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bibexport_method_fieldexporter.py
8f0027eea7eemaint-1.0

bibexport_method_fieldexporter.py
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			# -- coding: utf-8 --
			## $Id: search_engine_query_parser.py,v 1.12 2008/06/13 15:35:13 rivanov Exp $

			## This file is part of Invenio.
			## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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.

			# pylint: disable=C0301

			"""Invenio Search Engine query parsers."""

			__lastupdated__ = """$Date: 2008/06/13 15:35:13 $"""

			__revision__ = "$Id: search_engine_query_parser.py,v 1.12 2008/06/13 15:35:13 rivanov Exp $"

			from invenio.bibtask import write_message

			# imports used in FieldExporter class
			from invenio import search_engine
			from invenio import bibrecord
			from invenio import bibdocfile
			import os

			# imports used in perform_request_... methods
			from invenio.config import CFG_SITE_LANG
			from invenio import bibexport_method_fieldexporter_dblayer as fieldexporter_dblayer

			from invenio import template
			fieldexporter_templates = template.load('bibexport_method_fieldexporter')
			from invenio.messages import gettext_set_language

			def run_export_method(jobname):
			"""Main function, reading params and running the task."""
			write_message("bibexport_fieldexporter: job %s started." % jobname)

			job = fieldexporter_dblayer.get_job_by_name(jobname)
			job_result = _run_job(job)

			if job_result.STATUS_CODE_OK != job_result.get_status():
			error_message = job_result.get_status_message()
			write_message("Error during %s execution. Error message: %s" % (jobname, error_message) )

			write_message("bibexport_fieldexporter: job %s started." % jobname)

			def _run_job(job):
			"""Execute a job and saves the results

			@param job: Job object containing inforamtion about the job

			@return: JobResult object containing informatoin about the result
			of job execution
			"""
			exporter = FieldExporter()

			job_result = exporter.execute_job(job)

			fieldexporter_dblayer.save_job_result(job_result)

			return job_result

			class FieldExporter:
			"""Provides mothods for exporting given fields from
			records corresponding to a given search criteria.

			It provides also methods for transforming the resulting
			MARC XML into other formats.
			"""
			def __init__(self):
			"""Nothing to init"""
			pass

			def _export_fields(self, search_criteria, output_fields):
			"""Export fields that are among output_fields from
			all the records that match the search criteria.

			@param search_criteria: combination of search terms in Invenio
			@param output_fields: list of fields that should remain in the records

			@return: MARC XML with records containing only the fields that are
			among output fields
			"""
			records = self._get_records(search_criteria)

			filtered_xml = self._filter_records_fields(records, output_fields)

			return filtered_xml

			def execute_query(self, query):
			"""Executes a query and returns the result of execution.

			@param query: Query object containing information about the query.

			@return: QueryResult object containing the result.
			"""
			search_criteria = query.get_search_criteria()
			output_fields = query.get_output_fields()

			xml_result = self._export_fields(search_criteria, output_fields)

			query_result = fieldexporter_dblayer.QueryResult(query, xml_result)

			return query_result

			def execute_job(self, job):
			"""Executes a job and returns the result of execution.

			@param job: Job object containing information about the job.

			@return: JobResult object containing the result.
			"""
			job_result = fieldexporter_dblayer.JobResult(job)

			job_queries = fieldexporter_dblayer.get_job_queries(job.get_id())

			for current_query in job_queries:
			current_query_result = self.execute_query(current_query)
			job_result.add_query_result(current_query_result)

			return job_result

			def _get_records(self, search_criteria):
			"""Creates MARC XML containing all the records corresponding
			to a given search criteria.

			@param search_criteria: combination of search terms in Invenio

			@return: MARC XML containing all the records corresponding
			to the search criteria"""
			record_IDs = search_engine.perform_request_search(p = search_criteria)

			records_XML = self._create_records_xml(record_IDs)

			return records_XML

			def _filter_records_fields(self, records_xml, output_fields):
			"""Leaves in the records only fields that are necessary.
			All the other fields are removed from the records.

			@param records_xml: MARC XML containing all the information about the records
			@param output_fields: list of fields that should remain in the records

			@return: MARC XML with records containing only fields that are
			in output_fields list.
			"""
			# Add 001/970 to the output fields. 970 is necessary for system number
			# extraction when exporting in aleph marc. When we add more formats,
			# we can add it optionally only when exporting aleph marc.
			output_fields.append("001")
			output_fields.append("970")

			records = bibrecord.create_records(records_xml)
			output_records = []

			for (record, status_code, list_of_errors) in records:
			record = self._filter_fields(record, output_fields)
			# do not return empty records
			if not self._is_record_empty(record):
			output_records.append(record)

			output_xml = bibrecord.print_recs(output_records)

			return output_xml

			def _is_record_empty(self, record):
			"""Check if a record is empty.

