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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.impl.cmd;

import java.io.Serializable;

import org.camunda.bpm.engine.history.UserOperationLogEntry;
import org.camunda.bpm.engine.impl.interceptor.Command;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.persistence.entity.AttachmentEntity;
import org.camunda.bpm.engine.impl.persistence.entity.PropertyChange;
import org.camunda.bpm.engine.impl.persistence.entity.TaskEntity;


/**
 * @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
      .getDbEntityManager()
      .selectById(AttachmentEntity.class, attachmentId);

    commandContext
      .getDbEntityManager()
      .delete(attachment);

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

    if (attachment.getTaskId()!=null) {
      TaskEntity task = commandContext
          .getTaskManager()
          .findTaskById(attachment.getTaskId());

      PropertyChange propertyChange = new PropertyChange("name", null, attachment.getName());

      commandContext.getOperationLogManager()
          .logAttachmentOperation(UserOperationLogEntry.OPERATION_TYPE_DELETE_ATTACHMENT, task, propertyChange);

      task.triggerUpdateEvent();
    }

    return null;
  }

}