findExecutionById(processInstanceId);
    		if(process != null) {
    			processDefinitionId = process.getProcessDefinitionId();
    		}
    	}
    	commandContext.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(
    			ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_DELETED, attachment, processInstanceId, processInstanceId, processDefinitionId));
    }
    return null;
  }

}
    

    

    

                
 
            

    

                
 
            



    
    






    
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