class Catalog(object):
def __init__(self, ref, fields, read_only=False, asynchronous_mode=True):
# Load the database
if isinstance(ref, (Database, WritableDatabase)):
self._db = ref
else:
path = lfs.get_absolute_path(ref)
if read_only:
self._db = Database(path)
else:
self._db = WritableDatabase(path, DB_OPEN)
db = self._db
self._asynchronous = asynchronous_mode
self._fields = fields
# Asynchronous mode
if not read_only and asynchronous_mode:
db.begin_transaction(False)
# Load the xfields from the database
self._metadata = {}
self._value_nb = 0
self._prefix_nb = 0
self._load_all_internal()
#######################################################################
# API / Public / Transactions
#######################################################################
def save_changes(self):
"""Save the last changes to disk.
"""
if not self._asynchronous:
raise ValueError, "The transactions are synchronous"
db = self._db
db.commit_transaction()
db.flush()
db.begin_transaction(False)
def abort_changes(self):
"""Abort the last changes made in memory.
"""
if not self._asynchronous:
raise ValueError, "The transactions are synchronous"
db = self._db
db.cancel_transaction()
self._load_all_internal()
db.begin_transaction(False)
#######################################################################
# API / Public / (Un)Index
#######################################################################
def index_document(self, document):
"""Add a new document.
"""
db = self._db
metadata = self._metadata
fields = self._fields
# Check the input
if type(document) is dict:
doc_values = document
else:
doc_values = document.get_catalog_values()
# Make the xapian document
metadata_modified = False
xdoc = Document()
for name, value in doc_values.iteritems():
if name not in fields:
warn_not_indexed_nor_stored(name)
field_cls = fields[name]
# New field ?
if name not in metadata:
info = metadata[name] = self._get_info(field_cls, name)
metadata_modified = True
else:
info = metadata[name]
# XXX This comment is no longer valid, now the key field is
# always abspath with field_cls = String
# Store the key field with the prefix 'Q'
# Comment: the key field is indexed twice, but we must do it
# one => to index (as the others)
# two => to index without split
# the problem is that "_encode != _index"
if name == 'abspath':
key_value = _reduce_size(_encode(field_cls, value))
xdoc.add_term('Q' + key_value)
# A multilingual value?
if isinstance(value, dict):
for language, lang_value in value.iteritems():
lang_name = name + '_' + language
# New field ?
if lang_name not in metadata:
lang_info = self._get_info(field_cls, lang_name)
lang_info['from'] = name
metadata[lang_name] = lang_info
metadata_modified = True
else:
lang_info = metadata[lang_name]
# The value can be None
if lang_value is not None:
# Is stored ?
if 'value' in lang_info:
xdoc.add_value(lang_info['value'],
_encode(field_cls, lang_value))
# Is indexed ?
if 'prefix' in lang_info:
# Comment: Index twice
_index(xdoc, field_cls, lang_value,
info['prefix'], language)
_index(xdoc, field_cls, lang_value,
lang_info['prefix'], language)
# The value can be None
elif value is not None:
# Is stored ?
if 'value' in info:
xdoc.add_value(info['value'], _encode(field_cls, value))
# Is indexed ?
if 'prefix' in info:
# By default language='en'
_index(xdoc, field_cls, value, info['prefix'], 'en')
# TODO: Don't store two documents with the same key field!
# Save the doc
db.add_document(xdoc)
# Store metadata ?
if metadata_modified:
db.set_metadata('metadata', dumps(metadata))
def unindex_document(self, abspath):
"""Remove the document that has value stored in its abspath.
If the document does not exist => no error
"""
data = _reduce_size(_encode(self._fields['abspath'], abspath))
self._db.delete_document('Q' + data)
#######################################################################
# API / Public / Search
#######################################################################
def get_unique_values(self, name):
"""Return all the terms of a given indexed field
"""
metadata = self._metadata
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return set()
# Ok
prefix = metadata[name]['prefix']
prefix_len = len(prefix)
return set([ t.term[prefix_len:] for t in self._db.allterms(prefix) ])
#######################################################################
# API / Private
#######################################################################
def _get_info(self, field_cls, name):
