# Source code for obspy.io.json.default

    # -*- coding: utf-8 -*-
    """
    JSON Encoder default function

    This module provides:
    ---------------------
    Default : a class to create a "default" function accepted by the
    python :py:mod:`json` module Encoder classes, valid for
    :class:`~obspy.core.event.Event` objects.

    Example
    -------
    >>> import json
    >>> from obspy import read_events
    >>> from obspy.io.json.default import Default
    >>> c = read_events()
    >>> d = Default(omit_nulls=False)
    >>> s = json.dumps(c, default=d)

    """
    from __future__ import (absolute_import, division, print_function,
                            unicode_literals)
    from future.builtins import *  # NOQA

    from obspy import UTCDateTime
    from obspy.core.event import Catalog, ResourceIdentifier
    from obspy.core.util import AttribDict

    class Default(object):
        """
        Class to create a "default" function for the
        :py:func:`json.dump`/:py:func:`json.dumps` functions
        which is passed to the JSONEncoder.

        """
        _catalog_attrib = ('events', 'comments', 'description', 'creation_info',
                           'resource_id')

        OMIT_NULLS = None
        TIME_FORMAT = None

        def __init__(self, omit_nulls=True, time_format=None):
            """
            Create a "default" function for JSONEncoder for ObsPy objects

            :param bool omit_nulls: Leave out any null or empty values (True)
            :param str time_format: Format string passed to strftime (None)

            """
            # Allows customization of the function
            self.OMIT_NULLS = omit_nulls
            self.TIME_FORMAT = time_format

        def __call__(self, obj):
            """
            Deal with :class:`~obspy.core.event.Event` objects in JSON Encoder

            This function can be passed to the json module's
            `default` keyword parameter

            """
            # Most event objects have dict methods, construct a dict
            # and deal with special cases that don't
            if isinstance(obj, AttribDict):
                # Map to a serializable dict
                # Leave out nulls, empty strings, list, dicts, except for numbers
                if self.OMIT_NULLS:
                    return {k: v for k, v in obj.items() if v or v == 0}
                else:
                    return {k: v for k, v in obj.items()}
            elif isinstance(obj, Catalog):
                # Catalog isn't a dict
                return {k: getattr(obj, k)
                        for k in self._catalog_attrib if getattr(obj, k)}
            elif isinstance(obj, UTCDateTime):
                if self.TIME_FORMAT is None:
                    return str(obj)
                else:
                    return obj.strftime(self.TIME_FORMAT)
            elif isinstance(obj, ResourceIdentifier):
                # Always want ID as a string
                return str(obj)
            else:
                return None

### Thank you!

We would like to thank our contributors, whose efforts make this software what it is. These people have helped by writing code and documentation, and by testing. They have created and maintained this product, its associated libraries and applications, our build tools and our web sites.

#### Contributors

- Ackerley, Nick
- Allgeyer, Sebastien
- Ammon, Charles J.
- Antunes, Emanuel
- Arnarsson, Ólafur St.
- Bank, Markus
- Barsch, Robert
- Behr, Yannik
- Bernardi, Fabrizio
- Bernauer, Felix
- Bes de Berc, Maxime
- Beyreuther, Moritz
- Boltz, Shawn
- Bonaimé, Sébastien
- Carothers, Lloyd
- Chamberlain, Calum
- Chambers, Derrick
- Chen, Zhao
- Clark, Adam
- Danecek, Peter
- Egdorf, Sven
- Engels, Fabian
- Ermert, Laura
- Eulenfeld, Tom

- Fabbri, Tommaso
- Falco, Nicholas
- Fee, Jeremy
- Grellier, Clément
- Grunberg, Marc
- Hammer, Conny
- Heimann, Sebastian
- Heiniger, Lukas
- Hope, Gaute
- Igel, Heiner
- Inza, Adolfo
- Isken, Marius
- Ketchum, David
- Koymans, Mathijs
- Kremers, Simon
- Kress, Victor
- Krieger, Lars
- Krischer, Lion
- Kula, Damian
- Käufl, Paul
- Köhler, Andreas
- Lecocq, Thomas
- Leeman, John
- Legovini, Paride

- Lesage, Philippe
- Li, Yulin
- Lomax, Anthony
- Lopes, Rui L.
- MacCarthy, Jonathan
- Maggi, Alessia
- Martin, Henri
- Medlin, Andrew
- Megies, Tobias
- Meschede, Matthias
- Michelini, Alberto
- Miller, Nathaniel C.
- Morgenstern, Bernhard
- Nof, Ran Novitsky
- Panning, Mark P.
- Parker, Tom
- Pestourie, Romain
- Rapagnani, Giovanni
- Reyes, Celso
- Ringler, Adam
- Rothenhäusler, Nicolas
- Russo, Emiliano
- Sales de Andrade, Elliott

- Satriano, Claudio
- Saul, Joachim
- Scheingraber, Chris
- Schneider, Simon
- Sippl, Christian
- Snoke, Arthur
- Stange, Stefan
- Stähler, Simon C.
- Sullivan, Benjamin
- Tian, Dongdong
- Trabant, Chad
- Trani, Luca
- Uieda, Leonardo
- Walker, Andrew
- Walther, Marcus
- Wassermann, Joachim
- Williams, Mark C.
- Winkelman, Andrew
- Zaccarelli, Riccardo
- Zad, Seyed Kasra Hosseini
- Zhu, Lijun
- van Driel, Martin
- van Wijk, Kasper

#### Funds

ObsPy was partially funded by the

- German Science Foundation (DFG) via grant DFG IG 16/9-1
- German Ministry for Education and Research (BMBF), GEOTECHNOLOGIEN grant 03G0646H.
- NERA project (Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation) under the European Community's Seventh Framework Programme (FP7/2007-2013) grant agreement n° 262330
- Leibniz Institute for Applied Geophysics (LIAG)
- VERCE EU-FP7 project (no. 283543)