Program: 34421
Project: 34421
Buggy source:
/** 
 * Answers the incoming URI.
 * @param uri the request URI.
 * @return the response.
 */
private MatrixCursor doAnswerApiCommand(Uri uri){
  MatrixCursor matrixCursor=null;
  String lastPathSegment=uri.getLastPathSegment();
  if (BaseFile.CMD_CANCEL.equals(lastPathSegment)) {
    int taskId=ProviderUtils.getIntQueryParam(uri,BaseFile.PARAM_TASK_ID,0);
synchronized (mMapInterruption) {
      if (taskId == 0) {
        for (int i=0; i < mMapInterruption.size(); i++)         mMapInterruption.put(mMapInterruption.keyAt(i),true);
      }
 else       if (mMapInterruption.indexOfKey(taskId) >= 0)       mMapInterruption.put(taskId,true);
    }
    return null;
  }
 else   if (BaseFile.CMD_GET_DEFAULT_PATH.equals(lastPathSegment)) {
    return null;
  }
 else   if (BaseFile.CMD_IS_ANCESTOR_OF.equals(lastPathSegment)) {
    return doCheckAncestor(uri);
  }
 else   if (BaseFile.CMD_GET_PARENT.equals(lastPathSegment)) {
{
      String path=Uri.parse(uri.getQueryParameter(BaseFile.PARAM_SOURCE)).toString();
      String parentPath=getParentPath(path);
      if (parentPath == null) {
        if (Utils.doLog())         Log.d(CLASSNAME,"String_Node_Str");
        return null;
      }
      FileEntry e=this.getFileEntryCached(parentPath);
      matrixCursor=BaseFileProviderUtils.newBaseFileCursor();
      int type=parentPath != null ? BaseFile.FILE_TYPE_DIRECTORY : BaseFile.FILE_TYPE_NOT_EXISTED;
      RowBuilder newRow=matrixCursor.newRow();
      newRow.add(0);
      newRow.add(BaseFile.genContentIdUriBase(getAuthority()).buildUpon().appendPath(parentPath).build().toString());
      newRow.add(e.path);
      newRow.add(e.displayName);
      newRow.add(e.canRead);
      newRow.add(e.canWrite);
      newRow.add(0);
      newRow.add(type);
      newRow.add(0);
      newRow.add(FileUtils.getResIcon(type,e.displayName));
      return matrixCursor;
    }
  }
 else   if (BaseFile.CMD_SHUTDOWN.equals(lastPathSegment)) {
  }
 else   if (BaseFile.CMD_CHECK_CONNECTION.equals(lastPathSegment)) {
    return getCheckConnectionCursor(uri);
  }
  return matrixCursor;
}

Fixed version (ground truth):
/** 
 * Answers the incoming URI.
 * @param uri the request URI.
 * @return the response.
 */
private MatrixCursor doAnswerApiCommand(Uri uri){
  MatrixCursor matrixCursor=null;
  String lastPathSegment=uri.getLastPathSegment();
  if (BaseFile.CMD_CANCEL.equals(lastPathSegment)) {
    int taskId=ProviderUtils.getIntQueryParam(uri,BaseFile.PARAM_TASK_ID,0);
synchronized (mMapInterruption) {
      if (taskId == 0) {
        for (int i=0; i < mMapInterruption.size(); i++)         mMapInterruption.put(mMapInterruption.keyAt(i),true);
      }
 else       if (mMapInterruption.indexOfKey(taskId) >= 0)       mMapInterruption.put(taskId,true);
    }
    return null;
  }
 else   if (BaseFile.CMD_GET_DEFAULT_PATH.equals(lastPathSegment)) {
    return null;
  }
 else   if (BaseFile.CMD_IS_ANCESTOR_OF.equals(lastPathSegment)) {
    return doCheckAncestor(uri);
  }
 else   if (BaseFile.CMD_GET_PARENT.equals(lastPathSegment)) {
{
      String path=Uri.parse(uri.getQueryParameter(BaseFile.PARAM_SOURCE)).toString();
      String parentPath=getParentPath(path);
      if (parentPath == null) {
        if (Utils.doLog())         Log.d(CLASSNAME,"String_Node_Str");
        return null;
      }
      FileEntry e;
      try {
        e=this.getFileEntryCached(parentPath);
      }
 catch (      Exception ex) {
        ex.printStackTrace();
        return null;
      }
      if (e == null)       return null;
      matrixCursor=BaseFileProviderUtils.newBaseFileCursor();
      int type=parentPath != null ? BaseFile.FILE_TYPE_DIRECTORY : BaseFile.FILE_TYPE_NOT_EXISTED;
      RowBuilder newRow=matrixCursor.newRow();
      newRow.add(0);
      newRow.add(BaseFile.genContentIdUriBase(getAuthority()).buildUpon().appendPath(parentPath).build().toString());
      newRow.add(e.path);
      newRow.add(e.displayName);
      newRow.add(e.canRead);
      newRow.add(e.canWrite);
      newRow.add(0);
      newRow.add(type);
      newRow.add(0);
      newRow.add(FileUtils.getResIcon(type,e.displayName));
      return matrixCursor;
    }
  }
 else   if (BaseFile.CMD_SHUTDOWN.equals(lastPathSegment)) {
  }
 else   if (BaseFile.CMD_CHECK_CONNECTION.equals(lastPathSegment)) {
    return getCheckConnectionCursor(uri);
  }
  return matrixCursor;
}