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bibeditmulti_engine.py
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## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 CERN.
##
## CDS 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.
##
## CDS 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 CDS Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""CDS Invenio Multiple Record Editor Engine.
Every action related to record modification is performed
by specific class (successor of some of the commands).
Every of these classes is designed to perform specific action.
The engine itself receives a list of this classes and after retrieving
the records, asks the commands to perform their changes. This way the
engine itself is independent of the actions for modification of the records.
When we need to perform a new action on the records, we define a new command
and take care to pass it to the engine.
***************************************************************************
Subfield commands represent the actions performed on the subfields
of the record. The interface of these commands is defined in their
base class.
"""
__revision__ = "$Id"
from invenio import search_engine
from invenio import bibrecord
from invenio import bibformat
from invenio.config import CFG_TMPDIR
from time import strftime
from invenio.bibtask import task_low_level_submission
from invenio import template
multiedit_templates = template.load('bibeditmulti')
# base command for subfields
class BaseSubfieldCommand:
"""Base class for commands manipulating subfields"""
def __init__(self, subfield, value = "", new_value = ""):
"""Initialization."""
self._subfield = subfield
self._value = value
self._new_value = new_value
def process_field(self, record, tag, field_number):
"""Make changes to a record.
By default this method is empty.
Every specific command provides its own implementation"""
pass
def _perform_on_all_matching_subfields(self, record, tag, field_number, callback):
"""Perform an action on all subfields of a given field matching
the subfield represented by the current command.
e.g. change the value of all subfields 'a' in a given field
This method is necessary because in order to make changes in the
subfields of a given field you always have to iterate through all
of them. This is repetition of code is extracted in this method.
@param record: record structure representing record to be modified
@param tag: the tag used to identify the field
@param field_number: field number used to identify the field
@param callback: callback method that will be called to
perform an action on the subfield.
This callback should accept the following parameters:
record, tag, field_number, subfield_index
"""
if tag not in record.keys():
return
for field in record[tag]:
if field[4] == field_number:
subfield_index = 0
for subfield in field[0]:
if subfield[0] == self._subfield:
callback(record, tag, field_number, subfield_index)
subfield_index = subfield_index+1
# specific commands for subfields
class AddSubfieldCommand(BaseSubfieldCommand):
"""Add subfield to a given field"""
def process_field(self, record, tag, field_number):
"""@see: BaseSubfieldCommand.process_field"""
bibrecord.record_add_subfield_into(record, tag,
self._subfield, self._value,
field_position_global=field_number)
class DeleteSubfieldCommand(BaseSubfieldCommand):
"""Delete subfield from a given field"""
def process_field(self, record, tag, field_number):
"""@see: BaseSubfieldCommand.process_field"""
action = lambda record, tag, field_number, subfield_index: \
bibrecord.record_delete_subfield_from(record, tag,
subfield_index,
field_position_global=field_number)
self._perform_on_all_matching_subfields(record, tag,
field_number, action)
class ReplaceSubfieldContentCommand(BaseSubfieldCommand):
"""Replace content of subfield in a given field"""
def process_field(self, record, tag, field_number):
"""@see: BaseSubfieldCommand.process_field"""
action = lambda record, tag, field_number, subfield_index: \
bibrecord.record_modify_subfield(record, tag,
self._subfield,
self._value,
subfield_index,
field_position_global=field_number)
self._perform_on_all_matching_subfields(record,
tag,
field_number,
action)
class ReplaceTextInSubfieldCommand(BaseSubfieldCommand):
"""Replace text in content of subfield of a given field"""
def process_field(self, record, tag, field_number):
"""@see: BaseSubfieldCommand.process_field"""
def replace_text(record, tag, field_number, subfield_index):
"""Method for replacing the text, performed on
all the matching fields."""
#get the field value
field_value = ""
for field in record[tag]:
if field[4] == field_number:
subfields = field[0]
(field_code, field_value) = subfields[subfield_index]
#replace text
new_value = field_value.replace(self._value, self._new_value)
#update the subfield
bibrecord.record_modify_subfield(record, tag,
self._subfield, new_value,
subfield_index,
field_position_global=field_number)
self._perform_on_all_matching_subfields(record,
tag,
field_number,
replace_text)
"""***************************************************************************
Field commands represent the actions performed on the fields
of the record. The interface of these commands is defined in their
base class.
