Move to Commons Base

[lgpl/argeo-commons.git] / base / runtime / org.argeo.eclipse.ui.rap / src / main / java / org / argeo / eclipse / ui / specific / DownloadServiceHandler.java

diff --git a/base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/DownloadServiceHandler.java b/base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/DownloadServiceHandler.java
new file mode 100644 (file)
index 0000000..a8e2c34
--- /dev/null
+++ b/base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/DownloadServiceHandler.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2007-2012 Mathieu Baudier
+ *
+ * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.argeo.eclipse.ui.specific;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletResponse;
+
+import org.argeo.ArgeoException;
+import org.eclipse.rwt.RWT;
+import org.eclipse.rwt.service.IServiceHandler;
+
+public class DownloadServiceHandler implements IServiceHandler {
+
+       private FileProvider provider;
+
+       public DownloadServiceHandler(FileProvider provider) {
+               this.provider = provider;
+       }
+
+       public void service() throws IOException, ServletException {
+               // Which file to download?
+               String fileName = RWT.getRequest().getParameter("filename");
+               String fileId = RWT.getRequest().getParameter("fileid");
+
+               // Get the file content
+               byte[] download = provider.getByteArrayFileFromId(fileId);
+
+               // Send the file in the response
+               HttpServletResponse response = RWT.getResponse();
+               response.setContentType("application/octet-stream");
+               response.setContentLength(download.length);
+               String contentDisposition = "attachment; filename=\"" + fileName + "\"";
+               response.setHeader("Content-Disposition", contentDisposition);
+
+               // Various header fields that can be set to solve some issues with some
+               // old browsers.
+               // Unused.
+               // String contentType = "application/force-download; name=\"" + fileName
+               // + "\"";
+               // response.setContentType(contentType);
+               // response.setHeader("Content-Transfer-Encoding", "binary");
+               // response.setHeader("Pragma", "no-cache");
+               // response.setHeader("Cache-Control", "no-cache, must-revalidate");
+               // response.setHeader("Expires", "0");
+               // response.setHeader("Connection", "Keep-Alive");
+               // response.setHeader("Keep-Alive", "timeout=5, max=86");
+               // response.setHeader("transfer-Encoding", "chunked");
+
+               try {
+                       response.getOutputStream().write(download);
+               } catch (IOException ioe) {
+                       throw new ArgeoException("Error while writing the file " + fileName
+                                       + " to the servlet response", ioe);
+               }
+       }
+}