rebaseline_server: create ImagePairSet-- holds a number of ImagePairs to examine

gm/rebaseline_server/column.py

Index: gm/rebaseline_server/column.py
diff --git a/gm/rebaseline_server/column.py b/gm/rebaseline_server/column.py
new file mode 100644
index 0000000000000000000000000000000000000000..7bce15a2502e05c0dcd846785cbfa535323df0fc
--- /dev/null
+++ b/gm/rebaseline_server/column.py
@@ -0,0 +1,64 @@
+#!/usr/bin/python
+
+"""
+Copyright 2014 Google Inc.
+
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+
+ColumnHeaderFactory class (see class docstring for details)
+"""
+
+# Keys used within dictionary representation of each column header.
+KEY__HEADER_TEXT = 'headerText'
+KEY__HEADER_URL = 'headerUrl'
+KEY__IS_FILTERABLE = 'isFilterable'
+KEY__IS_SORTABLE = 'isSortable'
+KEY__VALUES_AND_COUNTS = 'valuesAndCounts'
+
+
+class ColumnHeaderFactory(object):
+  """Factory which assembles the header for a single column of data."""
+
+  def __init__(self, header_text, header_url=None,
+               is_filterable=True, is_sortable=True,
+               include_values_and_counts=True):
+    """
+    Args:
+      header_text: string; text the client should display within column header.
+      header_url: string; target URL if user clicks on column header.
+          If None, nothing to click on.
+      is_filterable: boolean; whether client should allow filtering on this
+          column.
+      is_sortable: boolean; whether client should allow sorting on this column.
+      include_values_and_counts: boolean; whether the set of values found
+          within this column, and their counts, should be available for the
+          client to display.
+    """
+    self._header_text = header_text
+    self._header_url = header_url
+    self._is_filterable = is_filterable
+    self._is_sortable = is_sortable
+    self._include_values_and_counts = include_values_and_counts
+
+  def create_as_dict(self, values_and_counts_dict=None):
+    """Creates the header for this column, in dictionary form.
+
+    Creates the header for this column in dictionary form, as needed when
+    constructing the JSON representation.  Uses the KEY__* constants as keys.
+
+    Args:
+      values_and_counts_dict: dictionary mapping each possible column value
+          to its count (how many entries in the column have this value), or
+          None if this information is not available.
+    """
+    asdict = {
+        KEY__HEADER_TEXT: self._header_text,
+        KEY__IS_FILTERABLE: self._is_filterable,
+        KEY__IS_SORTABLE: self._is_sortable,
+    }
+    if self._header_url:
+      asdict[KEY__HEADER_URL] = self._header_url
+    if self._include_values_and_counts and values_and_counts_dict:
+      asdict[KEY__VALUES_AND_COUNTS] = values_and_counts_dict
+    return asdict