			We assume that record is empty if all the values of the
			tags are empty lists or the record dictionary itself is empty.

			@param record: record structure (@see: bibrecord.py for details)

			@return True if the record is empty
			"""
			for value in record.values():
			if len(value) > 0:
			return False

			return True

			def _filter_fields(self, record, output_fields):
			"""Removes from the record all the fields
			that are not output_fields.

			@param record: record structure (@see: bibrecord.py for details)
			@param output_fields: list of fields that should remain in the record

			@return: record containing only fields among output_fields
			"""
			# Tibor's new implementation:
			for tag in record.keys():
			if tag not in output_fields:
			bibrecord.record_delete_fields(record, tag)
			return record

			# Rado's old implementation that leads to bibrecord-related
			# bug, see <https://savannah.cern.ch/task/?10267>:
			record_keys = record.keys()

			# Check if any of the tags, fields or subfields match
			# any value in output_fields. In case of match we leave
			# the element and its children in the record.
			#
			# If the element and all its children are not among the
			# output fields, it is deleted
			for tag in record_keys:
			tag = tag.lower()
			if tag not in output_fields:
			for (subfields, ind1, ind2, value, field_number) in record[tag]:
			current_field = tag + ind1.strip() + ind2.strip()
			current_field = current_field.lower()
			if current_field not in output_fields:
			delete_parents = True

			for (code, value) in subfields:
			current_subfield = current_field + code
			current_subfield = current_subfield.lower()
			if current_subfield not in output_fields:
			bibrecord.record_delete_subfield(record, tag, code, ind1, ind2)
			else:
			delete_parents = False

			if delete_parents:
			bibrecord.record_delete_field(record, tag, ind1, ind2)
			return record

			def _create_records_xml(self, record_IDs):
			"""Creates XML containing all the information
			for the records with the given identifiers

			@param record_IDs: list of identifiers of records

			@return: MARC XML containing all the information about the records
			"""
			output_xml = "<collection>"

			for record_id in record_IDs:
			record_xml = search_engine.print_record(recID = record_id, format = "xm")
			output_xml += record_xml

			output_xml += "</collection>"

			return output_xml

			def get_css():
			"""Returns the CSS for field exporter pages."""
			return fieldexporter_templates.tmpl_styles()

			def get_navigation_menu(language = CFG_SITE_LANG):
			"""Returns HTML reresenting the navigation menu
			of field exporter

			@param language: language of the page
			"""
			return fieldexporter_templates.tmpl_navigation_menu(language)

			def perform_request_new_job(language = CFG_SITE_LANG):
			"""Displays a page for creation of a new job.

			@param language: language of the page
			"""
			job = fieldexporter_dblayer.Job()
			return fieldexporter_templates.tmpl_edit_job(job, language = language)

			def perform_request_edit_job(job_id, user_id, language = CFG_SITE_LANG):
			"""Displays a page where the user can edit information
			about a job.

			@param job_id: identifier of the job that will be edited
			@param user_id: identifier of the user
			@param language: language of the page
			"""
			_check_user_ownership_on_job(user_id, job_id, language)

			job = fieldexporter_dblayer.get_job(job_id)
			return fieldexporter_templates.tmpl_edit_job(job, language = language)

			def perform_request_save_job(job, user_id, language = CFG_SITE_LANG):
			"""Saves a job.

			@param job: Object containing information about the job
			@param user_id: identifier of the user saving the job
			@param language: language of the page

			@return: identifier of the job
			"""
			job_id = job.get_id()
			_check_user_ownership_on_job(user_id, job_id, language)

			return fieldexporter_dblayer.save_job(user_id, job)

			def perform_request_delete_jobs(job_ids, user_id, language = CFG_SITE_LANG):
			"""Deletes all the jobs which ids are given as a parameter.