# The key field ?
if name == 'abspath':
if not (issubclass(field_cls, String) and
field_cls.stored and
field_cls.indexed):
raise ValueError, ('the abspath field must be declared as '
'String(stored=True, indexed=True)')
# Stored ?
info = {}
if getattr(field_cls, 'stored', False):
info['value'] = self._value_nb
self._value_nb += 1
# Indexed ?
if getattr(field_cls, 'indexed', False):
info['prefix'] = _get_prefix(self._prefix_nb)
self._prefix_nb += 1
return info
def _load_all_internal(self):
"""Load the metadata from the database
"""
self._value_nb = 0
self._prefix_nb = 0
metadata = self._db.get_metadata('metadata')
if metadata == '':
self._metadata = {}
else:
self._metadata = loads(metadata)
for name, info in self._metadata.iteritems():
if 'value' in info:
self._value_nb += 1
if 'prefix' in info:
self._prefix_nb += 1
def _query2xquery(self, query):
"""take a "itools" query and return a "xapian" query
"""
query_class = type(query)
fields = self._fields
metadata = self._metadata
# All Query
if query_class is AllQuery:
return Query('')
# PhraseQuery, the field must be indexed
if query_class is PhraseQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected '%s'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return Query()
info = metadata[name]
try:
prefix = info['prefix']
except KeyError:
raise ValueError, 'the field "%s" must be indexed' % name
field_cls = _get_field_cls(name, fields, info)
return _make_PhraseQuery(field_cls, query.value, prefix)
# RangeQuery, the field must be stored
if query_class is RangeQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected '%s'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return Query()
info = metadata[name]
value = info.get('value')
if value is None:
raise AttributeError, MSG_NOT_STORED.format(name=name)
field_cls = _get_field_cls(name, fields, info)
if field_cls.multiple:
error = 'range-query not supported on multiple fields'
raise ValueError, error
left = query.left
if left is not None:
left = _encode_simple_value(field_cls, left)
right = query.right
if right is not None:
right = _encode_simple_value(field_cls, right)
# Case 1: no limits, return everything
if left is None and right is None:
return Query('')
# Case 2: left limit only
if right is None:
return Query(OP_VALUE_GE, value, left)
# Case 3: right limit only
if left is None:
return Query(OP_VALUE_LE, value, right)
# Case 4: left and right
return Query(OP_VALUE_RANGE, value, left, right)
# StartQuery, the field must be stored
if query_class is StartQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected '%s'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return Query()
info = metadata[name]
value_nb = info.get('value')
if value_nb is None:
raise AttributeError, MSG_NOT_STORED.format(name=name)
field_cls = _get_field_cls(name, fields, info)
value = query.value
value = _encode(field_cls, value)
if value:
# good = {x / x >= value}
good = Query(OP_VALUE_GE, value_nb, value)
# Construct the variable end_value:
# end_value = the word "after" value: toto => totp
# Delete the '\xff' at the end of value
end_value = value
while end_value and ord(end_value[-1]) == 255:
end_value = end_value[:-1]
# Normal case: end_value is not empty
if end_value:
# The world after
end_value = end_value[:-1] + chr(ord(end_value[-1]) + 1)
# bad = {x / x >= end_value}
bad = Query(OP_VALUE_GE, value_nb, end_value)
# Return {x / x in good but x not in bad}
return Query(OP_AND_NOT, good, bad)
# If end_value is empty
else:
# Return {x / x in good}
return good
else:
# If value == '', we return everything
return Query('')
# TextQuery, the field must be indexed
if query_class is TextQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected %s for 'name'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return Query()
info = metadata[name]
field_cls = _get_field_cls(name, fields, info)
try:
prefix = info['prefix']
except KeyError:
raise ValueError, 'the field "%s" must be indexed' % name
# Remove accents from the value
value = query.value
if type(value) is not unicode:
raise TypeError, "unexpected %s for 'value'" % type(value)
value = value.translate(TRANSLATE_MAP)
qp = QueryParser()
qp.set_database(self._db)
return qp.parse_query(_encode(field_cls, value), TQ_FLAGS, prefix)
i2x = self._query2xquery
# Multiple query with single atom
if isinstance(query, _MultipleQuery) and len(query.atoms) == 1:
return i2x(query.atoms[0])
# And
if query_class is _AndQuery:
return Query(OP_AND, [ i2x(q) for q in query.atoms ])
