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record.py
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Tue, Sep 3, 02:07

record.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2013 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
from operator import itemgetter
try:
from xml.etree import ElementTree as ET
except ImportError:
import elementtree.ElementTree as ET
from invenio.legacy.search_engine import get_record as get_record_original
from invenio.legacy.bibrecord import create_record as create_record_original, \
create_records as create_records_original
def parse_tag(tag):
tag_code = tag[0:3]
try:
ind1 = tag[3]
except IndexError:
ind1 = "%"
if ind1 == '_':
ind1 = ' '
try:
ind2 = tag[4]
except IndexError:
ind2 = "%"
if ind2 == '_':
ind2 = ' '
try:
subfield_code = tag[5]
except IndexError:
subfield_code = None
return tag_code, ind1, ind2, subfield_code
def convert_record(bibrecord):
def create_control_field(inst):
return BibRecordControlField(inst[3].decode('utf-8'))
def create_field(inst):
subfields = [BibRecordSubField(code, value.decode('utf-8'))
for code, value in inst[0]]
return BibRecordField(ind1=inst[1], ind2=inst[2], subfields=subfields)
record = BibRecord()
for tag, instances in bibrecord.iteritems():
if tag.startswith('00'):
record[tag] = [create_control_field(inst) for inst in instances]
else:
record[tag] = [create_field(inst) for inst in instances]
return record
def get_record(recid):
"""Fetch record from the database and loads it into a bibrecord"""
record = get_record_original(recid)
return convert_record(record)
def create_record(xml):
record = create_record_original(xml)[0]
return convert_record(record)
def create_records(xml):
return [convert_record(rec[0]) for rec in create_records_original(xml)]
def print_records(records, encoding='utf-8'):
root = ET.Element('collection',
{'xmlns': 'http://www.loc.gov/MARC21/slim'})
for record in records:
root.append(record._to_element_tree())
return ET.tostring(root, encoding=encoding)
class BibRecord(object):
def __init__(self, recid=None):
"""Create an empty BibRecord object
If you specify the recid, the record will have a 001 field set
to the value of recid.
"""
self.record = {}
if recid:
self.record['001'] = [BibRecordControlField(str(recid))]
def __setitem__(self, tag, fields):
self.record[tag] = fields
def __getitem__(self, tag):
return self.find_fields(tag)
def __delitem__(self, tag):
assert len(tag) >= 3
if len(tag) == 3:
# Case '100', it's easy to delete all fields
del self.record[tag]
else:
tag_code, ind1, ind2, subfield_code = parse_tag(tag)
if subfield_code is None:
# Case '100__', we filter out all fields that match
# the indicators
self.record[tag_code] = [f for f in self.record[tag_code]
if ind1 != '%' and f.ind1 != ind1
or ind2 != '%' and f.ind2 != ind2]
else:
# Case '100__a', we filter out matching subfields
for field in self.find_fields(tag):
field.subfields = [s for s in field.subfields
if s.code != subfield_code]
# Cleanup empty fields
self.record[tag_code] = [f for f in self.record[tag_code]
if f.subfields]
# Cleanup empty list
if not self.record[tag_code]:
del self.record[tag_code]
def __len__(self):
return sum(len(fields) for fields in self.record.itervalues())
def get(self, tag, default):
try:
r = self[tag]
except KeyError:
r = default
return r
def __eq__(self, b):
if set(self.record.keys()) != set(b.record.keys()):
return False
for tag, fields in self.record.iteritems():
if set(fields) != set(b[tag]):
return False
return True
def __hash__(self):
return hash(tuple(self.record.iteritems()))
def __repr__(self):
if '001' in self.record:
s = u'BibRecord(%s)' % list(self['001'])[0].value
else:
s = u'BibRecord(fields=%s)' % repr(self.record)
return s
def find_subfields(self, tag):
tag_code, ind1, ind2, subfield_code = parse_tag(tag)
results = []
