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bfe_video_platform_suggestions.py
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Sat, Jul 6, 07:14

bfe_video_platform_suggestions.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 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.
"""BibFormat element
* Part of the video platform prototype
* Creates a list of video suggestions
* Based on word similarity ranking
* Must be done in a collection that holds video records with thumbnails, title and author
"""
from invenio.config import CFG_SITE_URL
from invenio.bibdocfile import BibRecDocs
from invenio.intbitset import intbitset
from invenio.search_engine import perform_request_search
from invenio.bibrank_record_sorter import rank_records
from invenio.search_engine_utils import get_fieldvalues
from invenio.bibencode_utils import timecode_to_seconds
import random
html_skeleton_suggestion = """
<!-- VIDEO SUGGESTION -->
<div class="video_suggestion_box">
<div class="video_suggestion_thumbnail">
<a href="%(video_record_url)s">
<img src="%(video_thumb_url)s" alt="%(video_thumb_alt)s"/>
</a>
<div class="video_suggestion_duration">
%(video_duration)s
</div>
</div>
<div class="video_suggestion_title">
%(video_title)s
</div>
<div class="video_suggestion_author">
by %(video_authors)s
</div>
</div>
"""
def format_element(bfo, collection="Videos", threshold="75", maximum="3", shuffle="True"):
""" Creates video suggestions based on ranking algorithms
@param collection: Collection to take the suggestions from
@param threshold: Value between 0 and 100. Only records ranked higher than the value are presented.
@param maximum: Maximum suggestions to show
@param shuffle: True or False, should the suggestions be shuffled?
"""
if threshold.isdigit():
threshold = int(threshold)
else:
raise ValueError("The given threshold is not a digit")
if maximum.isdigit():
maximum = int(maximum)
else:
raise ValueError("The given maximum is not a digit")
if shuffle == "True":
shuffle = True
else:
shuffle = False;
suggestions = []
recid = bfo.control_field('001')
similar_records = find_similar_videos(recid, collection, threshold, maximum, shuffle)
for sim_recid in similar_records:
thumbnail = get_video_thumbnail(sim_recid)
title = get_video_title(sim_recid)
authors = get_video_authors(sim_recid)
url = get_video_record_url(sim_recid)
duration = get_video_duration(sim_recid)
suggestion = html_skeleton_suggestion % {
'video_record_url': url,
'video_thumb_url': thumbnail[0],
'video_thumb_alt': thumbnail[1],
'video_duration': duration,
'video_title': title,
'video_authors': authors,
}
suggestions.append(suggestion)
return "\n".join(suggestions)
def find_similar_videos(recid, collection="Videos", threshold=75, maximum=3, shuffle=True):
""" Returns a list of similar video records
"""
similar_records = []
collection_recids = intbitset(perform_request_search(cc=collection))
ranking = rank_records('wrd', 0, collection_recids, ['recid:' + str(recid)])
## ([6, 7], [81, 100], '(', ')', '')
for list_pos, rank in enumerate(ranking[1]):
if rank >= threshold:
similar_records.append(ranking[0][list_pos])
if shuffle:
if maximum > len(similar_records):
maximum = len(similar_records)
return random.sample(similar_records, maximum)
else:
return similar_records[:maximum]
def get_video_thumbnail(recid):
""" Returns the URL and ALT text for a video thumbnail of a given record
"""
comments = get_fieldvalues(recid, '8564_z')
descriptions = get_fieldvalues(recid, '8564_y')
urls = get_fieldvalues(recid, '8564_u')
for pos, comment in enumerate(comments):
if comment in ('SUGGESTIONTHUMB', 'BIGTHUMB', 'THUMB', 'SMALLTHUMB', 'POSTER'):
return (urls[pos], descriptions[pos])
return ("", "")
def get_video_title(recid):
""" Return the Title of a video record
"""
return get_fieldvalues(recid, '245__a')[0]
def get_video_authors(recid):
""" Return the Authors of a video record
"""
return ", ".join(get_fieldvalues(recid, '100__a'))
def get_video_record_url(recid):
""" Return the URL of a video record
"""
return CFG_SITE_URL + "/record/" + str(recid)
def get_video_duration(recid):
""" Return the duration of a video
"""
duration = get_fieldvalues(recid, '950__d')
if duration:
duration = duration[0]
duration = timecode_to_seconds(duration)
return human_readable_time(duration)
else:
return ""
def human_readable_time(seconds):
""" Creates a human readable duration representation
"""
for x in ['s','m','h']:
if seconds < 60.0:
return "%.0f %s" % (seconds, x)
seconds /= seconds
def escape_values(bfo):
"""
Called by BibFormat in order to check if output of this element
should be escaped.
"""
return 0

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