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iso_metadata_parser.py
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iso_metadata_parser.py
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""" A module to contain utility ISO-19115 metadata parsing helpers """
import six
from collections import OrderedDict
from copy import deepcopy
from frozendict import frozendict, FrozenOrderedDict
from parserutils.collections import filter_empty, reduce_value, wrap_value
from parserutils.elements import get_element_name, get_element_text, get_elements_text
from parserutils.elements import get_elements, get_remote_element, insert_element, remove_element
from parserutils.elements import XPATH_DELIM
from gis_metadata.exceptions import InvalidContent
from gis_metadata.metadata_parser import MetadataParser
from gis_metadata.utils import DATE_TYPE, DATE_TYPE_SINGLE, DATE_TYPE_MULTIPLE
from gis_metadata.utils import DATE_TYPE_RANGE, DATE_TYPE_RANGE_BEGIN, DATE_TYPE_RANGE_END
from gis_metadata.utils import ATTRIBUTES
from gis_metadata.utils import CONTACTS
from gis_metadata.utils import BOUNDING_BOX
from gis_metadata.utils import DATES
from gis_metadata.utils import DIGITAL_FORMS
from gis_metadata.utils import KEYWORDS_PLACE, KEYWORDS_STRATUM, KEYWORDS_TEMPORAL, KEYWORDS_THEME
from gis_metadata.utils import LARGER_WORKS
from gis_metadata.utils import PROCESS_STEPS
from gis_metadata.utils import RASTER_DIMS, RASTER_INFO
from gis_metadata.utils import COMPLEX_DEFINITIONS, ParserProperty
from gis_metadata.utils import format_xpaths, get_default_for_complex, get_default_for_complex_sub
from gis_metadata.utils import parse_complex_list, parse_property, update_complex_list, update_property
iteritems = getattr(six, 'iteritems')
string_types = getattr(six, 'string_types')
six_moves = getattr(six, 'moves')
xrange = getattr(six_moves, 'xrange')
ISO_ROOTS = ('MD_Metadata', 'MI_Metadata')
KEYWORD_PROPS = (KEYWORDS_PLACE, KEYWORDS_STRATUM, KEYWORDS_TEMPORAL, KEYWORDS_THEME)
KEYWORD_TYPES = frozendict({
KEYWORDS_PLACE: 'place',
KEYWORDS_STRATUM: 'stratum',
KEYWORDS_TEMPORAL: 'temporal',
KEYWORDS_THEME: 'theme'
})
# For appending digital form content to ISO distribution format specs
ISO_DIGITAL_FORMS_DELIM = '@------------------------------@'
# Define backup locations for attribute sub-properties and dimension type property
ISO_DEFINITIONS = dict({k: dict(v) for k, v in iteritems(COMPLEX_DEFINITIONS)})
ISO_DEFINITIONS[ATTRIBUTES].update({
'_definition_source': '{_definition_src}',
'__definition_source': '{__definition_src}',
'___definition_source': '{___definition_src}'
})
ISO_DEFINITIONS[RASTER_DIMS]['_type'] = '{_type}'
ISO_DEFINITIONS = frozendict({k: frozendict(v) for k, v in iteritems(ISO_DEFINITIONS)})
ISO_TAG_ROOTS = OrderedDict((
# First process private dependency tags (order enforced by key sorting)
('_content_coverage', 'contentInfo/MD_CoverageDescription'),
('_dataqual', 'dataQualityInfo/DQ_DataQuality'),
('_dataqual_lineage', '{_dataqual}/lineage/LI_Lineage'),
('_dataqual_report', '{_dataqual}/report'),
('_distinfo', 'distributionInfo/MD_Distribution'),
('_distinfo_dist', '{_distinfo}/distributor/MD_Distributor'),
('_distinfo_proc', '{_distinfo_dist}/distributionOrderProcess/MD_StandardOrderProcess'),
('_distinfo_resp', '{_distinfo_dist}/distributorContact/CI_ResponsibleParty'),
('_distinfo_resp_contact', '{_distinfo_resp}/contactInfo/CI_Contact'),
('_distinfo_rsrc', '{_distinfo}/transferOptions/MD_DigitalTransferOptions/onLine/CI_OnlineResource'),
('_idinfo', 'identificationInfo/MD_DataIdentification'),