for field in self.record.get(tag_code, []):
if ind1 != '%' and field.ind1 != ind1:
continue
if ind2 != '%' and field.ind2 != ind2:
continue
for subfield in field.subfields:
if subfield_code is None or subfield.code == subfield_code:
results.append(subfield)
return results
def find_fields(self, tag):
tag_code, ind1, ind2, dummy = parse_tag(tag)
results = []
for field in self.record.get(tag_code, []):
if ind1 != '%' and field.ind1 != ind1:
continue
if ind2 != '%' and field.ind2 != ind2:
continue
results.append(field)
return results
def add_field(self, tag):
tag_code, ind1, ind2, dummy = parse_tag(tag)
field = BibRecordField(ind1=ind1, ind2=ind2)
self.record.setdefault(tag_code, []).append(field)
return field
def add_subfield(self, tag, value):
tag_code, ind1, ind2, subfield_code = parse_tag(tag)
subfield = BibRecordSubField(code=subfield_code, value=value)
field = BibRecordField(ind1=ind1, ind2=ind2, subfields=[subfield])
self.record.setdefault(tag_code, []).append(field)
return subfield
def _to_element_tree(self):
root = ET.Element('record')
for tag, fields in sorted(self.record.iteritems(), key=itemgetter(0)):
for field in fields:
if tag.startswith('00'):
controlfield = ET.SubElement(root,
'controlfield',
{'tag': tag})
controlfield.text = field.value
else:
attribs = {'tag': tag,
'ind1': field.ind1,
'ind2': field.ind2}
datafield = ET.SubElement(root, 'datafield', attribs)
for subfield in field.subfields:
attrs = {'code': subfield.code}
s = ET.SubElement(datafield, 'subfield', attrs)
s.text = subfield.value
return root
def to_xml(self, encoding='utf-8'):
return ET.tostring(self._to_element_tree(), encoding=encoding)
class BibRecordControlField(object):
def __init__(self, value):
self.value = value
def __eq__(self, b):
return self.value == b.value
def __hash__(self):
return hash(self.value)
class BibRecordField(object):
def __init__(self, ind1=" ", ind2=" ", subfields=None):
self.ind1 = ind1
self.ind2 = ind2
if subfields is None:
subfields = []
self.subfields = subfields
def __repr__(self):
return 'BibRecordField(ind1=%s, ind2=%s, subfields=%s)' \
% (repr(self.ind1), repr(self.ind2), repr(self.subfields))
def __eq__(self, b):
return self.ind1 == b.ind1 and self.ind2 == b.ind2 \
and set(self.subfields) == set(b.subfields)
def __hash__(self):
return hash((self.ind1, self.ind2, tuple(self.subfields)))
def __len__(self):
return len(self.subfields)
def __getitem__(self, code):
"""Returns all the values of the subfields with given code
@see get_subfield_values()
"""
return self.get_subfield_values(code)
def __setitem__(self, code, value):
"""Replaces the value of a single subfield element
e.g. MARC:
999C5 $ahello1$ahello2$bhello3
record['999'][0].find_subfields('a')
Returns ['hello1', 'hello2']
"""
subfields = self.find_subfields(code)
assert len(subfields) == 1
subfields[0].value = value
def __delitem__(self, code):
self.subfields = [s for s in self.subfields if s.code != code]
def find_subfields(self, code):
"""Returns all the values of the subfields with given code
e.g. MARC:
999C5 $ahello1$ahello2$bhello3
record['999'][0].find_subfields('a')
Returns ['hello1', 'hello2']
"""
return [s for s in self.subfields if s.code == code]
def get_subfield_values(self, code):
return [s.value for s in self.subfields if s.code == code]
def add_subfield(self, code, value):
subfield = BibRecordSubField(code=code, value=value)
self.subfields.append(subfield)
return subfield
class BibRecordSubField(object):
def __init__(self, code, value):
self.code = code
self.value = value
def __repr__(self):
return 'BibRecordSubField(code=%s, value=%s)' \
% (repr(self.code), repr(self.value))
def __eq__(self, b):
return self.code == b.code and self.value == b.value
def __hash__(self):
return hash((self.code, self.value))

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