Support pickling EXIF tags.

3 files changed, 78 insertions, 0 deletions

diff --git a/src/pyexiv2/exif.py b/src/pyexiv2/exif.py
index 0e4d308..4f3fe03 100644
--- a/src/pyexiv2/exif.py
+++ b/src/pyexiv2/exif.py
@@ -465,6 +465,15 @@ class ExifTag(ListenerInterface):
              right = self._raw_value
         return '<%s = %s>' % (left, right)
 
+    # Support for pickling.
+    def __getstate__(self):
+        return (self.key, self.raw_value)
+
+    def __setstate__(self, state):
+        key, raw_value = state
+        self._tag = libexiv2python._ExifTag(key)
+        self.raw_value = raw_value
+
 
 class ExifThumbnail(object):
 
diff --git a/test/TestsRunner.py b/test/TestsRunner.py
index 8585295..198bb27 100755
--- a/test/TestsRunner.py
+++ b/test/TestsRunner.py
@@ -40,6 +40,7 @@ from buffer import TestBuffer
 from encoding import TestEncodings
 from utils import TestConversions
 from usercomment import TestUserCommentReadWrite, TestUserCommentAdd
+from pickling import TestPicklingTags
 
 
 def run_unit_tests():
@@ -59,6 +60,7 @@ def run_unit_tests():
     suite.addTest(unittest.defaultTestLoader.loadTestsFromTestCase(TestConversions))
     suite.addTest(unittest.defaultTestLoader.loadTestsFromTestCase(TestUserCommentReadWrite))
     suite.addTest(unittest.defaultTestLoader.loadTestsFromTestCase(TestUserCommentAdd))
+    suite.addTest(unittest.defaultTestLoader.loadTestsFromTestCase(TestPicklingTags))
     # Run the test suite
     return unittest.TextTestRunner(verbosity=2).run(suite)
 
diff --git a/test/pickling.py b/test/pickling.py
new file mode 100644
index 0000000..23ce9f2
--- /dev/null
+++ b/test/pickling.py
@@ -0,0 +1,67 @@
+# -*- coding: utf-8 -*-
+
+# ******************************************************************************
+#
+# Copyright (C) 2010 Olivier Tilloy <olivier@tilloy.net>
+#
+# This file is part of the pyexiv2 distribution.
+#
+# pyexiv2 is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# pyexiv2 is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with pyexiv2; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
+#
+# Author: Olivier Tilloy <olivier@tilloy.net>
+#
+# ******************************************************************************
+
+from pyexiv2.exif import ExifTag
+from pyexiv2.utils import Rational
+
+import unittest
+import pickle
+import datetime
+
+
+class TestPicklingTags(unittest.TestCase):
+
+    def test_pickle_exif_tag(self):
+        tags = []
+        tags.append(ExifTag('Exif.Image.DateTime',
+                            datetime.datetime(2010, 12, 22, 19, 21, 0)))
+        tags.append(ExifTag('Exif.GPSInfo.GPSDateStamp', datetime.date.today()))
+        tags.append(ExifTag('Exif.Image.Copyright', '(C) 2010 Santa Claus'))
+        tags.append(ExifTag('Exif.GPSInfo.GPSVersionID', '0'))
+        tags.append(ExifTag('Exif.Pentax.Temperature', '14'))
+        tags.append(ExifTag('Exif.Photo.UserComment', 'foo bar baz'))
+        tags.append(ExifTag('Exif.Image.BitsPerSample', 8))
+        tags.append(ExifTag('Exif.Image.TimeZoneOffset', 7))
+        tags.append(ExifTag('Exif.Image.ImageWidth', 7492))
+        tags.append(ExifTag('Exif.OlympusCs.ManometerReading', 29))
+        tags.append(ExifTag('Exif.Image.XResolution', Rational(7, 3)))
+        tags.append(ExifTag('Exif.Image.BaselineExposure', Rational(-7, 3)))
+        tags.append(ExifTag('Exif.Photo.ExifVersion', '0100'))
+        for tag in tags:
+            s = pickle.dumps(tag)
+            t = pickle.loads(s)
+            self.assert_(isinstance(t, ExifTag))
+            self.assertEqual(t.key, tag.key)
+            self.assertEqual(t.type, tag.type)
+            self.assertEqual(t.name, tag.name)
+            self.assertEqual(t.label, tag.label)
+            self.assertEqual(t.description, tag.description)
+            self.assertEqual(t.section_name, tag.section_name)
+            self.assertEqual(t.section_description, tag.section_description)
+            self.assertEqual(t.raw_value, tag.raw_value)
+            self.assertEqual(t.value, tag.value)
+            self.assertEqual(t.human_value, tag.human_value)
+