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ExRangeValidator.py
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ExRangeValidator.py
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from zope.interface import implements
from Products.validation.interfaces.IValidator import IValidator
from Products.validation import validation
class ExRangeValidator:
""" Validates whether or not a numeric value is within a range.
minval and maxval *inclusive* may come from initialization,
from the kwargs in a call or from field attributes.
"""
implements(IValidator)
name = 'ExRangeValidator'
def __init__(self, name, minval=0.0, maxval=0.0, title='', description=''):
self.name = name
self.minval = minval
self.maxval = maxval
self.title = title or name
self.description = description
def __call__(self, value, *args, **kwargs):
field = kwargs.get('field', None)
# get maxval
if kwargs.has_key('maxval'):
maxval = kwargs.get('maxval')
elif hasattr(field, 'maxval'):
maxval = float(field.maxval)
else:
# set to given default value (default defaults to 0)
maxval = self.maxval
# get minval
if kwargs.has_key('minval'):
minval = kwargs.get('minval')
elif hasattr(field, 'minval'):
minval = float(field.minval)
else:
# set to given default value (default defaults to 0)
minval = self.minval
if (minval > maxval):
return ("Validation failed(%(name)s): minval (%(min)s) > maxval (%(max)s)" %
{ 'name' : self.name, 'min' : minval, 'max' : maxval,})
try:
nval = float(value)
except ValueError:
return ("Validation failed(%(name)s): could not convert '%(value)s' to number" %
{ 'name' : self.name, 'value': value})
if minval <= nval <= maxval:
return 1
if minval > nval:
return ("Validation failed(%(name)s): '%(value)s' is too small. Must be at least %(min)s." %
{ 'name' : self.name, 'value': value, 'min' : minval,})
else:
return ("Validation failed(%(name)s): '%(value)s' is too large. Must be no greater than %(max)s." %
{ 'name' : self.name, 'value': value, 'max' : maxval,})
validation.register(ExRangeValidator('inExNumericRange'))