			@param job_ids: list with identifiers of jobs that have to be deleted
			@param user_id: identifier of the user deleting the jobs
			@param language: language of the page
			"""
			for job_id in job_ids:
			_check_user_ownership_on_job(user_id, job_id, language)
			fieldexporter_dblayer.delete_job(job_id)

			def perform_request_run_jobs(job_ids, user_id, language = CFG_SITE_LANG):
			"""Runs all the jobs which ids are given as a parameter

			@param job_ids: list with identifiers of jobs that have to be run
			@param user_id: identifier of the user running the jobs
			@param language: language of the page
			"""
			for current_job_id in job_ids:
			_check_user_ownership_on_job(user_id, current_job_id, language)
			current_job = fieldexporter_dblayer.get_job(current_job_id)
			_run_job(current_job)

			def perform_request_jobs(user_id, language = CFG_SITE_LANG):
			"""Displays a page containing list of all
			jobs of the current user

			@param user_id: identifier of the user owning the jobs
			@param language: language of the page
			"""
			all_jobs = fieldexporter_dblayer.get_all_jobs(user_id)
			return fieldexporter_templates.tmpl_display_jobs(jobs = all_jobs, language = language)

			def perform_request_job_queries(job_id, user_id, language = CFG_SITE_LANG):
			"""Displays a page containing list of all
			all queries for a given job

			@param job_id: identifier of the job containing the queries
			@param user_id: identifier of the current user
			@param language: language of the page
			"""
			_check_user_ownership_on_job(user_id, job_id, language)
			queries = fieldexporter_dblayer.get_job_queries(job_id)
			return fieldexporter_templates.tmpl_display_job_queries(job_queries = queries,
			job_id = job_id,
			language = language)

			def perform_request_new_query(job_id, user_id, language = CFG_SITE_LANG):
			"""Displays a page for creation of new query.

			@param job_id: identifier of the job containing the query
			@param user_id: identifier of user creating the query
			@param language: language of the page
			"""
			_check_user_ownership_on_job(user_id, job_id, language)
			query = fieldexporter_dblayer.Query()
			return fieldexporter_templates.tmpl_edit_query(query, job_id, language)

			def perform_request_edit_query(query_id, job_id, user_id, language = CFG_SITE_LANG):
			"""Displays a page where the user can edit information
			about a job.

			@param query_id: identifier of the query that will be edited
			@param job_id: identifier of the job containing the query
			@param user_id: identifier of the user editing the query
			@param language: language of the page
			"""
			_check_user_ownership_on_job(user_id, job_id, language)
			_check_user_ownership_on_query(user_id, query_id, language)

			query = fieldexporter_dblayer.get_query(query_id)
			return fieldexporter_templates.tmpl_edit_query(query, job_id, language)

			def perform_request_save_query(query, job_id, user_id, language = CFG_SITE_LANG):
			"""Saves a query in database.

			@param query: Query objectect containing the necessary informatoin
			@param job_id: identifier of the job containing the query
			@param user_id: identifier of the user saving the query
			@param language: language of the page
			"""
			_check_user_ownership_on_job(user_id, job_id, language)
			_check_user_ownership_on_query(user_id, query.get_id(), language)
			fieldexporter_dblayer.save_query(query, job_id)

			def perform_request_delete_queries(query_ids, user_id, language = CFG_SITE_LANG):
			"""Deletes all the queries which ids are given as a parameter.

			@param query_ids: list with identifiers of queries that have to be deleted
			@param user_id: identifier of the user deleting the queries
			@param language: language of the page
			"""
			for query_id in query_ids:
			_check_user_ownership_on_query(user_id, query_id, language)
			fieldexporter_dblayer.delete_query(query_id)

			def perform_request_run_queries(query_ids, user_id, job_id, language = CFG_SITE_LANG):
			"""Displays a page contining results from execution of given queries.

			@param query_ids: list of query identifiers
			@param user_id: identifier of the user running the queries
			@param language: language of the page
			"""
			exporter = FieldExporter()

			_check_user_ownership_on_job(user_id, job_id, language)
			job = fieldexporter_dblayer.get_job(job_id)
			job_result = fieldexporter_dblayer.JobResult(job)

			queries_results = []
			for current_id in query_ids:
			_check_user_ownership_on_query(user_id, current_id, language)
			current_query = fieldexporter_dblayer.get_query(current_id)
			current_result = exporter.execute_query(current_query)
			job_result.add_query_result(current_result)

			return fieldexporter_templates.tmpl_display_queries_results(job_result, language)

			def perform_request_job_history(user_id, language = CFG_SITE_LANG):
			"""Displays a page containing information about the executed jobs.

			@param user_id: identifier of the user owning the reuslts
			@param language: language of the page
			"""
			job_result_identifiers = fieldexporter_dblayer.get_all_job_result_ids(user_id = user_id)
			job_results = fieldexporter_dblayer.get_job_results(job_result_identifiers)

			return fieldexporter_templates.tmpl_display_job_history(job_results, language)

			def perform_request_job_results(job_result_id, user_id, language = CFG_SITE_LANG):
			"""Displays a page with information about the results of a particular job.

