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# FIXME: This probably belongs in the buildbot module.
class RegressionWindow(object):
    def __init__(self, build_before_failure, failing_build, failing_tests=None):
        self._build_before_failure = build_before_failure
        self._failing_build = failing_build
        self._failing_tests = failing_tests
        self._revisions = None

    def build_before_failure(self):
        return self._build_before_failure

    def failing_build(self):
        return self._failing_build

    def failing_tests(self):
        return self._failing_tests

    def revisions(self):
        # Cache revisions to avoid excessive allocations.
        if not self._revisions:
            self._revisions = range(self._failing_build.revision(), self._build_before_failure.revision(), -1)
            self._revisions.reverse()
        return self._revisions