('_idinfo_aggregate', '{_idinfo}/aggregationInfo/MD_AggregateInformation'),
('_idinfo_aggregate_citation', '{_idinfo_aggregate}/aggregateDataSetName/CI_Citation'),
('_idinfo_aggregate_contact', '{_idinfo_aggregate_citation}/citedResponsibleParty/CI_ResponsibleParty'),
('_idinfo_citation', '{_idinfo}/citation/CI_Citation'),
('_idinfo_citresp', '{_idinfo_citation}/citedResponsibleParty/CI_ResponsibleParty'),
('_idinfo_extent', '{_idinfo}/extent/EX_Extent'),
('_idinfo_keywords', '{_idinfo}/descriptiveKeywords/MD_Keywords'),
('_idinfo_resp', '{_idinfo}/pointOfContact/CI_ResponsibleParty'),
('_idinfo_resp_contact', '{_idinfo_resp}/contactInfo/CI_Contact'),
('_srinfo_grid_rep', 'spatialRepresentationInfo/MD_GridSpatialRepresentation'),
('_srinfo_grid_dim', '{_srinfo_grid_rep}/axisDimensionProperties/MD_Dimension'),
# Supported in separate file ISO-19110: FC_FeatureCatalog
('_attr_root', 'FC_FeatureCatalogue'),
('_attr_base', 'featureType/FC_FeatureType/carrierOfCharacteristics/FC_FeatureAttribute'),
('_attr_def', '{_attr_base}/definitionReference/FC_DefinitionReference/definitionSource/FC_DefinitionSource'),
('_attr_src', '{_attr_def}/source/CI_Citation/citedResponsibleParty/CI_ResponsibleParty'),
# References to separate file ISO-19110 from: MD_Metadata
('_attr_citation', 'contentInfo/MD_FeatureCatalogueDescription/featureCatalogueCitation'),
('_attr_contact', '{_attr_citation}/CI_Citation/citedResponsibleParty/CI_ResponsibleParty/contactInfo/CI_Contact'),
('_attr_contact_url', '{_attr_contact}/onlineResource/CI_OnlineResource/linkage/URL')
))
# Two passes required because of self references within roots dict
ISO_TAG_ROOTS.update(format_xpaths(ISO_TAG_ROOTS, **ISO_TAG_ROOTS))
ISO_TAG_ROOTS.update(format_xpaths(ISO_TAG_ROOTS, **ISO_TAG_ROOTS))
ISO_TAG_ROOTS = FrozenOrderedDict(ISO_TAG_ROOTS)
ISO_TAG_FORMATS = {
# Property-specific xpath roots: the base from which each element repeats
'_attribute_accuracy_root': '{_dataqual_report}',
'_attributes_root': 'featureType/FC_FeatureType/carrierOfCharacteristics',
'_bounding_box_root': '{_idinfo_extent}/geographicElement',
'_contacts_root': '{_idinfo}/pointOfContact',
'_dataset_completeness_root': '{_dataqual_report}',
'_dates_root': '{_idinfo_extent}/temporalElement',
'_digital_forms_root': '{_distinfo}/distributionFormat',
'_dist_liability_root': '{_idinfo}/resourceConstraints',
'_transfer_options_root': '{_distinfo}/transferOptions/MD_DigitalTransferOptions/onLine',
'_keywords_root': '{_idinfo}/descriptiveKeywords',
'_larger_works_root': '{_idinfo_aggregate_citation}',
'_process_steps_root': '{_dataqual_lineage}/processStep',
'_raster_info_root': '{_srinfo_grid_rep}/axisDimensionProperties',
'_use_constraints_root': '{_idinfo}/resourceConstraints',
# Then process public dependent tags
'title': '{_idinfo_citation}/title/CharacterString',
'abstract': '{_idinfo}/abstract/CharacterString',
'purpose': '{_idinfo}/purpose/CharacterString',
'supplementary_info': '{_idinfo}/supplementalInformation/CharacterString',
'online_linkages': '{_idinfo_citresp}/contactInfo/CI_Contact/onlineResource/CI_OnlineResource/linkage/URL',
'originators': '{_idinfo_citresp}/organisationName/CharacterString',
'publish_date': '{_idinfo_citation}/date/CI_Date/date/Date',
'publish_date_type': '{_idinfo_citation}/date/CI_Date/dateType/CI_DateTypeCode',
'data_credits': '{_idinfo}/credit/CharacterString',
CONTACTS: '{_idinfo_resp}/{{ct_path}}',
'dist_contact_org': '{_distinfo_resp}/organisationName/CharacterString',
'dist_contact_person': '{_distinfo_resp}/individualName/CharacterString',
