base/runtime/org.argeo.eclipse.ui.rcp/src/main/java/org/argeo/eclipse/ui/specific/FileHandler.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 java.awt.Desktop;
  19 import java.io.File;
  20 import java.io.FileOutputStream;
  21 import java.io.IOException;
  22 import java.io.InputStream;
  23 import java.io.OutputStream;
  24
  25 import org.apache.commons.io.IOUtils;
  26 import org.argeo.ArgeoException;
  27
  28 /**
  29  * Abstraction that enable to implement runtime environment specific (typically
  30  * RCP or RAP) methods while dealing with files in the UI.
  31  *
  32  */
  33 public class FileHandler {
  34
  35         private FileProvider provider;
  36
  37         public FileHandler(FileProvider provider) {
  38                 this.provider = provider;
  39         }
  40
  41         public void openFile(String fileName, String fileId) {
  42                 String tmpFileName = fileName;
  43                 String prefix = "", extension = "";
  44                 if (fileName != null) {
  45                         int ind = fileName.lastIndexOf('.');
  46                         if (ind > 0) {
  47                                 prefix = fileName.substring(0, ind);
  48                                 extension = fileName.substring(ind);
  49                         }
  50                 }
  51
  52                 InputStream is = null;
  53                 try {
  54                         is = provider.getInputStreamFromFileId(fileId);
  55                         File file = createTmpFile(prefix, extension, is);
  56                         tmpFileName = file.getName();
  57                         Desktop desktop = null;
  58                         if (Desktop.isDesktopSupported()) {
  59                                 desktop = Desktop.getDesktop();
  60                         }
  61                         desktop.open(file);
  62                 } catch (IOException e) {
  63                         // Note : tmpFileName = fileName if the error has been thrown while
  64                         // creating the tmpFile.
  65                         throw new ArgeoException("Cannot open file " + tmpFileName, e);
  66                 } finally {
  67                         IOUtils.closeQuietly(is);
  68                 }
  69         }
  70
  71         private File createTmpFile(String prefix, String suffix, InputStream is) {
  72                 File tmpFile = null;
  73                 OutputStream os = null;
  74                 try {
  75                         tmpFile = File.createTempFile(prefix, suffix);
  76                         os = new FileOutputStream(tmpFile);
  77                         IOUtils.copy(is, os);
  78                 } catch (IOException e) {
  79                         throw new ArgeoException("Cannot open file " + prefix + "."
  80                                         + suffix, e);
  81                 } finally {
  82                         IOUtils.closeQuietly(os);
  83                 }
  84                 return tmpFile;
  85         }
  86 }