[Zope-Checkins] CVS: Zope2 - FieldIndex.py:1.1.2.1
andreas@digicool.com
andreas@digicool.com
Mon, 14 May 2001 14:54:54 -0400 (EDT)
Update of /cvs-repository/Zope2/lib/python/Products/PluginIndexes/FieldIndex
In directory korak.digicool.com:/tmp/cvs-serv26272/FieldIndex
Added Files:
Tag: ajung-dropin-registry
FieldIndex.py
Log Message:
added
--- Added File FieldIndex.py in package Zope2 ---
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"""Simple column indices"""
__version__='$Revision: 1.1.2.1 $'[11:-2]
from Globals import Persistent
from Acquisition import Implicit
import BTree
import IOBTree
import string
from zLOG import LOG, ERROR
from types import StringType, ListType, IntType, TupleType
from BTrees.OOBTree import OOBTree, OOSet
from BTrees.IOBTree import IOBTree
from BTrees.IIBTree import IITreeSet, IISet, union
import BTrees.Length
from Products.PluginIndexes import PluggableIndex ,UnIndex
from Globals import Persistent, DTMLFile
from Acquisition import Implicit
from OFS.History import Historical
from OFS.SimpleItem import SimpleItem
import sys
_marker = []
class FieldIndex(PluggableIndex.PluggableIndex, Persistent,
Implicit, SimpleItem):
"""Field Indexes"""
__implements__ = (PluggableIndex.PluggableIndexInterface,)
meta_type="FieldIndex"
manage_options= (
SimpleItem.manage_options
)
def __init__(self, id, ignore_ex=None, call_methods=None):
"""Create an unindex
UnIndexes are indexes that contain two index components, the
forward index (like plain index objects) and an inverted
index. The inverted index is so that objects can be unindexed
even when the old value of the object is not known.
e.g.
self._index = {datum:[documentId1, documentId2]}
self._unindex = {documentId:datum}
If any item in self._index has a length-one value, the value is an
integer, and not a set. There are special cases in the code to deal
with this.
The arguments are:
'id' -- the name of the item attribute to index. This is
either an attribute name or a record key.
'ignore_ex' -- should be set to true if you want the index
to ignore exceptions raised while indexing instead of
propagating them.
'call_methods' -- should be set to true if you want the index
to call the attribute 'id' (note: 'id' should be callable!)
You will also need to pass in an object in the index and
uninded methods for this to work.
"""
self.id = id
self.ignore_ex=ignore_ex # currently unimplimented
self.call_methods=call_methods
self.__len__=BTrees.Length.Length() # see __len__ method docstring
self.clear()
def clear(self):
# inplace opportunistic conversion from old-style to new style BTrees
try: self.__len__.set(0)
except AttributeError: self.__len__=BTrees.Length.Length()
self._index = OOBTree()
self._unindex = IOBTree()
def _convertBTrees(self, threshold=200):
if type(self._index) is OOBTree: return
from BTrees.convert import convert
_index=self._index
self._index=OOBTree()
def convertSet(s,
IITreeSet=IITreeSet, IntType=type(0),
type=type, len=len,
doneTypes = (IntType, IITreeSet)):
if type(s) in doneTypes: return s
if len(s) == 1:
try: return s[0] # convert to int
except: pass # This is just an optimization.
return IITreeSet(s)
convert(_index, self._index, threshold, convertSet)
_unindex=self._unindex
self._unindex=IOBTree()
convert(_unindex, self._unindex, threshold)
self.__len__=BTrees.Length.Length(len(_index))
def __nonzero__(self):
return not not self._unindex
def __len__(self):
"""Return the number of objects indexed.
This method is only called for indexes which have "old" BTrees,
and the *only* reason that UnIndexes maintain a __len__ is for
the searching code in the catalog during sorting.
"""
return len(self._unindex)
def histogram(self):
"""Return a mapping which provides a histogram of the number of
elements found at each point in the index."""
histogram = {}
for item in self._index.items():
if type(item) is IntType:
entry = 1 # "set" length is 1
else:
key, value = item
entry = len(value)
histogram[entry] = histogram.get(entry, 0) + 1
return histogram
def referencedObjects(self):
"""Generate a list of IDs for which we have referenced objects."""
return self._unindex.keys()
def getEntryForObject(self, documentId, default=_marker):
"""Takes a document ID and returns all the information we have
on that specific object."""
if default is _marker:
return self._unindex.get(documentId)
else:
return self._unindex.get(documentId, default)
def removeForwardIndexEntry(self, entry, documentId):
"""Take the entry provided and remove any reference to documentId
in its entry in the index."""
global _marker
indexRow = self._index.get(entry, _marker)
if indexRow is not _marker:
try:
indexRow.remove(documentId)
if not indexRow:
del self._index[entry]
try: self.__len__.change(-1)
except AttributeError: pass # pre-BTrees-module instance
except AttributeError:
# index row is an int
del self._index[entry]
try: self.__len__.change(-1)
except AttributeError: pass # pre-BTrees-module instance
except:
LOG(self.__class__.__name__, ERROR,
('unindex_object could not remove '
'documentId %s from index %s. This '
'should not happen.'
% (str(documentId), str(self.id))), '',
sys.exc_info())
else:
LOG(self.__class__.__name__, ERROR,
('unindex_object tried to retrieve set %s '
'from index %s but couldn\'t. This '
'should not happen.' % (repr(entry), str(self.id))))
def insertForwardIndexEntry(self, entry, documentId):
"""Take the entry provided and put it in the correct place
in the forward index.
