Implementing Bigtable ColumnRangeFilter.

Author: dhermes

gcloud/bigtable/row.py

@@ -227,6 +227,79 @@ def to_pb(self):
         return data_pb2.RowFilter(column_qualifier_regex_filter=self.regex)
 
 
+class ColumnRangeFilter(RowFilter):
+    """A row filter to restrict to a range of columns.
+
+    Both the start and end column can be included or excluded in the range.
+    By default, we include them both, but this can be changed with optional
+    flags.
+
+    :type column_family_id: str
+    :param column_family_id: The column family that contains the columns. Must
+                             be of the form ``[_a-zA-Z0-9][-_.a-zA-Z0-9]*``.
+
+    :type start_column: bytes
+    :param start_column: The start of the range of columns. If no value is
+                         used, the backend applies no upper bound to the
+                         values.
+
+    :type end_column: bytes
+    :param end_column: The end of the range of columns. If no value is used,
+                       the backend applies no upper bound to the values.
+
+    :type inclusive_start: bool
+    :param inclusive_start: Boolean indicating if the start column should be
+                            included in the range (or excluded).
+
+    :type inclusive_end: bool
+    :param inclusive_end: Boolean indicating if the end column should be
+                          included in the range (or excluded).
+    """
+
+    def __init__(self, column_family_id, start_column=None, end_column=None,
+                 inclusive_start=True, inclusive_end=True):
+        self.column_family_id = column_family_id
+        self.start_column = start_column
+        self.end_column = end_column
+        self.inclusive_start = inclusive_start
+        self.inclusive_end = inclusive_end
+
+    def __eq__(self, other):
+        if not isinstance(other, self.__class__):
+            return False
+        return (other.column_family_id == self.column_family_id and
+                other.start_column == self.start_column and
+                other.end_column == self.end_column and
+                other.inclusive_start == self.inclusive_start and
+                other.inclusive_end == self.inclusive_end)
+
+    def to_pb(self):
+        """Converts the row filter to a protobuf.
+
+        First converts to a :class:`.data_pb2.ColumnRange` and then uses it
+        in the ``column_range_filter`` field.
+
+        :rtype: :class:`.data_pb2.RowFilter`
+        :returns: The converted current object.
+        """
+        column_range_kwargs = {'family_name': self.column_family_id}
+        if self.start_column is not None:
+            if self.inclusive_start:
+                key = 'start_qualifier_inclusive'
+            else:
+                key = 'start_qualifier_exclusive'
+            column_range_kwargs[key] = _to_bytes(self.start_column)
+        if self.end_column is not None:
+            if self.inclusive_end:
+                key = 'end_qualifier_inclusive'
+            else:
+                key = 'end_qualifier_exclusive'
+            column_range_kwargs[key] = _to_bytes(self.end_column)
+
+        column_range = data_pb2.ColumnRange(**column_range_kwargs)
+        return data_pb2.RowFilter(column_range_filter=column_range)
+
+
 class ValueRegexFilter(_RegexFilter):
     """Row filter for a value regular expression.
 

gcloud/bigtable/test_row.py

@@ -230,6 +230,128 @@ def test_to_pb(self):
         self.assertEqual(pb_val, expected_pb)
 
