From 2dd1f5ca2e0416f4d6103e136bf867076812c3fb Mon Sep 17 00:00:00 2001
From: Leo Singer <leo.singer@ligo.org>
Date: Sat, 22 Jul 2017 09:28:49 -0600
Subject: [PATCH] Introduce custom exception class Original:
 136222252030abe406e3ec00f907eeb1f6ed043f

---
 .../python/lalinference/io/events/detector_disabled.py | 10 +++++++---
 lalinference/test/test_io_events.py                    |  4 ++--
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/lalinference/python/lalinference/io/events/detector_disabled.py b/lalinference/python/lalinference/io/events/detector_disabled.py
index e2eec20afd..b3a87fd577 100644
--- a/lalinference/python/lalinference/io/events/detector_disabled.py
+++ b/lalinference/python/lalinference/io/events/detector_disabled.py
@@ -19,7 +19,11 @@ Modify events by artificially disabling specified detectors.
 """
 from .base import *
 
-__all__ = ('DetectorDisabledEventSource',)
+__all__ = ('DetectorDisabledEventSource', 'DetectorDisabledError')
+
+
+class DetectorDisabledError(ValueError):
+    pass
 
 
 class DetectorDisabledEventSource(EventSource):
@@ -51,13 +55,13 @@ class DetectorDisabledEvent(Event):
         if self.source.raises:
             detectors = {s.detector for s in self.base_event.singles}
             if not detectors & disabled_detectors:
-                raise ValueError(
+                raise DetectorDisabledError(
                     'Disabling detectors {{{}}} would have no effect on this '
                     'event with detectors {{{}}}'.format(
                         ' '.join(disabled_detectors),
                         ' '.join(detectors)))
             if not detectors - disabled_detectors:
-                raise ValueError(
+                raise DetectorDisabledError(
                     'Disabling detectors {{{}}} would exclude all data for '
                     'this event with detectors {{{}}}'.format(
                         ' '.join(disabled_detectors),
diff --git a/lalinference/test/test_io_events.py b/lalinference/test/test_io_events.py
index b74a4e3193..c48deaa880 100644
--- a/lalinference/test/test_io_events.py
+++ b/lalinference/test/test_io_events.py
@@ -158,7 +158,7 @@ def test_detector_disabled():
     for event in nonraising_source.values():
         event.singles
     for event in raising_source.values():
-        with raises(ValueError, expected_message):
+        with raises(events.DetectorDisabledError, expected_message):
             event.singles
 
     # Now test that exceptions are raised when they are called for.
@@ -171,7 +171,7 @@ def test_detector_disabled():
     for event in nonraising_source.values():
         event.singles
     for event in raising_source.values():
-        with raises(ValueError, expected_message):
+        with raises(events.DetectorDisabledError, expected_message):
             event.singles
 
 def test_hdf(tmpdir):
-- 
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