Unidata / python-awips

awips/DateTimeConverter.py

#
# Functions for converting between the various "Java" dynamic serialize types
# used by EDEX to the native python time datetime.
#
#
#     SOFTWARE HISTORY
#
#    Date            Ticket#       Engineer       Description
#    ------------    ----------    -----------    --------------------------
#    06/24/15         #4480        dgilling       Initial Creation.
#

import datetime
import time

from dynamicserialize.dstypes.java.util import Date
from dynamicserialize.dstypes.java.sql import Timestamp
from dynamicserialize.dstypes.com.raytheon.uf.common.time import TimeRange

MAX_TIME = pow(2, 31) - 1
MICROS_IN_SECOND = 1000000


def convertToDateTime(timeArg):

This code seems to be duplicated in your project.

    """
    Converts the given object to a python datetime object. Supports native
    python representations like datetime and struct_time, but also
    the dynamicserialize types like Date and Timestamp. Raises TypeError
    if no conversion can be performed.

    Args:
            timeArg: a python object representing a date and time. Supported
            types include datetime, struct_time, float, int, long and the
            dynamicserialize types Date and Timestamp.

    Returns:
        A datetime that represents the same date/time as the passed in object.
    """
    if isinstance(timeArg, datetime.datetime):
        return timeArg
    elif isinstance(timeArg, time.struct_time):
        return datetime.datetime(*timeArg[:6])
    elif isinstance(timeArg, float):
        # seconds as float, should be avoided due to floating point errors
        totalSecs = int(timeArg)
        micros = int((timeArg - totalSecs) * MICROS_IN_SECOND)
        return _convertSecsAndMicros(totalSecs, micros)
    elif isinstance(timeArg, int):
        # seconds as integer
        totalSecs = timeArg
        return _convertSecsAndMicros(totalSecs, 0)
    elif isinstance(timeArg, (Date, Timestamp)):
        totalSecs = timeArg.getTime()
        return _convertSecsAndMicros(totalSecs, 0)
    else:
        objType = str(type(timeArg))
        raise TypeError("Cannot convert object of type " + objType + " to datetime.")


def _convertSecsAndMicros(seconds, micros):
    if seconds < MAX_TIME:
        rval = datetime.datetime.utcfromtimestamp(seconds)
    else:
        extraTime = datetime.timedelta(seconds=(seconds - MAX_TIME))
        rval = datetime.datetime.utcfromtimestamp(MAX_TIME) + extraTime
    return rval.replace(microsecond=micros)


def constructTimeRange(*args):

This code seems to be duplicated in your project.

    """
    Builds a python dynamicserialize TimeRange object from the given
    arguments.

    Args:
            args*: must be a TimeRange or a pair of objects that can be
                   converted to a datetime via convertToDateTime().

    Returns:
        A TimeRange.
    """

    if len(args) == 1 and isinstance(args[0], TimeRange):
        return args[0]
    if len(args) != 2:
        raise TypeError("constructTimeRange takes exactly 2 arguments, " + str(len(args)) + " provided.")
    startTime = convertToDateTime(args[0])
    endTime = convertToDateTime(args[1])
    return TimeRange(startTime, endTime)