 
+class TestColumnRangeFilter(unittest2.TestCase):
+
+    def _getTargetClass(self):
+        from gcloud.bigtable.row import ColumnRangeFilter
+        return ColumnRangeFilter
+
+    def _makeOne(self, *args, **kwargs):
+        return self._getTargetClass()(*args, **kwargs)
+
+    def test_constructor_defaults(self):
+        column_family_id = object()
+        row_filter = self._makeOne(column_family_id)
+        self.assertTrue(row_filter.column_family_id is column_family_id)
+        self.assertEqual(row_filter.start_column, None)
+        self.assertEqual(row_filter.end_column, None)
+        self.assertTrue(row_filter.inclusive_start)
+        self.assertTrue(row_filter.inclusive_end)
+
+    def test_constructor_explicit(self):
+        column_family_id = object()
+        start_column = object()
+        end_column = object()
+        inclusive_start = object()
+        inclusive_end = object()
+        row_filter = self._makeOne(column_family_id, start_column=start_column,
+                                   end_column=end_column,
+                                   inclusive_start=inclusive_start,
+                                   inclusive_end=inclusive_end)
+        self.assertTrue(row_filter.column_family_id is column_family_id)
+        self.assertTrue(row_filter.start_column is start_column)
+        self.assertTrue(row_filter.end_column is end_column)
+        self.assertTrue(row_filter.inclusive_start is inclusive_start)
+        self.assertTrue(row_filter.inclusive_end is inclusive_end)
+
+    def test___eq__(self):
+        column_family_id = object()
+        start_column = object()
+        end_column = object()
+        inclusive_start = object()
+        inclusive_end = object()
+        row_filter1 = self._makeOne(column_family_id,
+                                    start_column=start_column,
+                                    end_column=end_column,
+                                    inclusive_start=inclusive_start,
+                                    inclusive_end=inclusive_end)
+        row_filter2 = self._makeOne(column_family_id,
+                                    start_column=start_column,
+                                    end_column=end_column,
+                                    inclusive_start=inclusive_start,
+                                    inclusive_end=inclusive_end)
+        self.assertEqual(row_filter1, row_filter2)
+
+    def test___eq__type_differ(self):
+        column_family_id = object()
+        row_filter1 = self._makeOne(column_family_id)
+        row_filter2 = object()
+        self.assertNotEqual(row_filter1, row_filter2)
+
+    def test_to_pb(self):
+        from gcloud.bigtable._generated import bigtable_data_pb2 as data_pb2
+
+        column_family_id = u'column-family-id'
+        row_filter = self._makeOne(column_family_id)
+        col_range_pb = data_pb2.ColumnRange(family_name=column_family_id)
+        expected_pb = data_pb2.RowFilter(column_range_filter=col_range_pb)
+        self.assertEqual(row_filter.to_pb(), expected_pb)
+
+    def test_to_pb_inclusive_start(self):
+        from gcloud.bigtable._generated import bigtable_data_pb2 as data_pb2
+
+        column_family_id = u'column-family-id'
+        column = b'column'
+        row_filter = self._makeOne(column_family_id, start_column=column)
+        col_range_pb = data_pb2.ColumnRange(
+            family_name=column_family_id,
+            start_qualifier_inclusive=column,
+        )
+        expected_pb = data_pb2.RowFilter(column_range_filter=col_range_pb)
+        self.assertEqual(row_filter.to_pb(), expected_pb)
+
+    def test_to_pb_exclusive_start(self):
+        from gcloud.bigtable._generated import bigtable_data_pb2 as data_pb2
+
+        column_family_id = u'column-family-id'
+        column = b'column'
+        row_filter = self._makeOne(column_family_id, start_column=column,
+                                   inclusive_start=False)
+        col_range_pb = data_pb2.ColumnRange(
+            family_name=column_family_id,
+            start_qualifier_exclusive=column,
+        )
+        expected_pb = data_pb2.RowFilter(column_range_filter=col_range_pb)
+        self.assertEqual(row_filter.to_pb(), expected_pb)
+
+    def test_to_pb_inclusive_end(self):
+        from gcloud.bigtable._generated import bigtable_data_pb2 as data_pb2
+
+        column_family_id = u'column-family-id'
+        column = b'column'
+        row_filter = self._makeOne(column_family_id, end_column=column)
+        col_range_pb = data_pb2.ColumnRange(
+            family_name=column_family_id,
+            end_qualifier_inclusive=column,
+        )
+        expected_pb = data_pb2.RowFilter(column_range_filter=col_range_pb)
+        self.assertEqual(row_filter.to_pb(), expected_pb)
+
+    def test_to_pb_exclusive_end(self):
+        from gcloud.bigtable._generated import bigtable_data_pb2 as data_pb2
+
+        column_family_id = u'column-family-id'
+        column = b'column'
+        row_filter = self._makeOne(column_family_id, end_column=column,
+                                   inclusive_end=False)
+        col_range_pb = data_pb2.ColumnRange(
+            family_name=column_family_id,
+            end_qualifier_exclusive=column,
+        )
+        expected_pb = data_pb2.RowFilter(column_range_filter=col_range_pb)
+        self.assertEqual(row_filter.to_pb(), expected_pb)
+
+
 class TestValueRegexFilter(unittest2.TestCase):
 
     def _getTargetClass(self):