# Or
if query_class is _OrQuery:
return Query(OP_OR, [ i2x(q) for q in query.atoms ])
# Not
if query_class is NotQuery:
return Query(OP_AND_NOT, Query(''), i2x(query.query))
class Catalog(object):
nb_changes = 0
logger = None
_db = None
read_only = False
def __init__(self, ref, fields, read_only=False, asynchronous_mode=True):
self.read_only = read_only
# Load the database
if isinstance(ref, (Database, WritableDatabase)):
path = None
self._db = ref
else:
path = lfs.get_absolute_path(ref)
if read_only:
self._db = Database(path)
else:
self._db = WritableDatabase(path, DB_OPEN)
db = self._db
self._asynchronous = asynchronous_mode
self._fields = fields
# FIXME: There's a bug in xapian:
# Wa cannot get stored values if DB not flushed
self.commit_each_transaction = True
# Asynchronous mode
if not read_only and asynchronous_mode:
db.begin_transaction(self.commit_each_transaction)
# Set XAPIAN_FLUSH_THRESHOLD
os.environ["XAPIAN_FLUSH_THRESHOLD"] = "2000"
# Load the xfields from the database
self._metadata = {}
self._value_nb = 0
self._prefix_nb = 0
self._load_all_internal()
if not read_only:
self._init_all_metadata()
# Catalog log
if path:
catalog_log = '{}/catalog.log'.format(path)
self.logger = CatalogLogger(catalog_log)
register_logger(self.logger, 'itools.catalog')
def _init_all_metadata(self):
"""Init new metadata (to avoid 'field is not indexed' warning)
"""
has_changes = False
metadata = self._metadata
for name, field_cls in self._fields.items():
if name not in metadata:
print('[Catalog] New field registered: {0}'.format(name))
has_changes = True
metadata[name] = self._get_info(field_cls, name)
else:
# If the field was in the catalog but is newly stored
if (not metadata[name].has_key('value') and
getattr(field_cls, 'stored', False)):
print('[Catalog] Indexed field is now stored: {0}'.format(name))
has_changes = True
metadata[name] = merge_dicts(
metadata[name],
self._get_info_stored())
# If the field was stored in the catalog but is newly indexed
if (not metadata[name].has_key('prefix') and
getattr(field_cls, 'indexed', False)):
print('[Catalog] Stored field is now indexed: {0}'.format(name))
has_changes = True
metadata[name] = merge_dicts(
metadata[name],
self._get_info_indexed())
if has_changes:
self._db.set_metadata('metadata', dumps(metadata))
self._db.commit_transaction()
self._db.begin_transaction(self.commit_each_transaction)
#######################################################################
# API / Public / Transactions
#######################################################################
def save_changes(self):
"""Save the last changes to disk.
"""
if not self._asynchronous:
raise ValueError, "The transactions are synchronous"
db = self._db
db.commit_transaction()
db.commit()
# FIXME: There's a bug in xapian:
# Wa cannot get stored values if DB not flushed
#if self.nb_changes > 200:
# # XXX Not working since cancel_transaction()
# # cancel all transactions not commited to disk
# # We have to use new strategy to abort transaction
# db.commit()
# if self.logger:
# self.logger.clear()
# self.nb_changes = 0
db.begin_transaction(self.commit_each_transaction)
def abort_changes(self):
"""Abort the last changes made in memory.
"""
if not self._asynchronous:
raise ValueError, "The transactions are synchronous"
db = self._db
if self.commit_each_transaction:
db.cancel_transaction()
db.begin_transaction(self.commit_each_transaction)
else:
raise NotImplementedError
self._load_all_internal()
def close(self):
if self._db is None:
msg = 'Catalog is already closed'
print(msg)
return
if self.read_only:
self._db.close()
self._db = None
return
if self.commit_each_transaction:
try:
self._db.cancel_transaction()
except:
print('Warning: cannot cancel xapian transaction')
self._db.close()
self._db = None
else:
self._db.close()
self._db = None
else:
self.abort_changes()
self._db.commit_transaction()
self._db.flush()
self._db.close()
self._db = None
if self.logger:
self.logger.clear()
#######################################################################
# API / Public / (Un)Index
#######################################################################
def index_document(self, document):
self.nb_changes += 1
abspath, term, xdoc = self.get_xdoc_from_document(document)
self._db.replace_document(term, xdoc)
if self.logger:
log_info(abspath, domain='itools.catalog')
def unindex_document(self, abspath):
"""Remove the document that has value stored in its abspath.
