Program: 162426
Project: 162426
Buggy source:
/** 
 * Get a DocumentFile corresponding to the given file (for writing on ExtSdCard on Android 5). If the file is not existing, it is created.
 * @param file        The file.
 * @param isDirectory flag indicating if the file should be a directory.
 * @return The DocumentFile
 */
public static DocumentFile getDocumentFile(final File file,final boolean isDirectory,Context context){
  String baseFolder=getExtSdCardFolder(file,context);
  boolean originalDirectory=false;
  if (baseFolder == null) {
    return null;
  }
  String relativePath=null;
  try {
    String fullPath=file.getCanonicalPath();
    if (!baseFolder.equals(fullPath))     relativePath=fullPath.substring(baseFolder.length() + 1);
 else     originalDirectory=true;
  }
 catch (  IOException e) {
    return null;
  }
catch (  Exception f) {
    originalDirectory=true;
  }
  String as=PreferenceManager.getDefaultSharedPreferences(context).getString(PreferencesConstants.PREFERENCE_URI,null);
  Uri treeUri=null;
  if (as != null)   treeUri=Uri.parse(as);
  if (treeUri == null) {
    return null;
  }
  DocumentFile document=DocumentFile.fromTreeUri(context,treeUri);
  if (originalDirectory)   return document;
  String[] parts=relativePath.split("String_Node_Str");
  for (int i=0; i < parts.length; i++) {
    DocumentFile nextDocument=document.findFile(parts[i]);
    if (nextDocument == null) {
      if ((i < parts.length - 1) || isDirectory) {
        nextDocument=document.createDirectory(parts[i]);
      }
 else {
        nextDocument=document.createFile("String_Node_Str",parts[i]);
      }
    }
    document=nextDocument;
  }
  return document;
}

Fixed version (ground truth):
/** 
 * Get a DocumentFile corresponding to the given file (for writing on ExtSdCard on Android 5). If the file is not existing, it is created.
 * @param file        The file.
 * @param isDirectory flag indicating if the file should be a directory.
 * @return The DocumentFile
 */
public static DocumentFile getDocumentFile(final File file,final boolean isDirectory,Context context){
  if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT)   return DocumentFile.fromFile(file);
  String baseFolder=getExtSdCardFolder(file,context);
  boolean originalDirectory=false;
  if (baseFolder == null) {
    return null;
  }
  String relativePath=null;
  try {
    String fullPath=file.getCanonicalPath();
    if (!baseFolder.equals(fullPath))     relativePath=fullPath.substring(baseFolder.length() + 1);
 else     originalDirectory=true;
  }
 catch (  IOException e) {
    return null;
  }
catch (  Exception f) {
    originalDirectory=true;
  }
  String as=PreferenceManager.getDefaultSharedPreferences(context).getString(PreferencesConstants.PREFERENCE_URI,null);
  Uri treeUri=null;
  if (as != null)   treeUri=Uri.parse(as);
  if (treeUri == null) {
    return null;
  }
  DocumentFile document=DocumentFile.fromTreeUri(context,treeUri);
  if (originalDirectory)   return document;
  String[] parts=relativePath.split("String_Node_Str");
  for (int i=0; i < parts.length; i++) {
    DocumentFile nextDocument=document.findFile(parts[i]);
    if (nextDocument == null) {
      if ((i < parts.length - 1) || isDirectory) {
        nextDocument=document.createDirectory(parts[i]);
      }
 else {
        nextDocument=document.createFile("String_Node_Str",parts[i]);
      }
    }
    document=nextDocument;
  }
  return document;
}