FileHandler.java

   1 package org.argeo.eclipse.ui.specific;
   2
   3 import java.net.URL;
   4
   5 import org.apache.commons.logging.Log;
   6 import org.apache.commons.logging.LogFactory;
   7 import org.eclipse.rwt.RWT;
   8 import org.eclipse.rwt.service.IServiceHandler;
   9 import org.eclipse.rwt.service.IServiceManager;
  10 import org.eclipse.ui.PlatformUI;
  11
  12 /**
  13  * RAP SPECIFIC handler to enable the opening of a download dialog box triggered
  14  * by whatever action in the UI
  15  *
  16  * Manages the registration of the effective DownloadServiceHandler at
  17  * instantiation time.
  18  *
  19  * Manages the process of forwarding the request to the handler at runtime to
  20  * open the dialog box
  21  *
  22  * @author bsinou
  23  *
  24  */
  25 public class FileHandler {
  26
  27         private final static Log log = LogFactory.getLog(FileHandler.class);
  28
  29         public FileHandler(FileProvider provider) {
  30                 // Instantiate and register the DownloadServicHandler.
  31                 IServiceManager manager = RWT.getServiceManager();
  32                 IServiceHandler handler = new DownloadServiceHandler(provider);
  33                 manager.registerServiceHandler("downloadServiceHandler", handler);
  34         }
  35
  36         public void openFile(String fileName, String fileId) {
  37
  38                 // See RAP FAQ:
  39                 // http://wiki.eclipse.org/RAP/FAQ#How_to_provide_download_link.3F
  40                 // And forum discussion :
  41                 // http://www.eclipse.org/forums/index.php?t=msg&th=205487&start=0&S=43d85dacc88b505402420592109c7240
  42
  43                 try {
  44                         if (log.isDebugEnabled())
  45                                 log.debug("URL : " + createFullDownloadUrl(fileName, fileId));
  46
  47                         URL url = new URL(createFullDownloadUrl(fileName, fileId));
  48                         PlatformUI.getWorkbench().getBrowserSupport()
  49                                         .createBrowser("DownloadDialog").openURL(url);
  50                 } catch (Exception e) {
  51                         e.printStackTrace();
  52                 }
  53
  54                 // These lines are useless in the current use case but might be
  55                 // necessary with new browsers. Stored here for memo
  56                 // response.setContentType("application/force-download");
  57                 // response.setHeader("Content-Disposition", contentDisposition);
  58                 // response.setHeader("Content-Transfer-Encoding", "binary");
  59                 // response.setHeader("Pragma", "no-cache");
  60                 // response.setHeader("Cache-Control", "no-cache, must-revalidate");
  61         }
  62
  63         private String createFullDownloadUrl(String fileName, String fileId) {
  64                 StringBuilder url = new StringBuilder();
  65                 url.append(RWT.getRequest().getRequestURL());
  66                 url.append(createParamUrl(fileName, fileId));
  67                 return url.toString();
  68         }
  69
  70         private String createParamUrl(String filename, String fileId) {
  71                 StringBuilder url = new StringBuilder();
  72                 url.append("?");
  73                 url.append(IServiceHandler.REQUEST_PARAM);
  74                 url.append("=downloadServiceHandler");
  75                 url.append("&filename=");
  76                 url.append(filename);
  77                 url.append("&fileid=");
  78                 url.append(fileId);
  79                 String encodedURL = RWT.getResponse().encodeURL(url.toString());
  80                 return encodedURL;
  81         }
  82 }