'dist_address_type': '{_distinfo_resp_contact}/address/@type',
'dist_address': '{_distinfo_resp_contact}/address/CI_Address/deliveryPoint/CharacterString',
'dist_city': '{_distinfo_resp_contact}/address/CI_Address/city/CharacterString',
'dist_state': '{_distinfo_resp_contact}/address/CI_Address/administrativeArea/CharacterString',
'dist_postal': '{_distinfo_resp_contact}/address/CI_Address/postalCode/CharacterString',
'dist_country': '{_distinfo_resp_contact}/address/CI_Address/country/CharacterString',
'_dist_country': '{_distinfo_resp_contact}/address/CI_Address/country/Country', # If not in CharacterString
'dist_phone': '{_distinfo_resp_contact}/phone/CI_Telephone/voice/CharacterString',
'dist_email': '{_distinfo_resp_contact}/address/CI_Address/electronicMailAddress/CharacterString',
'dist_liability': '{_idinfo}/resourceConstraints/MD_LegalConstraints/otherConstraints/CharacterString',
'processing_fees': '{_distinfo_proc}/fees/CharacterString',
'processing_instrs': '{_distinfo_proc}/orderingInstructions/CharacterString',
'resource_desc': '{_idinfo}/resourceSpecificUsage/MD_Usage/specificUsage/CharacterString',
'tech_prerequisites': '{_idinfo}/environmentDescription/CharacterString',
ATTRIBUTES: '{_attr_base}/{{ad_path}}',
'_attributes_file': '{_attr_citation}/@href',
'__attributes_file': '{_attr_contact_url}', # If not in above: "_attr_citation/@href"
'attribute_accuracy': '{_dataqual_report}/DQ_QuantitativeAttributeAccuracy/measureDescription/CharacterString',
BOUNDING_BOX: '{_idinfo_extent}/geographicElement/EX_GeographicBoundingBox/{{bbox_path}}',
'dataset_completeness': '{_dataqual_report}/DQ_CompletenessOmission/measureDescription/CharacterString',
DIGITAL_FORMS: '{_distinfo}/distributionFormat/MD_Format/{{df_path}}',
'_access_desc': '{_distinfo_rsrc}/description/CharacterString',
'_access_instrs': '{_distinfo_rsrc}/protocol/CharacterString',
'_network_resource': '{_distinfo_rsrc}/linkage/URL',
PROCESS_STEPS: '{_dataqual_lineage}/processStep/LI_ProcessStep/{{ps_path}}',
LARGER_WORKS: '{_idinfo_aggregate_citation}/{{lw_path}}',
'_lw_citation': '{_idinfo_aggregate_contact}/{{lw_path}}',
'_lw_collective': '{_idinfo_aggregate_citation}/collectiveTitle/CharacterString',
'_lw_contact': '{_idinfo_aggregate_contact}/contactInfo/CI_Contact/{{lw_path}}',
'_lw_linkage': '{_idinfo_aggregate_contact}/contactInfo/CI_Contact/onlineResource/CI_OnlineResource/{{lw_path}}',
RASTER_INFO: '{_srinfo_grid_dim}/{{ri_path}}',
'_ri_num_dims': '{_srinfo_grid_rep}/numberOfDimensions/Integer',
'other_citation_info': '{_idinfo_citation}/otherCitationDetails/CharacterString',
'use_constraints': '{_idinfo}/resourceConstraints/MD_Constraints/useLimitation/CharacterString',
DATES: '{_idinfo_extent}/temporalElement/EX_TemporalExtent/extent/{{type_path}}',
KEYWORDS_PLACE: '{_idinfo_keywords}/keyword/CharacterString',
KEYWORDS_STRATUM: '{_idinfo_keywords}/keyword/CharacterString',
KEYWORDS_TEMPORAL: '{_idinfo_keywords}/keyword/CharacterString',
KEYWORDS_THEME: '{_idinfo_keywords}/keyword/CharacterString'
}
# Apply XPATH root formats to the basic data map formats
ISO_TAG_FORMATS.update(ISO_TAG_ROOTS)
ISO_TAG_FORMATS.update(format_xpaths(ISO_TAG_FORMATS, **ISO_TAG_ROOTS))
ISO_TAG_FORMATS = frozendict(ISO_TAG_FORMATS)
ISO_TAG_PRIMITIVES = frozenset({
'Binary', 'Boolean', 'CharacterString',
'Date', 'DateTime', 'timePosition',
'Decimal', 'Integer', 'Real', 'RecordType',
'CI_DateTypeCode', 'MD_KeywordTypeCode', 'URL'
})
class IsoParser(MetadataParser):
""" A class to parse metadata files conforming to the ISO-19115 standard """
def _init_data_map(self):