If the document does not exist => no error
"""
self.nb_changes += 1
data = _reduce_size(_encode(self._fields['abspath'], abspath))
self._db.delete_document('Q' + data)
if self.logger:
log_info(abspath, domain='itools.catalog')
def get_xdoc_from_document(self, doc_values):
"""Return (abspath, term, xdoc) from the document (resource or values as dict)
"""
term = None
metadata = self._metadata
# Check the input
if type(doc_values) is not dict:
raise NotImplementedError('Deprecated: doc_values should be a dict')
fields = self._fields
abspath = doc_values['abspath']
# Make the xapian document
metadata_modified = False
xdoc = Document()
for name, value in doc_values.iteritems():
if name not in fields:
warn_not_indexed_nor_stored(name)
field_cls = fields[name]
# New field ?
if name not in metadata:
info = metadata[name] = self._get_info(field_cls, name)
metadata_modified = True
else:
info = metadata[name]
# XXX This comment is no longer valid, now the key field is
# always abspath with field_cls = String
# Store the key field with the prefix 'Q'
# Comment: the key field is indexed twice, but we must do it
# one => to index (as the others)
# two => to index without split
# the problem is that "_encode != _index"
if name == 'abspath':
key_value = _reduce_size(_encode(field_cls, value))
term = 'Q' + key_value
xdoc.add_term(term)
# A multilingual value?
if isinstance(value, dict):
for language, lang_value in value.iteritems():
lang_name = name + '_' + language
# New field ?
if lang_name not in metadata:
lang_info = self._get_info(field_cls, lang_name)
lang_info['from'] = name
metadata[lang_name] = lang_info
metadata_modified = True
else:
lang_info = metadata[lang_name]
# The value can be None
if lang_value is not None:
# Is stored ?
if 'value' in lang_info:
xdoc.add_value(lang_info['value'],
_encode(field_cls, lang_value))
# Is indexed ?
if 'prefix' in lang_info:
# Comment: Index twice
_index(xdoc, field_cls, lang_value,
info['prefix'], language)
_index(xdoc, field_cls, lang_value,
lang_info['prefix'], language)
# The value can be None
elif value is not None:
# Is stored ?
if 'value' in info:
xdoc.add_value(info['value'], _encode(field_cls, value))
# Is indexed ?
if 'prefix' in info:
# By default language='en'
_index(xdoc, field_cls, value, info['prefix'], 'en')
# Store metadata ?
if metadata_modified:
metadata = self._metadata
self._db.set_metadata('metadata', dumps(metadata))
# Ok
return abspath, term, xdoc
#######################################################################
# API / Public / Search
#######################################################################
def get_unique_values(self, name):
"""Return all the terms of a given indexed field
"""
metadata = self._metadata
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return set()
# Ok
prefix = metadata[name]['prefix']
prefix_len = len(prefix)
return set([ t.term[prefix_len:] for t in self._db.allterms(prefix) ])
#######################################################################
# API / Private
#######################################################################
def _get_info(self, field_cls, name):
# The key field ?
if name == 'abspath':
if not (issubclass(field_cls, String) and
field_cls.stored and
field_cls.indexed):
raise ValueError, ('the abspath field must be declared as '
'String(stored=True, indexed=True)')
# Stored ?
info = {}
if getattr(field_cls, 'stored', False):
info = self._get_info_stored()
