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# $Header: /export/home/gjanee/mm/bucket_types/RCS/numeric.py,v 1.1 2005/02/10 21:57:43 gjanee Exp $

# DESCRIPTION
#
#     The "numeric" bucket type.
#
# AUTHOR
#
#     Greg Janee
#     gjanee@alexandria.ucsb.edu
#
# HISTORY
#
#     $Log: numeric.py,v $
#     Revision 1.1  2005/02/10 21:57:43  gjanee
#     Initial revision
#

from ADL_mapper import bucketType, fatal
from bucket_types.utils import checkValue, encodeField, fieldErrorClause

def _validate (bucket, field, value, strict):
    value = checkValue(bucket, "numeric", ["!", "!?"], field, value, strict)
    if value == None: return None
    try:
        v = float(value[0])
    except ValueError:
        if strict:
            fatal(("invalid value mapped to numeric bucket '%s'%s:" +\
                " invalid number: %s") % (bucket, fieldErrorClause(field),
                value))
        else:
            return None
    v = [v]
    if len(value) > 1 and value[1] != None: v.append(value[1])
    return (field, tuple(v))

def _encode (document, field, value):
    nv = document.createElement("numeric-value")
    encodeField(document, nv, field)
    v = document.createElement("value")
    if len(value) > 1: v.setAttribute("unit", value[1])
    v.appendChild(document.createTextNode(str(value[0])))
    nv.appendChild(v)
    return nv

bucketType("numeric", _validate, _encode)