""" OVERRIDDEN: Initialize required ISO-19115 data map with XPATHS and specialized functions """
if self._data_map is not None:
return # Initiation happens once
# Parse and validate the ISO metadata root
if self._xml_tree is None:
iso_root = ISO_ROOTS[0]
else:
iso_root = get_element_name(self._xml_tree)
if iso_root not in ISO_ROOTS:
raise InvalidContent('Invalid XML root for ISO-19115 standard: {root}', root=iso_root)
iso_data_map = {'_root': iso_root}
iso_data_map.update(ISO_TAG_ROOTS)
iso_data_map.update(ISO_TAG_FORMATS)
iso_data_structures = {}
# Capture and format complex XPATHs
ad_format = iso_data_map[ATTRIBUTES]
ft_source = iso_data_map['_attr_src'].replace('/carrierOfCharacteristics/FC_FeatureAttribute', '')
iso_data_structures[ATTRIBUTES] = format_xpaths(
ISO_DEFINITIONS[ATTRIBUTES],
label=ad_format.format(ad_path='memberName/LocalName'),
aliases=ad_format.format(ad_path='aliases/LocalName'), # Not in spec
definition=ad_format.format(ad_path='definition/CharacterString'),
# First try to populate attribute definition source from FC_FeatureAttribute
definition_src=iso_data_map['_attr_src'] + '/organisationName/CharacterString',
_definition_src=iso_data_map['_attr_src'] + '/individualName/CharacterString',
# Then assume feature type source is the same as attribute: populate from FC_FeatureType
__definition_src=ft_source + '/organisationName/CharacterString',
___definition_src=ft_source + '/individualName/CharacterString'
)
bb_format = iso_data_map[BOUNDING_BOX]
iso_data_structures[BOUNDING_BOX] = format_xpaths(
ISO_DEFINITIONS[BOUNDING_BOX],
east=bb_format.format(bbox_path='eastBoundLongitude/Decimal'),
south=bb_format.format(bbox_path='southBoundLatitude/Decimal'),
west=bb_format.format(bbox_path='westBoundLongitude/Decimal'),
north=bb_format.format(bbox_path='northBoundLatitude/Decimal')
)
ct_format = iso_data_map[CONTACTS]
iso_data_structures[CONTACTS] = format_xpaths(
ISO_DEFINITIONS[CONTACTS],
name=ct_format.format(ct_path='individualName/CharacterString'),
organization=ct_format.format(ct_path='organisationName/CharacterString'),
position=ct_format.format(ct_path='positionName/CharacterString'),
email=ct_format.format(
ct_path='contactInfo/CI_Contact/address/CI_Address/electronicMailAddress/CharacterString'
)
)
dt_format = iso_data_map[DATES]
iso_data_structures[DATES] = {
DATE_TYPE_MULTIPLE: dt_format.format(type_path='TimeInstant/timePosition'),
DATE_TYPE_RANGE_BEGIN: dt_format.format(type_path='TimePeriod/begin/TimeInstant/timePosition'),
DATE_TYPE_RANGE_END: dt_format.format(type_path='TimePeriod/end/TimeInstant/timePosition'),
DATE_TYPE_SINGLE: dt_format.format(type_path='TimeInstant/timePosition') # Same as multiple
}
iso_data_structures[DATES][DATE_TYPE_RANGE] = [
iso_data_structures[DATES][DATE_TYPE_RANGE_BEGIN],
iso_data_structures[DATES][DATE_TYPE_RANGE_END]
]
df_format = iso_data_map[DIGITAL_FORMS]
iso_data_structures[DIGITAL_FORMS] = format_xpaths(
ISO_DEFINITIONS[DIGITAL_FORMS],
name=df_format.format(df_path='name/CharacterString'),
content='', # Not supported in ISO-19115 (appending to spec)
decompression=df_format.format(df_path='fileDecompressionTechnique/CharacterString'),
version=df_format.format(df_path='version/CharacterString'),
specification=df_format.format(df_path='specification/CharacterString'),
access_desc=iso_data_map['_access_desc'],
access_instrs=iso_data_map['_access_instrs'],
network_resource=iso_data_map['_network_resource']
)
keywords_structure = {
'keyword_root': 'MD_Keywords/keyword',
'keyword_type': 'MD_Keywords/type/MD_KeywordTypeCode',
'keyword': 'MD_Keywords/keyword/CharacterString'
