SPARK-1208: Change the default file transfer save path

git-svn-id: http://svn.igniterealtime.org/svn/repos/spark/trunk@12054 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/sparkimpl/settings/local/WinRegistryReader.java

@@ -0,0 +1,92 @@
+/**
+ * $RCSfile: ,v $
+ * $Revision: $
+ * $Date: $
+ * 
+ * Copyright (C) 2004-2010 Jive Software. All rights reserved.
+ *
+ * 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.jivesoftware.sparkimpl.settings.local;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.StringWriter;
+
+/**
+ * Class that helps getting the My Documents Folder on Windows via the registry
+ * 
+ * @author wolf.posdorfer
+ * 
+ */
+public class WinRegistryReader {
+
+    private static final String REGQUERY_UTIL = "reg query ";
+    private static final String REGSTR_TOKEN = "REG_SZ";
+    private static final String REGDWORD_TOKEN = "REG_DWORD";
+
+    private static final String PERSONAL_FOLDER_CMD = REGQUERY_UTIL
+            + "\"HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\"
+            + "Explorer\\Shell Folders\" /v Personal";
+
+    /**
+     * returns the Path to the "My Documents" folder or <code>null</code>
+     * 
+     * @return {@link String}
+     */
+    public static String getMyDocumentsFromWinRegistry() {
+        try {
+            Process process = Runtime.getRuntime().exec(PERSONAL_FOLDER_CMD);
+            StreamReader streamreader = new StreamReader(process.getInputStream());
+
+            streamreader.start();
+            process.waitFor();
+            streamreader.join();
+
+            String result = streamreader.getResult();
+            int p = result.indexOf(REGSTR_TOKEN);
+
+            if (p == -1)
+                return null;
+
+            return result.substring(p + REGSTR_TOKEN.length()).trim();
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    static class StreamReader extends Thread {
+        private InputStream is;
+        private StringWriter sw;
+
+        StreamReader(InputStream is) {
+            this.is = is;
+            sw = new StringWriter();
+        }
+
+        @Override
+        public void run() {
+            try {
+                int c;
+                while ((c = is.read()) != -1)
+                    sw.write(c);
+            } catch (IOException e) {
+                System.err.println(e);
+            }
+        }
+
+        String getResult() {
+            return sw.toString();
+        }
+    }
+}