Source code for sttp.data.expression

# ******************************************************************************************************
#  expression.py - Gbtc
#
#  Copyright © 2022, Grid Protection Alliance.  All Rights Reserved.
#
#  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See
#  the NOTICE file distributed with this work for additional information regarding copyright ownership.
#  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may not use this
#  file except in compliance with the License. You may obtain a copy of the License at:
#
#      http://opensource.org/licenses/MIT
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#  Unless agreed to in writing, the subject software distributed under the License is distributed on an
#  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the
#  License for the specific language governing permissions and limitations.
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#  Code Modification History:
#  ----------------------------------------------------------------------------------------------------
#  09/03/2022 - J. Ritchie Carroll
#       Generated original version of source code.
#
# ******************************************************************************************************

from gsf import virtual
from .constants import ExpressionType




class Expression:
    """
    Represents any expression type.
    
    Notes
    -----
    This is the base class for all expression types.
    """

    @virtual
    @property
    def expressiontype(self) -> ExpressionType:
        """
        Gets the type of the expression.
        """

        raise NotImplementedError()