}
for keyword_prop in KEYWORD_PROPS:
iso_data_structures[keyword_prop] = deepcopy(keywords_structure)
lw_format = iso_data_map[LARGER_WORKS]
iso_data_structures[LARGER_WORKS] = format_xpaths(
ISO_DEFINITIONS[LARGER_WORKS],
title=lw_format.format(lw_path='title/CharacterString'),
edition=lw_format.format(lw_path='edition/CharacterString'),
origin=iso_data_map['_lw_citation'].format(lw_path='individualName/CharacterString'),
online_linkage=iso_data_map['_lw_linkage'].format(lw_path='linkage/URL'),
other_citation=lw_format.format(lw_path='otherCitationDetails/CharacterString'),
date=lw_format.format(lw_path='editionDate/Date'),
place=iso_data_map['_lw_contact'].format(lw_path='address/CI_Address/city/CharacterString'),
info=iso_data_map['_lw_citation'].format(lw_path='organisationName/CharacterString')
)
ps_format = iso_data_map[PROCESS_STEPS]
iso_data_structures[PROCESS_STEPS] = format_xpaths(
ISO_DEFINITIONS[PROCESS_STEPS],
description=ps_format.format(ps_path='description/CharacterString'),
date=ps_format.format(ps_path='dateTime/DateTime'),
sources=ps_format.format(
ps_path='source/LI_Source/sourceCitation/CI_Citation/alternateTitle/CharacterString'
)
)
ri_format = iso_data_map[RASTER_INFO]
iso_data_structures[RASTER_INFO] = format_xpaths(
ISO_DEFINITIONS[RASTER_DIMS],
type=ri_format.format(ri_path='dimensionName/MD_DimensionNameTypeCode'),
_type=ri_format.format(ri_path='dimensionName/MD_DimensionNameTypeCode/@codeListValue'),
size=ri_format.format(ri_path='dimensionSize/Integer'),
value=ri_format.format(ri_path='resolution/Measure'),
units=ri_format.format(ri_path='resolution/Measure/@uom')
)
# Assign XPATHS and gis_metadata.utils.ParserProperties to data map
for prop, xpath in iteritems(dict(iso_data_map)):
if prop == ATTRIBUTES:
iso_data_map[prop] = ParserProperty(self._parse_attribute_details, self._update_attribute_details)
elif prop in (CONTACTS, PROCESS_STEPS):
iso_data_map[prop] = ParserProperty(self._parse_complex_list, self._update_complex_list)
elif prop in (BOUNDING_BOX, LARGER_WORKS):
iso_data_map[prop] = ParserProperty(self._parse_complex, self._update_complex)
elif prop == DATES:
iso_data_map[prop] = ParserProperty(self._parse_dates, self._update_dates)
elif prop == DIGITAL_FORMS:
iso_data_map[prop] = ParserProperty(self._parse_digital_forms, self._update_digital_forms)
elif prop in KEYWORD_PROPS:
iso_data_map[prop] = ParserProperty(self._parse_keywords, self._update_keywords)
elif prop == RASTER_INFO:
iso_data_map[prop] = ParserProperty(self._parse_raster_info, self._update_raster_info)
else:
iso_data_map[prop] = xpath
self._data_map = iso_data_map
self._data_structures = iso_data_structures
def _parse_attribute_details(self, prop=ATTRIBUTES):
""" Concatenates a list of Attribute Details data structures parsed from a remote file """
parsed_attributes = self._parse_attribute_details_file(prop)
if parsed_attributes is None:
# If not in the (official) remote location, try the tree itself
parsed_attributes = self._parse_complex_list(prop)
for attribute in (a for a in parsed_attributes if not a['aliases']):
# Aliases are not in ISO standard: default to label
attribute['aliases'] = attribute['label']
return get_default_for_complex(prop, parsed_attributes)
def _parse_attribute_details_file(self, prop=ATTRIBUTES):
""" Concatenates a list of Attribute Details data structures parsed from a remote file """
# Parse content from remote file URL, which may be stored in one of two places:
# Starting at: contentInfo/MD_FeatureCatalogueDescription/featureCatalogueCitation
# ATTRIBUTE: href
# ELEMENT TEXT: CI_Citation/.../CI_Contact/onlineResource/CI_OnlineResource/linkage
self._attr_details_file_url = parse_property(