			@param job_result_id: identifier of the job result that should be displayed
			@param user_id: identifier of the current user
			@param language: language of the page
			"""
			_check_user_ownership_on_job_result(user_id, job_result_id, language)

			job_result = fieldexporter_dblayer.get_job_result(job_result_id)

			return fieldexporter_templates.tmpl_display_job_result_information(job_result, language)

			def perform_request_download_job_result(req, job_result_id, output_format, user_id, language = CFG_SITE_LANG):
			"""
			Returns to the browser zip file containing the content of the job result

			@param req: request as received from apache
			@param job_result_id: identifier of the job result that should be displayed
			@param user_id: identifier of the current user
			@param language: language of the page
			@param output_format: format for downloading the result
			"""
			_check_user_ownership_on_job_result(user_id, job_result_id, language)

			job_result = fieldexporter_dblayer.get_job_result(job_result_id)
			if output_format != fieldexporter_dblayer.Job.OUTPUT_FORMAT_MISSING:
			job_result.get_job().set_output_format(output_format)

			download_file_name = "result.zip"
			temp_zip_file_path = ""

			try:
			temp_zip_file_path = fieldexporter_dblayer.create_temporary_zip_file_with_job_result(job_result)
			bibdocfile.stream_file(req, temp_zip_file_path, download_file_name)
			finally:
			if os.path.exists(temp_zip_file_path):
			os.remove(temp_zip_file_path)

			def perform_request_display_job_result(job_result_id, output_format, user_id, language = CFG_SITE_LANG):
			"""Displays a page with the results of a particular job.

			@param job_result_id: identifier of the job result that should be displayed
			@param user_id: identifier of the current user
			@param language: language of the page
			"""
			_check_user_ownership_on_job_result(user_id, job_result_id, language)

			job_result = fieldexporter_dblayer.get_job_result(job_result_id)

			if output_format != fieldexporter_dblayer.Job.OUTPUT_FORMAT_MISSING:
			job_result.get_job().set_output_format(output_format)

			return fieldexporter_templates.tmpl_display_queries_results(job_result, language)

			def _check_user_ownership_on_job(user_id, job_id, language = CFG_SITE_LANG):
			"""Check if user owns a job. In case user is not the owner, exception is thrown.

			@param user_id: identifier of the user
			@param job_id: identifier of the job
			@param language: language of the page
			"""
			if fieldexporter_dblayer.Job.ID_MISSING == job_id:
			return

			if not fieldexporter_dblayer.is_user_owner_of_job(user_id, job_id):
			_ = gettext_set_language(language)
			error_message = _("You are not authorised to access this resource.")
			raise AccessDeniedError(error_message)

			def _check_user_ownership_on_job_result(user_id, job_result_id, language = CFG_SITE_LANG):
			"""Check if user owns a job result. In case user is not the owner, exception is thrown.

			@param user_id: identifier of the user
			@param job_result_id: identifier of the job result
			@param language: language of the page
			"""
			if fieldexporter_dblayer.JobResult.ID_MISSING == job_result_id:
			return

			if not fieldexporter_dblayer.is_user_owner_of_job_result(user_id, job_result_id):
			_ = gettext_set_language(language)
			error_message = _("You are not authorised to access this resource.")
			raise AccessDeniedError(error_message)

			def _check_user_ownership_on_query(user_id, query_id, language = CFG_SITE_LANG):
			"""Check if user owns a job result. In case user is not the owner, exception is thrown.

			@param user_id: identifier of the user
			@param job_result_id: identifier of the job result
			@param language: language of the page
			"""
			if fieldexporter_dblayer.Query.ID_MISSING == query_id:
			return

			if not fieldexporter_dblayer.is_user_owner_of_query(user_id, query_id):
			_ = gettext_set_language(language)
			error_message = _("You are not authorised to access this resource.")
			raise AccessDeniedError(error_message)

			class AccessDeniedError(Exception):
			"""Exception indicating an error during exportting for Google scholar."""

			_error_message = ""
			_inner_exception = None

			def __init__(self, error_message, inner_exception = None):
			"""Constructor of the exception"""
			Exception.__init__(self, error_message, inner_exception)

			self._error_message = error_message
			self._inner_exception = inner_exception

			def get_error_message(self):
			"""Returns the error message that explains the reason for the exception"""
			return self._error_message

			def get_inner_exception(self):
			"""Returns the inner exception that is the cause for the current exception"""
			return self._inner_exception

			def __str__(self):
			"""Returns string representation"""
			return self._error_message

R3600/modules/bibexport/lib/bibexport_method_fieldexporter.py8f0027eea7eemaint-1.0

bibexport_method_fieldexporter.pyView Options

R3600/modules/bibexport/lib/bibexport_method_fieldexporter.py
8f0027eea7eemaint-1.0

bibexport_method_fieldexporter.py
View Options