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##
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from __future__ import division

from datetime import date, datetime

from vistrails.core.system import strftime, time_strptime

class XMLDAO:
    def __init__(self):
        pass

    def hasAttribute(self, node, attr):
        return node.hasAttribute(attr)

    def getAttribute(self, node, attr):
        try:
            attribute = node.attributes.get(attr)
            if attribute is not None:
                return attribute.value
        except KeyError:
            pass
        return None

    def convertFromStr(self, value, type):
        if value is not None:
            if type == 'str':
                return str(value)
            elif value.strip() != '':
                if type == 'long':
                    return long(value)
                elif type == 'float':
                    return float(value)
                elif type == 'int':
                    try:
                        return int(value)
                    except ValueError:
                        if 'False' == value:
                            return -1
                        else:
                            return 0
                elif type == 'date':
                    return date(*time_strptime(value, '%Y-%m-%d')[0:3])
                elif type == 'datetime':
                   return datetime(*time_strptime(value, '%Y-%m-%d %H:%M:%S')[0:6])
        return None

    def convertToStr(self, value, type):
        if value is not None:
            if type == 'date':
                return value.isoformat()
            elif type == 'datetime':
                return strftime(value, '%Y-%m-%d %H:%M:%S')
            else:
                return str(value)
        return ''