# Indexed ?
if getattr(field_cls, 'indexed', False):
info = merge_dicts(info, self._get_info_indexed())
# Ok
return info
def _get_info_stored(self):
value = self._value_nb
self._value_nb += 1
return {'value': value}
def _get_info_indexed(self):
prefix = _get_prefix(self._prefix_nb)
self._prefix_nb += 1
return {'prefix': prefix}
def _load_all_internal(self):
"""Load the metadata from the database
"""
self._value_nb = 0
self._prefix_nb = 0
metadata = self._db.get_metadata('metadata')
if metadata == '':
self._metadata = {}
else:
self._metadata = loads(metadata)
for name, info in self._metadata.iteritems():
if 'value' in info:
self._value_nb += 1
if 'prefix' in info:
self._prefix_nb += 1
def _query2xquery(self, query):
"""take a "itools" query and return a "xapian" query
"""
query_class = type(query)
fields = self._fields
metadata = self._metadata
# All Query
if query_class is AllQuery:
return Query('')
# PhraseQuery, the field must be indexed
if query_class is PhraseQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected '%s'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return Query()
info = metadata[name]
try:
prefix = info['prefix']
except KeyError:
raise ValueError, 'the field "%s" must be indexed' % name
field_cls = _get_field_cls(name, fields, info)
return _make_PhraseQuery(field_cls, query.value, prefix)
# RangeQuery, the field must be stored
if query_class is RangeQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected '%s'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return Query()
info = metadata[name]
value = info.get('value')
if value is None:
raise AttributeError, MSG_NOT_STORED.format(name=name)
field_cls = _get_field_cls(name, fields, info)
if field_cls.multiple:
error = 'range-query not supported on multiple fields'
raise ValueError, error
left = query.left
if left is not None:
left = _encode_simple_value(field_cls, left)
right = query.right
if right is not None:
right = _encode_simple_value(field_cls, right)
# Case 1: no limits, return everything
if left is None and right is None:
return Query('')
# Case 2: left limit only
if right is None:
return Query(OP_VALUE_GE, value, left)
# Case 3: right limit only
if left is None:
return Query(OP_VALUE_LE, value, right)
# Case 4: left and right
return Query(OP_VALUE_RANGE, value, left, right)
# StartQuery, the field must be stored
if query_class is StartQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected '%s'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return Query()
info = metadata[name]
value_nb = info.get('value')
if value_nb is None:
raise AttributeError, MSG_NOT_STORED.format(name=name)
field_cls = _get_field_cls(name, fields, info)
value = query.value
value = _encode(field_cls, value)
if value:
# good = {x / x >= value}
good = Query(OP_VALUE_GE, value_nb, value)
# Construct the variable end_value:
# end_value = the word "after" value: toto => totp
# Delete the '\xff' at the end of value
end_value = value
while end_value and ord(end_value[-1]) == 255:
end_value = end_value[:-1]
# Normal case: end_value is not empty
if end_value:
# The world after
end_value = end_value[:-1] + chr(ord(end_value[-1]) + 1)
# bad = {x / x >= end_value}
bad = Query(OP_VALUE_GE, value_nb, end_value)
# Return {x / x in good but x not in bad}
return Query(OP_AND_NOT, good, bad)
# If end_value is empty
else:
# Return {x / x in good}
return good
else:
# If value == '', we return everything
return Query('')
# TextQuery, the field must be indexed
if query_class is TextQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected %s for 'name'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
warn_not_indexed(name)
return Query()
info = metadata[name]
field_cls = _get_field_cls(name, fields, info)
try:
prefix = info['prefix']
except KeyError:
raise ValueError, 'the field "%s" must be indexed' % name
# Remove accents from the value
value = query.value
if type(value) is not unicode:
raise TypeError, "unexpected %s for 'value'" % type(value)
value = value.translate(TRANSLATE_MAP)
qp = QueryParser()
qp.set_database(self._db)
return qp.parse_query(_encode(field_cls, value), TQ_FLAGS, prefix)
i2x = self._query2xquery
# Multiple query with single atom
if isinstance(query, _MultipleQuery) and len(query.atoms) == 1:
return i2x(query.atoms[0])
# And
if query_class is _AndQuery:
return Query(OP_AND, [ i2x(q) for q in query.atoms ])
# Or
if query_class is _OrQuery:
return Query(OP_OR, [ i2x(q) for q in query.atoms ])
# Not
if query_class is NotQuery:
return Query(OP_AND_NOT, Query(''), i2x(query.query))
class Catalog(object):
def __init__(self, ref, fields, read_only=False, asynchronous_mode=True):
# Load the database
if isinstance(ref, Database) or isinstance(ref, WritableDatabase):
self._db = ref
else:
path = lfs.get_absolute_path(ref)
if read_only:
self._db = Database(path)
else:
self._db = WritableDatabase(path, DB_OPEN)
db = self._db
self._asynchronous = asynchronous_mode
self._fields = fields
# Asynchronous mode
if not read_only and asynchronous_mode:
db.begin_transaction(False)
# Load the xfields from the database
self._metadata = {}
self._key_field = None
self._value_nb = 0
self._prefix_nb = 0
self._load_all_internal()
#######################################################################
# API / Public / Transactions
#######################################################################
def save_changes(self):
"""Save the last changes to disk.
