Code cleanup: add getExtension and getName in FileUtils.java

MyTracks/src/com/google/android/apps/mytracks/util/FileUtils.java

@@ -144,6 +144,32 @@ public class FileUtils {
     return buildUniqueFileName(directory, fileBaseName, extension, 0);
   }
 
+  /**
+   * Gets the name from a file name, without the extension.
+   * 
+   * @param fileName the file name
+   */
+  public static String getName(String fileName) {
+    int index = fileName.lastIndexOf('.');
+    if (index == -1) {
+      return fileName;
+    }
+    return fileName.substring(0, index);    
+  }
+  
+  /**
+   * Gets the extension from a file name. Returns null if there is no extension.
+   * 
+   * @param fileName the file name
+   */
+  public static String getExtension(String fileName) {
+    int index = fileName.lastIndexOf('.');
+    if (index == -1) {
+      return null;
+    }
+    return fileName.substring(index + 1);
+  }  
+ 
   /**
    * Builds a filename with the given base and the given extension, possibly
    * adding a suffix to ensure the file doesn't exist.