Source code for openquake.hmtk.parsers.catalogue.base

# -*- coding: utf-8 -*-
# vim: tabstop=4 shiftwidth=4 softtabstop=4

#
# LICENSE
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# Copyright (c) 2010-2017, GEM Foundation, G. Weatherill, M. Pagani,
# D. Monelli.
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# The Hazard Modeller's Toolkit is free software: you can redistribute
# it and/or modify it under the terms of the GNU Affero General Public
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# The software Hazard Modeller's Toolkit (openquake.hmtk) provided herein
# is released as a prototype implementation on behalf of
# scientists and engineers working within the GEM Foundation (Global
# Earthquake Model).
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# It is distributed for the purpose of open collaboration and in the
# hope that it will be useful to the scientific, engineering, disaster
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# The software is NOT distributed as part of GEM’s OpenQuake suite
# (https://www.globalquakemodel.org/tools-products) and must be considered as a
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"""
Module :mod:`openquake.hmtk.parsers.catalogue.base` defines an abstract base class
for :class:`CatalogueParser <BaseCatalogueParser>`.
"""
import abc
import os.path


class BaseCatalogueParser(object):
    """
    A base class for a Catalogue Parser
    """
    __metaclass__ = abc.ABCMeta

    def __init__(self, input_file):
        """
        Initialise the object and check input file existance
        """
        self.input_file = input_file
        if not os.path.exists(self.input_file):
            raise IOError('File not found')

    @abc.abstractmethod
    def read_file(self):
        """
        Return an instance of the class :class:`Catalogue`
        """


class BaseCatalogueWriter(object):
    """
    A base class for a Catalogue writer
    """
    __metaclass__ = abc.ABCMeta

    def __init__(self, output_file):
        """
        Initialise the object and check output file existance. If file already
        exists then raise error
        """
        self.output_file = output_file
        if os.path.exists(self.output_file):
            raise IOError('Catalogue output file %s already exists!' %
                          self.output_file)

    @abc.abstractmethod
    def write_file(self):
        """
        Return an instance of the class :class:`Catalogue`
        """