1 files changed, 126 insertions, 0 deletions
diff --git a/build/download/downloader.py b/build/download/downloader.py
new file mode 100644
index 00000000..b8e9ed50
--- /dev/null
+++ b/build/download/downloader.py
@@ -0,0 +1,126 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+#   COPYRIGHT NOTICE STARTS HERE
+
+#   Copyright 2019 © Samsung Electronics Co., Ltd.
+#
+#   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.
+
+#   COPYRIGHT NOTICE ENDS HERE
+
+import logging
+from abc import ABC, abstractmethod
+
+import prettytable
+
+log = logging.getLogger(__name__)
+
+
+class AbstractDownloader(ABC):
+
+    def __init__(self, list_type, *list_args):
+        self._list_type = list_type
+        self._data_list = {item: list_arg[1] for list_arg in list_args
+                           for item in self._load_list(list_arg[0])}
+        self._missing = self.missing()
+
+    @property
+    def list_type(self):
+        """
+        Type of resource in list
+        """
+        return self._list_type
+
+    @staticmethod
+    def _load_list(path):
+        """
+        Load list from file.
+        :param path: path to file
+        :return: set of items in list
+        """
+        with open(path, 'r') as f:
+            return {item for item in (line.strip() for line in f)
+                    if item and not item.startswith('#')}
+
+    @staticmethod
+    def _check_table(header, alignment_dict, data):
+        """
+        General method to generate table
+        :param header: header of the table
+        :param alignment_dict: dictionary with alignment for columns
+        :param data: iterable of rows of table
+        :return: table formatted data
+        """
+        table = prettytable.PrettyTable(header)
+
+        for k, v in alignment_dict.items():
+            table.align[k] = v
+
+        for row in sorted(data):
+            table.add_row(row)
+
+        return table
+
+    @abstractmethod
+    def download(self):
+        """
+        Download resources from lists
+        """
+        pass
+
+    @abstractmethod
+    def _is_missing(self, item):
+        """
+        Check if item is not downloaded
+        """
+        pass
+
+    def missing(self):
+        """
+        Check for missing data (not downloaded)
+        :return: dictionary of missing items
+        """
+        self._missing = {item: dst for item, dst in self._data_list.items() if
+                         self._is_missing(item)}
+        return self._missing
+
+    def _log_existing(self):
+        """
+        Log items that are already downloaded.
+        """
+        for item in self._merged_lists():
+            if item not in self._missing:
+                log.info('File or directory present: {}'.format(item))
+
+    def _merged_lists(self):
+        """
+        Get all item names in one set
+        :return: set with all items
+        """
+        return set(self._data_list.keys())
+
+    def _initial_log(self):
+        """
+        Log initial info for download.
+        :return: True if download is necessary False if everything is already downloaded
+        """
+        self._log_existing()
+        items_left = len(self._missing)
+        class_name = type(self).__name__
+        if items_left == 0:
+            log.info('{}: Everything seems to be present no download necessary.'.format(class_name))
+            return False
+        log.info('{}: Initializing download {} {} are not present.'.format(class_name, items_left,
+                                                                           self._list_type))
+        return True