self._xml_tree, None, self._data_map, '_attributes_file'
)
if not self._attr_details_file_url:
self._attr_details_file_url = None
return None
try:
tree_to_parse = get_remote_element(self._attr_details_file_url)
except Exception:
self._attr_details_file_url = None
return None
xpath_map = self._data_structures[ATTRIBUTES]
xpath_root = self._get_xroot_for(prop)
return parse_complex_list(tree_to_parse, xpath_root, xpath_map, prop)
def _parse_digital_forms(self, prop=DIGITAL_FORMS):
""" Concatenates a list of Digital Form data structures parsed from the metadata """
xpath_map = self._data_structures[prop]
# Parse base digital form fields: 'name', 'content', 'decompression', 'version', 'specification'
xpath_root = self._data_map['_digital_forms_root']
digital_forms = parse_complex_list(self._xml_tree, xpath_root, xpath_map, prop)
# Parse digital form transfer option fields: 'access_desc', 'access_instrs', 'network_resource'
xpath_root = self._data_map['_transfer_options_root']
transfer_opts = parse_complex_list(self._xml_tree, xpath_root, xpath_map, prop)
# Split out digital form content that has been appended to specifications
content_delim = ISO_DIGITAL_FORMS_DELIM
for digital_form in digital_forms:
specs = reduce_value(digital_form['specification'])
specs = specs.splitlines() if isinstance(specs, string_types) else specs
specifications = wrap_value(s.strip() for s in specs)
digital_form['content'] = []
digital_form['specification'] = []
has_content = False
# For each specification, insert delim before appending content
for spec in specifications:
has_content = has_content or spec == content_delim
if not has_content:
digital_form['specification'].append(spec)
elif spec != content_delim:
digital_form['content'].append(spec)
# Reduce spec and content to single string values if possible
for form_prop in ('content', 'specification'):
digital_form[form_prop] = reduce_value(filter_empty(digital_form[form_prop], u''))
# Combine digital forms and transfer options into a single complex struct
df_len = len(digital_forms)
to_len = len(transfer_opts)
parsed_forms = []
for idx in xrange(0, max(df_len, to_len)):
digital_form = {}.fromkeys(ISO_DEFINITIONS[prop], u'')
if idx < df_len:
digital_form.update(i for i in digital_forms[idx].items() if i[1])
if idx < to_len:
digital_form.update(i for i in transfer_opts[idx].items() if i[1])
if any(digital_form.values()):
parsed_forms.append(digital_form)
return get_default_for_complex(prop, parsed_forms)
def _parse_keywords(self, prop):
""" Parse type-specific keywords from the metadata: Theme or Place """
keywords = []
if prop in KEYWORD_PROPS:
xpath_root = self._data_map['_keywords_root']
xpath_map = self._data_structures[prop]
xtype = xpath_map['keyword_type']
xpath = xpath_map['keyword']
ktype = KEYWORD_TYPES[prop]
for element in get_elements(self._xml_tree, xpath_root):
if get_element_text(element, xtype).lower() == ktype.lower():
keywords.extend(get_elements_text(element, xpath))
return keywords
def _parse_raster_info(self, prop=RASTER_INFO):
""" Collapses multiple dimensions into a single raster_info complex struct """
raster_info = {}.fromkeys(ISO_DEFINITIONS[prop], u'')
# Ensure conversion of lists to newlines is in place
raster_info['dimensions'] = get_default_for_complex_sub(
prop=prop,
subprop='dimensions',
value=parse_property(self._xml_tree, None, self._data_map, '_ri_num_dims'),
xpath=self._data_map['_ri_num_dims']
)
