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"""A simple transformation that truncates the text of input documents to a
given character length."""
from annif.exception import ConfigurationException
from . import transform
class InputLimiter(transform.BaseTransform):
name = 'limit'
def __init__(self, project, input_limit):
super().__init__(project)
self.input_limit = int(input_limit)
self._validate_value(self.input_limit)
def transform_fn(self, text):
return text[:self.input_limit]
def _validate_value(self, input_limit):
if input_limit < 0:
raise ConfigurationException(
'input_limit in limit_input transform cannot be negative',
project_id=self.project.project_id)