In general the changes related to field's subfields are handled by subfield
commands, that are passed to the field command.
"""
# base command for fields
class BaseFieldCommand:
"""Base class for commands manipulating record fields"""
def __init__(self, tag, ind1, ind2, subfield_commands):
"""Initialization."""
self._tag = tag
self._ind1 = ind1
self._ind2 = ind2
self._subfield_commands = subfield_commands
def process_record(self, record):
"""Make changes to a record.
By default this method is empty.
Every specific command provides its own implementation"""
pass
def _apply_subfield_commands_to_field(self, record, field_number):
"""Applies all subfield commands to a given field"""
for subfield_command in self._subfield_commands:
subfield_command.process_field(record, self._tag, field_number)
# specific commands for fields
class AddFieldCommand(BaseFieldCommand):
"""Deletes given fields from a record"""
def process_record(self, record):
"""@see: BaseFieldCommand.process_record"""
# if the tag is empty, we don't make any changes
if self._tag == "" or self._tag == None:
return
field_number = bibrecord.record_add_field(record, self._tag,
self._ind1, self._ind2)
self._apply_subfield_commands_to_field(record, field_number)
class DeleteFieldCommand(BaseFieldCommand):
"""Deletes given fields from a record"""
def process_record(self, record):
"""@see: BaseFieldCommand.process_record"""
bibrecord.record_delete_field(record, self._tag, self._ind1, self._ind2)
class UpdateFieldCommand(BaseFieldCommand):
"""Deletes given fields from a record"""
def process_record(self, record):
"""@see: BaseFieldCommand.process_record"""
# if the tag is empty, we don't make any changes
if self._tag == "" or self._tag == None:
return
matching_field_instances = \
bibrecord.record_get_field_instances(record, self._tag,
self._ind1, self._ind2)
for current_field in matching_field_instances:
self._apply_subfield_commands_to_field(record, current_field[4])
def perform_request_index(language):
"""Creates the page of MultiEdit
@param language: language of the page
"""
return multiedit_templates.page_contents(language=language)
def get_scripts():
"""Returns JavaScripts that have to be
imported in the page"""
return multiedit_templates.scripts()
def get_css():
"""Returns the local CSS for the pages."""
return multiedit_templates.styles()
def perform_request_detailed_record(record_id, update_commands, output_format, language):
"""Returns
@param record_id: the identifier of the record
@param update_commands: list of commands used to update record contents
@param output_format: specifies the output format as expected from bibformat
@param language: language of the page
"""
record_content = _get_formated_record(record_id=record_id,
output_format=output_format,
update_commands = update_commands,
language=language)
result = multiedit_templates.detailed_record(record_content, language)
return result
def perform_request_test_search(search_criteria, update_commands, output_format, page_to_display, language):
"""Returns the results of a test search.
@param search_criteria: search criteria used in the test search
@param update_commands: list of commands used to update record contents
@param output_format: specifies the output format as expected from bibformat
@param page_to_display: the number of the page that should be displayed to the user
@param language: the language used to format the content
"""
RECORDS_PER_PAGE = 10
record_IDs = search_engine.perform_request_search(p=search_criteria)
number_of_records = len(record_IDs)
if page_to_display < 1:
page_to_display = 1
last_page_number = number_of_records/RECORDS_PER_PAGE+1
if page_to_display > last_page_number:
page_to_display = last_page_number
first_record_to_display = RECORDS_PER_PAGE * (page_to_display - 1)
last_record_to_display = (RECORDS_PER_PAGE*page_to_display) - 1
record_IDs = record_IDs[first_record_to_display:last_record_to_display]
records_content = []
for record_id in record_IDs:
formated_record = _get_formated_record(record_id=record_id,
output_format=output_format,
update_commands = update_commands,
language=language)
records_content.append((record_id, formated_record))
result = multiedit_templates.search_results(records = records_content,
number_of_records = number_of_records,
current_page = page_to_display,
records_per_page = RECORDS_PER_PAGE,
language = language)
return result
def perform_request_submit_changes(search_criteria, update_commands, language):
"""Submits changes for upload into database.
