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