This will also deal with creating the entire row if necessary."""
global _marker
indexRow = self._index.get(entry, _marker)
# Make sure there's actually a row there already. If not, create
# an IntSet and stuff it in first.
if indexRow is _marker:
self._index[entry] = documentId
try: self.__len__.change(1)
except AttributeError: pass # pre-BTrees-module instance
else:
try: indexRow.insert(documentId)
except AttributeError:
# index row is an int
indexRow=IITreeSet((indexRow, documentId))
self._index[entry] = indexRow
def index_object(self, documentId, obj, threshold=None):
""" index and object 'obj' with integer id 'documentId'"""
global _marker
returnStatus = 0
# First we need to see if there's anything interesting to look at
# self.id is the name of the index, which is also the name of the
# attribute we're interested in. If the attribute is callable,
# we'll do so.
try:
datum = getattr(obj, self.id)
if callable(datum):
datum = datum()
except AttributeError:
datum = _marker
# We don't want to do anything that we don't have to here, so we'll
# check to see if the new and existing information is the same.
oldDatum = self._unindex.get(documentId, _marker)
if datum != oldDatum:
if oldDatum is not _marker:
self.removeForwardIndexEntry(oldDatum, documentId)
if datum is not _marker:
self.insertForwardIndexEntry(datum, documentId)
self._unindex[documentId] = datum
returnStatus = 1
return returnStatus
def unindex_object(self, documentId):
""" Unindex the object with integer id 'documentId' and don't
raise an exception if we fail """
global _marker
unindexRecord = self._unindex.get(documentId, _marker)
if unindexRecord is _marker:
return None
self.removeForwardIndexEntry(unindexRecord, documentId)
try:
del self._unindex[documentId]
except:
LOG('UnIndex', ERROR, 'Attempt to unindex nonexistent document'
' with id %s' % documentId)
def _apply_index(self, request, cid='', type=type, None=None):
"""Apply the index to query parameters given in the request arg.
The request argument should be a mapping object.
If the request does not have a key which matches the "id" of
the index instance, then None is returned.
If the request *does* have a key which matches the "id" of
the index instance, one of a few things can happen:
- if the value is a blank string, None is returned (in
order to support requests from web forms where
you can't tell a blank string from empty).
- if the value is a nonblank string, turn the value into
a single-element sequence, and proceed.
- if the value is a sequence, return a union search.
If the request contains a parameter with the name of the
column + '_usage', it is sniffed for information on how to
handle applying the index.
If None is not returned as a result of the abovementioned
constraints, two objects are returned. The first object is a
ResultSet containing the record numbers of the matching
records. The second object is a tuple containing the names of
all data fields used.
FAQ answer: to search a Field Index for documents that
have a blank string as their value, wrap the request value
up in a tuple ala: request = {'id':('',)}
"""
id = self.id #name of the column
cidid = "%s/%s" % (cid,id)
# i have no f'ing clue what this cdid stuff is for - chrism
if request.has_key(cidid):
keys = request[cidid]
elif request.has_key(id):
keys = request[id]
else:
return None
if type(keys) not in (ListType, TupleType):
if keys == '':
return None
else:
keys = [keys]
index = self._index
r = None
opr = None
if request.has_key(id+'_usage'):
# see if any usage params are sent to field
opr=string.split(string.lower(request[id+"_usage"]),':')
opr, opr_args=opr[0], opr[1:]
if opr=="range": # range search
if 'min' in opr_args: lo = min(keys)
else: lo = None
if 'max' in opr_args: hi = max(keys)
else: hi = None
if hi:
setlist = index.items(lo,hi)
else:
setlist = index.items(lo)
for k, set in setlist:
if type(set) is IntType:
set = IISet((set,))
r = union(r, set)
else: # not a range search
for key in keys:
set=index.get(key, None)
if set is not None:
if type(set) is IntType:
set = IISet((set,))
r = union(r, set)
if type(r) is IntType: r=IISet((r,))
if r is None:
return IISet(), (id,)
else:
return r, (id,)
def hasUniqueValuesFor(self, name):
' has unique values for column NAME '
if name == self.id:
return 1
else:
return 0
def uniqueValues(self, name=None, withLengths=0):
"""\
returns the unique values for name
if withLengths is true, returns a sequence of
tuples of (value, length)
"""
if name is None:
name = self.id
elif name != self.id:
return []
if not withLengths:
return tuple(self._index.keys())
else:
rl=[]
for i in self._index.keys():
set = self._index[i]
if type(set) is IntType:
l = 1
else:
l = len(set)
rl.append((i, l))
return tuple(rl)
def keyForDocument(self, id):
return self._unindex[id]
def items(self):
items = []
for k,v in self._index.items():
if type(v) is IntType:
v = IISet((v,))
items.append((k, v))
return items
index_html = DTMLFile('dtml/index', globals())
manage_workspace = DTMLFile('dtml/manageFieldIndex', globals())
manage_addFieldIndexForm = DTMLFile('dtml/addFieldIndex', globals())
def manage_addFieldIndex(self, id, REQUEST=None, submit=None):
"""Add a field index"""
return self.manage_addIndex(id, 'FieldIndex', REQUEST)