@param search_criteria: search criteria used in the test search
@param update_commands: list of commands used to update record contents
@param language: the language used to format the content
"""
# FIXME: remove this row when you want to allow submition
# It is disabled during the test period.
return "This functionality is disabled during the testing period."
_submit_changes_to_bibupload(search_criteria, update_commands)
#FIXME: return message form the templates
return "Changes are sent to the server. \
It will take some time before they are applied."
def _get_formated_record(record_id, output_format, update_commands, language):
"""Returns a record in a given format
@param record_id: the ID of record to format
@param output_format: an output format code (or short identifier for the output format)
@param update_commands: list of commands used to update record contents
@param language: the language to use to format the record
"""
updated_record = _get_updated_record(record_id, update_commands)
xml_record = bibrecord.record_xml_output(updated_record)
# FIXME: Remove this as soon as the formatting for MARC is
# implemented in bibformat
if "hm" == output_format:
result = _create_marc(xml_record)
return result
result = bibformat.format_record(recID=None,
of=output_format,
xml_record=xml_record,
ln=language)
return result
# FIXME: Remove this method as soon as the formatting for MARC is
# implemented in bibformat
from invenio import xmlmarc2textmarclib as xmlmarc2textmarclib
def _create_marc(records_xml):
"""Creates MARC from MARCXML.
@param records_xml: MARCXML containing information about the records
@return: string containing information about the records
in MARC format
"""
aleph_marc_output = "<pre>"
records = bibrecord.create_records(records_xml)
for (record, status_code, list_of_errors) in records:
# The system number is in field 970a
# By this reason it should exist in the MARC XML
# otherwise it will be None in the output ALEPH marc
sysno_options = {"text-marc":0}
sysno = xmlmarc2textmarclib.get_sysno_from_record(record,
sysno_options)
if sysno == None:
sysno = ""
options = {"aleph-marc":1, "correct-mode":1, "append-mode":0,
"delete-mode":0, "insert-mode":0, "replace-mode":0,
"text-marc":0}
aleph_record = xmlmarc2textmarclib.create_marc_record(record,
sysno,
options)
aleph_marc_output += aleph_record
aleph_marc_output += "</pre>"
return aleph_marc_output
def _submit_changes_to_bibupload(search_criteria, update_commands):
"""This methods takes care of submitting the changes to the server
through bibupload.
@param search_criteria: the search criteria used for filtering the
records. The changes will be applied to all the records matching
the criteria
@param update_commands: the commands defining the changes. These
commands perform the necessary changes before the records are submitted"""
record_IDs = search_engine.perform_request_search(p=search_criteria)
updated_records = []
for current_id in record_IDs:
current_updated_record = _get_updated_record(current_id, update_commands)
updated_records.append(current_updated_record)
file_path = _get_file_path_for_bibupload()
_save_records_xml(updated_records, file_path)
_upload_file_with_bibupload(file_path)
def _get_updated_record(record_id, update_commands):
"""Applies all the changes specified by the commands
to record identified by record_id and returns resulting record
@param record_id: identifier of the record that will be updated
@param update_commands: list of commands used to update record contents
@return: updated record structure"""
record = search_engine.get_record(recid=record_id)
for current_command in update_commands:
current_command.process_record(record)
return record
def _upload_file_with_bibupload(file_path):
"""Uploads file with bibupload"""
#FIXME: Replace with -c (corrections)
#when we add possibility to delete fields in correction mode
task_low_level_submission('bibupload', 'multiedit', '-P', '5', '-r',
'%s' % file_path)
def _get_file_path_for_bibupload():
"""Returns file path for saving a file for bibupload """
current_time = strftime("%Y%m%d%H%M%S")
return "%s/%s_%s%s" % (CFG_TMPDIR, "multiedit_", current_time, ".xml")
def _save_records_xml(records, file_path):
"""Saves records in a file in XML format
@param records: list of records (record structures)
@param file_path: path to the file where the XML will be saved."""
output_file = None
try:
output_file = open(file_path, "w")
records_xml = bibrecord.print_recs(records)
output_file.write(records_xml)
finally:
if not output_file is None:
output_file.close()

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