"""
if not self._asynchronous:
raise ValueError, "The transactions are synchronous"
db = self._db
db.commit_transaction()
db.flush()
db.begin_transaction(False)
def abort_changes(self):
"""Abort the last changes made in memory.
"""
if not self._asynchronous:
raise ValueError, "The transactions are synchronous"
db = self._db
db.cancel_transaction()
self._load_all_internal()
db.begin_transaction(False)
#######################################################################
# API / Public / (Un)Index
#######################################################################
def index_document(self, document):
"""Add a new document.
"""
db = self._db
metadata = self._metadata
fields = self._fields
# Check the input
if type(document) is dict:
doc_values = document
elif isinstance(document, CatalogAware):
doc_values = document.get_catalog_values()
else:
raise ValueError, 'the document must be a CatalogAware object'
# Make the xapian document
metadata_modified = False
xdoc = Document()
for name, value in doc_values.iteritems():
field_cls = fields[name]
# New field ?
if name not in metadata:
info = metadata[name] = self._get_info(field_cls, name)
metadata_modified = True
else:
info = metadata[name]
# A multilingual value ?
if isinstance(value, dict):
for language, lang_value in value.iteritems():
lang_name = name + '_' + language
# New field ?
if lang_name not in metadata:
lang_info = self._get_info(field_cls, lang_name)
lang_info['from'] = name
metadata[lang_name] = lang_info
metadata_modified = True
else:
lang_info = metadata[lang_name]
# The value can be None
if lang_value is not None:
# Is stored ?
if 'value' in lang_info:
xdoc.add_value(lang_info['value'],
_encode(field_cls, lang_value))
# Is indexed ?
if 'prefix' in lang_info:
# Comment: Index twice
_index(xdoc, field_cls, lang_value,
info['prefix'], language)
_index(xdoc, field_cls, lang_value,
lang_info['prefix'], language)
# The value can be None
elif value is not None:
# Is stored ?
if 'value' in info:
xdoc.add_value(info['value'], _encode(field_cls, value))
# Is indexed ?
if 'prefix' in info:
# By default language='en'
_index(xdoc, field_cls, value, info['prefix'], 'en')
# Store the key field with the prefix 'Q'
# Comment: the key field is indexed twice, but we must do it
# one => to index (as the others)
# two => to index without split
# the problem is that "_encode != _index"
key_field = self._key_field
if (key_field is None or key_field not in doc_values or
doc_values[key_field] is None):
raise ValueError, 'the "key_field" value is compulsory'
data = _reduce_size(_encode(fields[key_field], doc_values[key_field]))
xdoc.add_term('Q' + data)
# TODO: Don't store two documents with the same key field!
# Save the doc
db.add_document(xdoc)
# Store metadata ?
if metadata_modified:
db.set_metadata('metadata', dumps(metadata))
def unindex_document(self, value):
"""Remove the document that has value stored in its key_field.
If the document does not exist => no error
"""
key_field = self._key_field
if key_field is not None:
data = _reduce_size(_encode(self._fields[key_field], value))
self._db.delete_document('Q' + data)
#######################################################################
# API / Public / Search
#######################################################################
def search(self, query=None, **kw):
"""Launch a search in the catalog.
