org.argeo.slc.client.rap/src/org/argeo/slc/client/rap/OpenJcrFileService.java

   1 package org.argeo.slc.client.rap;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5
   6 import javax.jcr.Node;
   7 import javax.jcr.Property;
   8 import javax.jcr.RepositoryException;
   9 import javax.jcr.Session;
  10 import javax.jcr.nodetype.NodeType;
  11 import javax.servlet.ServletException;
  12 import javax.servlet.http.HttpServletResponse;
  13 import javax.servlet.http.HttpServletRequest;
  14
  15 import org.apache.commons.io.IOUtils;
  16 import org.argeo.jcr.JcrUtils;
  17 import org.argeo.slc.SlcException;
  18 import org.eclipse.rap.rwt.RWT;
  19 import org.eclipse.rap.rwt.service.IServiceHandler;
  20
  21 /**
  22  * Basic Default service handler that retrieves a file from a NT_FILE JCR node
  23  * and launch the download.
  24  */
  25 public class OpenJcrFileService implements IServiceHandler {
  26
  27         /* DEPENDENCY INJECTION */
  28         final private Node fileNode;
  29
  30         public OpenJcrFileService(Node fileNode) {
  31                 this.fileNode = fileNode;
  32         }
  33
  34         public void service(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
  35                 // Get the file content
  36                 byte[] download = getFileAsByteArray();
  37
  38                 // Send the file in the response
  39                 //HttpServletResponse response = RWT.getResponse();
  40                 response.setContentType("application/octet-stream");
  41                 response.setContentLength(download.length);
  42                 String contentDisposition = null;
  43                 try {
  44                         contentDisposition = "attachment; filename=\""
  45                                         + JcrUtils.lastPathElement(fileNode.getPath()) + "\"";
  46                 } catch (RepositoryException e) {
  47                         throw new SlcException("Error while getting file Path " + fileNode,
  48                                         e);
  49                 }
  50                 response.setHeader("Content-Disposition", contentDisposition);
  51
  52                 try {
  53                         response.getOutputStream().write(download);
  54                 } catch (IOException ioe) {
  55                         throw new SlcException("Error while writing the file " + fileNode
  56                                         + " to the servlet response", ioe);
  57                 }
  58         }
  59
  60         protected byte[] getFileAsByteArray() {
  61
  62                 Session businessSession = null;
  63                 try {
  64                         boolean isValid = true;
  65                         Node child = null;
  66                         if (!fileNode.isNodeType(NodeType.NT_FILE))
  67                                 isValid = false;
  68                         else {
  69                                 child = fileNode.getNode(Property.JCR_CONTENT);
  70                                 if (!(child.isNodeType(NodeType.NT_RESOURCE) || child
  71                                                 .hasProperty(Property.JCR_DATA)))
  72                                         isValid = false;
  73                         }
  74
  75                         if (!isValid)
  76                                 return null;
  77
  78                         byte[] ba = null;
  79                         InputStream fis = null;
  80                         try {
  81                                 fis = (InputStream) child.getProperty(Property.JCR_DATA)
  82                                                 .getBinary().getStream();
  83                                 ba = IOUtils.toByteArray(fis);
  84                         } catch (Exception e) {
  85                                 throw new SlcException("Stream error while opening file "
  86                                                 + fileNode, e);
  87                         } finally {
  88                                 IOUtils.closeQuietly(fis);
  89                         }
  90                         return ba;
  91
  92                 } catch (RepositoryException e) {
  93                         throw new SlcException("Unexpected error while "
  94                                         + "opening file node " + fileNode, e);
  95                 } finally {
  96                         JcrUtils.logoutQuietly(businessSession);
  97                 }
  98         }
  99 }