content: /*
   * Copyright 2010-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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.ByteArrayInputStream;
  import java.io.InputStream;
  import java.io.Serializable;
  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.ByteArrayEntity;
  
  /**
  
   */
  public class GetAttachmentContentCmd implements Command<InputStream>, Serializable {
  
      private static final long serialVersionUID = 1L;
      protected String attachmentId;
  
      public GetAttachmentContentCmd(String attachmentId) {
          this.attachmentId = attachmentId;
      }
  
      public InputStream execute(CommandContext commandContext) {
          AttachmentEntity attachment = commandContext.getAttachmentEntityManager().findById(attachmentId);
  
          String contentId = attachment.getContentId();
          if (contentId == null) {
              return null;
          }
  
          ByteArrayEntity byteArray = commandContext.getByteArrayEntityManager().findById(contentId);
          byte[] bytes = byteArray.getBytes();
  
          return new ByteArrayInputStream(bytes);
      }
  }
  