"""
xquery = _get_xquery(self, query, **kw)
return SearchResults(self, xquery)
def get_unique_values(self, name):
"""Return all the terms of a given indexed field
"""
metadata = self._metadata
# If there is a problem => an empty result
if name not in metadata:
return set()
# Ok
prefix = metadata[name]['prefix']
prefix_len = len(prefix)
return set([ t.term[prefix_len:] for t in self._db.allterms(prefix) ])
#######################################################################
# API / Private
#######################################################################
def _get_info(self, field_cls, name):
info = {}
# The key field ?
if getattr(field_cls, 'is_key_field', False):
if self._key_field is not None:
raise ValueError, ('You must have only one key field, '
'not multiple, not multilingual')
if not (field_cls.is_stored and field_cls.is_indexed):
raise ValueError, ('the key field must be stored '
'and indexed')
self._key_field = name
info['key_field'] = True
# Stored ?
if getattr(field_cls, 'is_stored', False):
info['value'] = self._value_nb
self._value_nb += 1
# Indexed ?
if getattr(field_cls, 'is_indexed', False):
info['prefix'] = _get_prefix(self._prefix_nb)
self._prefix_nb += 1
return info
def _load_all_internal(self):
"""Load the metadata from the database
"""
self._key_field = None
self._value_nb = 0
self._prefix_nb = 0
metadata = self._db.get_metadata('metadata')
if metadata == '':
self._metadata = {}
else:
self._metadata = loads(metadata)
for name, info in self._metadata.iteritems():
if 'key_field' in info:
self._key_field = name
if 'value' in info:
self._value_nb += 1
if 'prefix' in info:
self._prefix_nb += 1
def _query2xquery(self, query):
"""take a "itools" query and return a "xapian" query
"""
query_class = query.__class__
fields = self._fields
metadata = self._metadata
# All Query
if query_class is AllQuery:
return Query('')
# PhraseQuery, the field must be indexed
if query_class is PhraseQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected '%s'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
return Query()
info = metadata[name]
try:
prefix = info['prefix']
except KeyError:
raise ValueError, 'the field "%s" must be indexed' % name
field_cls = _get_field_cls(name, fields, info)
return _make_PhraseQuery(field_cls, query.value, prefix)
# RangeQuery, the field must be stored
if query_class is RangeQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected '%s'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
return Query()
info = metadata[name]
value = info['value']
field_cls = _get_field_cls(name, fields, info)
left = query.left
right = query.right
# Case 1: no limits, return everything
if left is None and right is None:
return Query('')
# Case 2: left limit only
if right is None:
return Query(OP_VALUE_GE, value, _encode(field_cls, left))
# Case 3: right limit only
if left is None:
return Query(OP_VALUE_LE, value, _encode(field_cls, right))
# Case 4: left and right
return Query(OP_VALUE_RANGE, value, _encode(field_cls, left),
_encode(field_cls, right))
# StartQuery, the field must be stored
if query_class is StartQuery:
name = query.name
if type(name) is not str:
raise TypeError, "unexpected '%s'" % type(name)
# If there is a problem => an empty result
if name not in metadata:
return Query()
info = metadata[name]
value_nb = info['value']
field_cls = _get_field_cls(name, fields, info)
value = query.value
value = _encode(field_cls, value)
if value:
# good = {x / x >= value}
good = Query(OP_VALUE_GE, value_nb, value)
# Construct the variable end_value:
# end_value = the word "after" value: toto => totp
# Delete the '\xff' at the end of value
end_value = value
while end_value and ord(end_value[-1]) == 255:
end_value = end_value[:-1]
# Normal case: end_value is not empty
if end_value:
# The world after
end_value = end_value[:-1] + chr(ord(end_value[-1]) + 1)
# bad = {x / x >= end_value}
bad = Query(OP_VALUE_GE, value_nb, end_value)
# Return {x / x in good but x not in bad}
return Query(OP_AND_NOT, good, bad)
# If end_value is empty
else:
# Return {x / x in good}
return good
else:
# If value == '', we return everything
return Query('')
# And
i2x = self._query2xquery
if query_class is AndQuery:
return Query(OP_AND, [ i2x(q) for q in query.atoms ])
# Or
if query_class is OrQuery:
return Query(OP_OR, [ i2x(q) for q in query.atoms ])
# Not
if query_class is NotQuery:
return Query(OP_AND_NOT, Query(''), i2x(query.query))