/**
    * Copyright 2005-2016 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.krad.demo.uif.controller;
  
  import org.kuali.rice.krad.file.FileMeta;
  import org.kuali.rice.krad.file.FileMetaBlob;
  import org.kuali.rice.krad.web.form.UifFormBase;
  import org.kuali.rice.krad.web.service.impl.FileControllerServiceImpl;
  import org.springframework.util.FileCopyUtils;
  
  import javax.servlet.http.HttpServletResponse;
  import java.io.InputStream;
  import java.util.List;
  
  /**
   * Demo controller service for sending back file contents.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class DemoFileControllerServiceImpl extends FileControllerServiceImpl {
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected void sendFileFromLineResponse(UifFormBase form, HttpServletResponse response, List<FileMeta> collection,
              FileMeta fileLine) {
          if (!(fileLine instanceof FileMetaBlob)) {
              return;
          }
  
          try {
              InputStream is = ((FileMetaBlob) fileLine).getBlob().getBinaryStream();
              response.setContentType(fileLine.getContentType());
              response.setHeader("Content-Disposition", "attachment; filename=" + fileLine.getName());
  
              // copy it to response's OutputStream
              FileCopyUtils.copy(is, response.getOutputStream());
  
              response.flushBuffer();
          } catch (Exception e) {
              throw new RuntimeException("Unable to get file contents", e);
          }
      }
  }