xpath_root = self._get_xroot_for(prop)
xpath_map = self._data_structures[prop]
for dimension in parse_complex_list(self._xml_tree, xpath_root, xpath_map, RASTER_DIMS):
dimension_type = dimension['type'].lower()
if dimension_type == 'vertical':
raster_info['vertical_count'] = dimension['size']
elif dimension_type == 'column':
raster_info['column_count'] = dimension['size']
raster_info['x_resolution'] = u' '.join(dimension[k] for k in ['value', 'units']).strip()
elif dimension_type == 'row':
raster_info['row_count'] = dimension['size']
raster_info['y_resolution'] = u' '.join(dimension[k] for k in ['value', 'units']).strip()
return raster_info if any(raster_info[k] for k in raster_info) else {}
def _update_attribute_details(self, **update_props):
""" Update operation for ISO Attribute Details metadata: write to "MD_Metadata/featureType" """
tree_to_update = update_props['tree_to_update']
xpath = self._data_map['_attr_citation']
# Cannot write to remote file: remove the featureCatalogueCitation element
self._attr_details_file_url = None
remove_element(tree_to_update, xpath, True)
return self._update_complex_list(**update_props)
def _update_dates(self, **update_props):
"""
Update operation for ISO Dates metadata
:see: gis_metadata.utils.COMPLEX_DEFINITIONS[DATES]
"""
tree_to_update = update_props['tree_to_update']
xpath_root = self._data_map['_dates_root']
if self.dates:
date_type = self.dates[DATE_TYPE]
# First remove all date info from common root
remove_element(tree_to_update, xpath_root)
if date_type == DATE_TYPE_MULTIPLE:
xpath_root += '/TimeInstant'
elif date_type == DATE_TYPE_RANGE:
xpath_root += '/TimePeriod'
return super(IsoParser, self)._update_dates(xpath_root, **update_props)
def _update_digital_forms(self, **update_props):
"""
Update operation for ISO Digital Forms metadata
:see: gis_metadata.utils.COMPLEX_DEFINITIONS[DIGITAL_FORMS]
"""
digital_forms = wrap_value(update_props['values'])
# Update all Digital Form properties: distributionFormat*
xpath_map = self._data_structures[update_props['prop']]
dist_format_props = ('name', 'decompression', 'version', 'specification')
dist_format_xroot = self._data_map['_digital_forms_root']
dist_format_xmap = {prop: xpath_map[prop] for prop in dist_format_props}
dist_formats = []
for digital_form in digital_forms:
dist_format = {prop: digital_form[prop] for prop in dist_format_props}
if digital_form.get('content'):
dist_spec = wrap_value(digital_form.get('specification'))
dist_spec.append(ISO_DIGITAL_FORMS_DELIM)
dist_spec.extend(wrap_value(digital_form['content']))
dist_format['specification'] = dist_spec
dist_formats.append(dist_format)
update_props['values'] = dist_formats
dist_formats = update_complex_list(
xpath_root=dist_format_xroot, xpath_map=dist_format_xmap, **update_props
)
# Update all Network Resources: transferOptions+
trans_option_props = ('access_desc', 'access_instrs', 'network_resource')
trans_option_xroot = self._data_map['_transfer_options_root']
trans_option_xmap = {prop: self._data_map['_' + prop] for prop in trans_option_props}
trans_options = []
for digital_form in digital_forms:
trans_options.append({prop: digital_form[prop] for prop in trans_option_props})
update_props['values'] = trans_options
trans_options = update_complex_list(
xpath_root=trans_option_xroot, xpath_map=trans_option_xmap, **update_props
)
return {
'distribution_formats': dist_formats,
'transfer_options': trans_options
}
def _update_keywords(self, **update_props):
""" Update operation for ISO type-specific Keywords metadata: Theme or Place """
tree_to_update = update_props['tree_to_update']
