OpenFile.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.eclipse.ui.specific;
  17
  18 import org.apache.commons.logging.Log;
  19 import org.apache.commons.logging.LogFactory;
  20 import org.eclipse.core.commands.AbstractHandler;
  21 import org.eclipse.core.commands.ExecutionEvent;
  22 import org.eclipse.core.commands.ExecutionException;
  23 import org.eclipse.rap.rwt.RWT;
  24 import org.eclipse.rap.rwt.client.service.UrlLauncher;
  25
  26 /**
  27  * Rap specific command handler to open a file retrieved from the server. It
  28  * forwards the request to the correct service after encoding file name and path
  29  * in the request URI.
  30  *
  31  * The parameter "URI" is used to determine the correct file service, the path
  32  * and the file name. An optional file name can be precised to present a
  33  * different file name as the one used to retrieve it to the end user/
  34  *
  35  * Various instances of this handler with different command ID might coexist in
  36  * order to provide context specific download service.
  37  *
  38  * The instance specific service is called by its ID and must have been
  39  * externally created
  40  */
  41 public class OpenFile extends AbstractHandler {
  42         private final static Log log = LogFactory.getLog(OpenFile.class);
  43
  44         /* DEPENDENCY INJECTION */
  45         private String openFileServiceId;
  46
  47         public final static String PARAM_FILE_NAME = OpenFileService.PARAM_FILE_NAME;
  48         public final static String PARAM_FILE_URI = OpenFileService.PARAM_FILE_URI; // "param.fileURI";
  49
  50         public Object execute(ExecutionEvent event) throws ExecutionException {
  51                 String fileName = event.getParameter(PARAM_FILE_NAME);
  52                 String fileUri = event.getParameter(PARAM_FILE_URI);
  53
  54                 // sanity check
  55                 if (fileUri == null || "".equals(fileUri.trim())
  56                                 || openFileServiceId == null
  57                                 || "".equals(openFileServiceId.trim()))
  58                         return null;
  59
  60                 StringBuilder url = new StringBuilder();
  61                 url.append(RWT.getServiceManager().getServiceHandlerUrl(
  62                                 openFileServiceId));
  63
  64                 url.append("&").append(PARAM_FILE_NAME).append("=");
  65                 url.append(fileName);
  66                 url.append("&").append(PARAM_FILE_URI).append("=");
  67                 url.append(fileUri);
  68
  69                 String downloadUrl = url.toString();
  70                 if (log.isTraceEnabled())
  71                         log.debug("URL : " + downloadUrl);
  72
  73                 UrlLauncher launcher = RWT.getClient().getService(UrlLauncher.class);
  74                 launcher.openURL(downloadUrl);
  75
  76                 // These lines are useless in the current use case but might be
  77                 // necessary with new browsers. Stored here for memo
  78                 // response.setContentType("application/force-download");
  79                 // response.setHeader("Content-Disposition", contentDisposition);
  80                 // response.setHeader("Content-Transfer-Encoding", "binary");
  81                 // response.setHeader("Pragma", "no-cache");
  82                 // response.setHeader("Cache-Control", "no-cache, must-revalidate");
  83                 return null;
  84         }
  85
  86         /* DEPENDENCY INJECTION */
  87         public void setOpenFileServiceId(String openFileServiceId) {
  88                 this.openFileServiceId = openFileServiceId;
  89         }
  90 }