VOSDatabase¶

class astroquery.vo_conesearch.vos_catalog.VOSDatabase(tree)[source]¶

Bases: astroquery.vo_conesearch.vos_catalog.VOSBase

A class to represent a collection of VOSCatalog.

Parameters

treeJSON tree

Raises

VOSError: If given tree does not have ‘catalogs’ key or catalog is invalid.

Attributes Summary

version

Database version number.

Methods Summary

`add_catalog`(name, cat[, allow_duplicate_url])	Add a catalog to database.
`add_catalog_by_url`(name, url, **kwargs)	Like `add_catalog()` but the catalog is created with only the given name and access URL.
`create_empty`()	Create an empty database of VO services.
`delete_catalog`(name)	Delete a catalog from database with given name.
`delete_catalog_by_url`(url)	Like `delete_catalog()` but using access URL.
`from_json`(filename, **kwargs)	Create a database of VO services from a JSON file.
`from_registry`(registry_url[, timeout])	Create a database of VO services from VO registry URL.
`get_catalog`(name)	Get one catalog of given name.
`get_catalog_by_url`(url)	Like `get_catalog()` but using access URL look-up.
`get_catalogs`()	Iterator to get all catalogs.
`get_catalogs_by_url`(url)	Like `get_catalogs()` but using access URL look-up.
`list_catalogs`([pattern, sort])	List catalog names.
`list_catalogs_by_url`([pattern, sort])	Like `list_catalogs()` but using access URL.
`merge`(other, **kwargs)	Merge two database together.
`to_json`(filename[, overwrite])	Write database content to a JSON file.

Attributes Documentation

version¶: Database version number.

Methods Documentation

add_catalog(name, cat, allow_duplicate_url=False)[source]¶

Add a catalog to database.

Parameters

namestr: Primary key for the catalog.
catVOSCatalog: Catalog to add.
allow_duplicate_urlbool: Allow catalog with duplicate access URL?

Raises

VOSError: Invalid catalog.
DuplicateCatalogName: Catalog with given name already exists.
DuplicateCatalogURL: Catalog with given access URL already exists.

add_catalog_by_url(name, url, **kwargs)[source]¶

Like add_catalog() but the catalog is created with only the given name and access URL.

Parameters

namestr: Primary key for the catalog.
urlstr: Access URL of the service. This is used to build queries.
kwargsdict: Keywords accepted by add_catalog().

classmethod create_empty()[source]¶

Create an empty database of VO services.

Empty database format:

{
    "__version__": 1,
    "catalogs" : {
    }
}

Returns

dbVOSDatabase: Empty database.

delete_catalog(name)[source]¶

Delete a catalog from database with given name.

Parameters

namestr: Primary key identifying the catalog.

Raises

MissingCatalog: If catalog is not found.

delete_catalog_by_url(url)[source]¶: Like delete_catalog() but using access URL. On multiple matches, all matches are deleted.

classmethod from_json(filename, **kwargs)[source]¶

Create a database of VO services from a JSON file.

Example JSON format for Cone Search:

{
    "__version__": 1,
    "catalogs" : {
        "My Cone Search": {
            "capabilityClass": "ConeSearch",
            "title": "My Cone Search",
            "url": "http://foo/cgi-bin/search?CAT=bar&",
            ...
        },
        "Another Cone Search": {
            ...
        }
    }
}

Parameters

filenamestr: JSON file.
kwargsdict: Keywords accepted by get_readable_fileobj().

Returns

dbVOSDatabase: Database from given file.

classmethod from_registry(registry_url, timeout=60, **kwargs)[source]¶

Create a database of VO services from VO registry URL.

This is described in detail in Building the Database from Registry, except for the validate_xxx keys that are added by the validator itself.

Parameters

registry_urlstr: URL of VO registry that returns a VO Table. For example, see astroquery.vo_conesearch.validator.conf.cs_mstr_list. Pedantic is automatically set to False for parsing.
timeoutnumber: Temporarily set astropy.utils.data.conf.remote_timeout to this value to avoid time out error while reading the entire registry.
kwargsdict: Keywords accepted by get_readable_fileobj().

Returns

dbVOSDatabase: Database from given registry.

Raises

VOSError: Invalid VO registry.

get_catalog(name)[source]¶

Get one catalog of given name.

Parameters

namestr: Primary key identifying the catalog.

Returns

objVOSCatalog

Raises

MissingCatalog: If catalog is not found.

get_catalog_by_url(url)[source]¶: Like get_catalog() but using access URL look-up. On multiple matches, only first match is returned.

get_catalogs()[source]¶: Iterator to get all catalogs.

get_catalogs_by_url(url)[source]¶: Like get_catalogs() but using access URL look-up.

list_catalogs(pattern=None, sort=True)[source]¶

List catalog names.

Parameters

patternstr or None: If given string is anywhere in a catalog name, it is considered a matching catalog. It accepts patterns as in fnmatch and is case-insensitive. By default, all catalogs are returned.
sortbool: Sort output in alphabetical order. If not sorted, the order depends on dictionary hashing. Default is True.

Returns

out_arrlist of str: List of catalog names.

list_catalogs_by_url(pattern=None, sort=True)[source]¶: Like list_catalogs() but using access URL.

merge(other, **kwargs)[source]¶

Merge two database together.

Parameters

otherVOSDatabase: The other database to merge.
kwargsdict: Keywords accepted by add_catalog().

Returns

dbVOSDatabase: Merged database.

Raises

VOSError: Invalid database or incompatible version.

to_json(filename, overwrite=False)[source]¶

Write database content to a JSON file.

Parameters

filenamestr: JSON file.
overwritebool: If True, overwrite the output file if it exists.

Raises

OSError: If the file exists and overwrite is False.

Navigation

VOSDatabase¶