prop = update_props['prop']
values = update_props['values']
keywords = []
if prop in KEYWORD_PROPS:
xpath_root = self._data_map['_keywords_root']
xpath_map = self._data_structures[prop]
xtype = xpath_map['keyword_type']
xroot = xpath_map['keyword_root']
xpath = xpath_map['keyword']
ktype = KEYWORD_TYPES[prop]
# Remove descriptiveKeyword nodes according to type
for element in get_elements(tree_to_update, xpath_root):
if get_element_text(element, xtype).lower() == ktype.lower():
remove_element(tree_to_update, xpath_root)
element = insert_element(tree_to_update, 0, xpath_root)
insert_element(element, 0, xtype, ktype) # Add the type node
keywords.extend(update_property(element, xroot, xpath, prop, values))
return keywords
def _update_raster_info(self, **update_props):
""" Derives multiple dimensions from a single raster_info complex struct """
tree_to_update = update_props['tree_to_update']
prop = update_props['prop']
values = update_props.pop('values')
# Update number of dimensions at raster_info root (applies to all dimensions below)
xroot, xpath = None, self._data_map['_ri_num_dims']
raster_info = [update_property(tree_to_update, xroot, xpath, prop, values.get('dimensions', u''))]
# Derive vertical, longitude, and latitude dimensions from raster_info
xpath_root = self._get_xroot_for(prop)
xpath_map = self._data_structures[prop]
v_dimension = {}
if values.get('vertical_count'):
v_dimension = v_dimension.fromkeys(xpath_map, u'')
v_dimension['type'] = 'vertical'
v_dimension['size'] = values.get('vertical_count', u'')
x_dimension = {}
if values.get('column_count') or values.get('x_resolution'):
x_dimension = x_dimension.fromkeys(xpath_map, u'')
x_dimension['type'] = 'column'
x_dimension['size'] = values.get('column_count', u'')
x_dimension['value'] = values.get('x_resolution', u'')
y_dimension = {}
if values.get('row_count') or values.get('y_resolution'):
y_dimension = y_dimension.fromkeys(xpath_map, u'')
y_dimension['type'] = 'row'
y_dimension['size'] = values.get('row_count', u'')
y_dimension['value'] = values.get('y_resolution', u'')
# Update derived dimensions as complex list, and append affected elements for return
update_props['prop'] = RASTER_DIMS
update_props['values'] = [v_dimension, x_dimension, y_dimension]
raster_info += update_complex_list(xpath_root=xpath_root, xpath_map=xpath_map, **update_props)
return raster_info
def update(self, use_template=False, **metadata_defaults):
""" OVERRIDDEN: Prevents writing multiple CharacterStrings per XPATH property """
self.validate()
tree_to_update = self._xml_tree if not use_template else self._get_template(**metadata_defaults)
supported_props = self._metadata_props
# Iterate over keys, and extract non-primitive root for all XPATHs
# xroot = identificationInfo/MD_DataIdentification/abstract/
# xpath = identificationInfo/MD_DataIdentification/abstract/CharacterString
#
# This prevents multiple primitive tags from being inserted under an element
for prop, xpath in iteritems(self._data_map):
if not prop.startswith('_') or prop.strip('_') in supported_props:
# Send only public or alternate properties
xroot = self._trim_xpath(xpath, prop)
values = getattr(self, prop, u'')
update_property(tree_to_update, xroot, xpath, prop, values, supported_props)
return tree_to_update
def _trim_xpath(self, xpath, prop):
""" Removes primitive type tags from an XPATH """
xroot = self._get_xroot_for(prop)
if xroot is None and isinstance(xpath, string_types):
xtags = xpath.split(XPATH_DELIM)
if xtags[-1] in ISO_TAG_PRIMITIVES:
xroot = XPATH_DELIM.join(xtags[:-1])
return xroot