gremlin-python/src/main/jython/gremlin_python/statics.py

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# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
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from types import FunctionType

import six
from aenum import Enum


if six.PY3:
    class long(int): pass
    FloatType = float
    IntType = int
    LongType = long
    TypeType = type
    ListType = list
    DictType = dict
    SetType = set
    ByteBufferType = bytes
else:
    long = long
    SetType = set
    ByteBufferType = bytearray
    from types import FloatType
    from types import IntType
    from types import LongType
    from types import TypeType
    from types import ListType
    from types import DictType
    from types import TypeType


class timestamp(float):
    """
    In Python a timestamp is simply a float. This dummy class (similar to long), allows users to wrap a float
    in a GLV script to make sure the value is serialized as a Gremlin timestamp.
    """
    pass


class SingleByte(int):
    """
    Provides a way to pass a single byte via Gremlin.
    """
    def __new__(cls, b):
        if -128 <= b < 128:
            int.__new__(cls, b)
        else:
            raise ValueError("value must be between -128 and 127 inclusive")


class SingleChar(str):
    """
    Provides a way to pass a single character via Gremlin.
    """
    def __new__(cls, c):
        if len(b) == 1:
            str.__new__(cls, c)
        else:
            raise ValueError("string must contain a single character")


class GremlinType(object):
    """
    Provides a way to represent a "Java class" for Gremlin.
    """
    def __init__(self, gremlin_type):
        self.gremlin_type = gremlin_type
        

staticMethods = {}
staticEnums = {}
default_lambda_language = "gremlin-python"


def add_static(key, value):
    if isinstance(value, Enum):
        staticEnums[key] = value
    else:
        staticMethods[key] = value


def load_statics(global_dict):
    for key in staticMethods:
        global_dict[key] = staticMethods[key]
    for key in staticEnums:
        global_dict[key] = staticEnums[key]


def unload_statics(global_dict):
    for key in staticMethods:
        if key in global_dict:
            del global_dict[key]
    for key in staticEnums:
        if key in global_dict:
            del global_dict[key]