home *** CD-ROM | disk | FTP | other *** search
- ##############################################################################
- #
- # Zope Public License (ZPL) Version 1.0
- # -------------------------------------
- #
- # Copyright (c) Digital Creations. All rights reserved.
- #
- # This license has been certified as Open Source(tm).
- #
- # Redistribution and use in source and binary forms, with or without
- # modification, are permitted provided that the following conditions are
- # met:
- #
- # 1. Redistributions in source code must retain the above copyright
- # notice, this list of conditions, and the following disclaimer.
- #
- # 2. Redistributions in binary form must reproduce the above copyright
- # notice, this list of conditions, and the following disclaimer in
- # the documentation and/or other materials provided with the
- # distribution.
- #
- # 3. Digital Creations requests that attribution be given to Zope
- # in any manner possible. Zope includes a "Powered by Zope"
- # button that is installed by default. While it is not a license
- # violation to remove this button, it is requested that the
- # attribution remain. A significant investment has been put
- # into Zope, and this effort will continue if the Zope community
- # continues to grow. This is one way to assure that growth.
- #
- # 4. All advertising materials and documentation mentioning
- # features derived from or use of this software must display
- # the following acknowledgement:
- #
- # "This product includes software developed by Digital Creations
- # for use in the Z Object Publishing Environment
- # (http://www.zope.org/)."
- #
- # In the event that the product being advertised includes an
- # intact Zope distribution (with copyright and license included)
- # then this clause is waived.
- #
- # 5. Names associated with Zope or Digital Creations must not be used to
- # endorse or promote products derived from this software without
- # prior written permission from Digital Creations.
- #
- # 6. Modified redistributions of any form whatsoever must retain
- # the following acknowledgment:
- #
- # "This product includes software developed by Digital Creations
- # for use in the Z Object Publishing Environment
- # (http://www.zope.org/)."
- #
- # Intact (re-)distributions of any official Zope release do not
- # require an external acknowledgement.
- #
- # 7. Modifications are encouraged but must be packaged separately as
- # patches to official Zope releases. Distributions that do not
- # clearly separate the patches from the original work must be clearly
- # labeled as unofficial distributions. Modifications which do not
- # carry the name Zope may be packaged in any form, as long as they
- # conform to all of the clauses above.
- #
- #
- # Disclaimer
- #
- # THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS ``AS IS'' AND ANY
- # EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL CREATIONS OR ITS
- # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- # SUCH DAMAGE.
- #
- #
- # This software consists of contributions made by Digital Creations and
- # many individuals on behalf of Digital Creations. Specific
- # attributions are listed in the accompanying credits file.
- #
- ##############################################################################
-
- """Simple column indices"""
- __version__='$Revision: 1.26 $'[11:-2]
-
- from Globals import Persistent
- from BTree import BTree
- from intSet import intSet
- import operator
- from Missing import MV
- import string
-
- ListType=type([])
- StringType=type('s')
-
-
- def nonEmpty(s):
- "returns true if a non-empty string or any other (nonstring) type"
- if type(s) is StringType:
- if s: return 1
- else: return 0
- else:
- return 1
-
-
- class Index(Persistent):
- """Index object interface"""
-
- def __init__(self, data=None, schema=None, id=None,
- ignore_ex=None, call_methods=None):
- """Create an index
-
- The arguments are:
-
- 'data' -- a mapping from integer object ids to objects or
- records,
-
- 'schema' -- a mapping from item name to index into data
- records. If 'data' is a mapping to objects, then schema
- should ne 'None'.
-
- 'id' -- the name of the item attribute to index. This is
- either an attribute name or a record key.
-
- """
- ######################################################################
- # For b/w compatability, have to allow __init__ calls with zero args
-
- if not data==schema==id==ignore_ex==call_methods==None:
- self._data = data
- self._schema = schema
- self.id = id
- self.ignore_ex=ignore_ex
- self.call_methods=call_methods
- self._index = BTree()
-
- self._reindex()
- else:
- pass
-
- # for b/w compatability
- _init = __init__
-
-
- def dpHasUniqueValuesFor(self, name):
- ' has unique values for column NAME '
- if name == self.id:
- return 1
- else:
- return 0
-
-
- def dpUniqueValues(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(
- filter(nonEmpty,self._index.keys())
- )
- else:
- rl=[]
- for i in self._index.keys():
- if not nonEmpty(i): continue
- else: rl.append((i, len(self._index[i])))
- return tuple(rl)
-
-
- def clear(self):
- self._index = BTree()
-
-
- def _reindex(self, start=0):
- """Recompute index data for data with ids >= start."""
-
- index=self._index
- get=index.get
-
- if not start: index.clear()
-
- id = self.id
- if self._schema is None:
- f=getattr
- else:
- f = operator.__getitem__
- id = self._schema[id]
-
- for i,row in self._data.items(start):
- k=f(row,id)
-
- if k is None or k == MV: continue
-
- set=get(k)
- if set is None: index[k] = set = intSet()
- set.insert(i)
-
-
- def index_item(self, i, obj=None):
- """Recompute index data for data with ids >= start."""
- index = self._index
- id = self.id
- if (self._schema is None) or (obj is not None):
- f = getattr
- else:
- f = operator.__getitem__
- id = self._schema[id]
-
- if obj is None:
- obj = self._data[i]
-
- try: k=f(obj, id)
- except: return
- if self.call_methods:
- k=k()
- if k is None or k == MV:
- return
-
- set = index.get(k)
- if set is None: index[k] = set = intSet()
- set.insert(i)
-
-
- def unindex_item(self, i, obj=None):
- """Recompute index data for data with ids >= start."""
- index = self._index
- id = self.id
- if self._schema is None:
- f = getattr
- else:
- f = operator.__getitem__
- id = self._schema[id]
- if obj is None:
- obj = self._data[i]
-
- try: k=f(obj, id)
- except: return
- if self.call_methods:
- k=k()
- if k is None or k == MV:
- return
-
- set = index.get(k)
- if set is not None: set.remove(i)
-
-
- def _apply_index(self, request, cid=''):
- """Apply the index to query parameters given in the argument,
- request
-
- The argument should be a mapping object.
-
- If the request does not contain the needed parameters, then
- None is returned.
-
- 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.
-
- Otherwise 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.
-
- """
- id = self.id #name of the column
-
- cidid = "%s/%s" % (cid,id)
- has_key = request.has_key
- if has_key(cidid): keys = request[cidid]
- elif has_key(id): keys = request[id]
- else: return None
-
- if type(keys) is not ListType: keys=[keys]
- index = self._index
- r = None
- anyTrue = 0
- 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":
- if 'min' in opr_args: lo = min(keys)
- else: lo = None
- if 'max' in opr_args: hi = max(keys)
- else: hi = None
-
- anyTrue=1
- try:
- if hi: setlist = index.items(lo,hi)
- else: setlist = index.items(lo)
- for k,set in setlist:
- if r is None: r = set
- else: r = r.union(set)
- except KeyError: pass
- else: #not a range
- get = index.get
- for key in keys:
- if key: anyTrue = 1
- set=get(key)
- if set is not None:
- if r is None: r = set
- else: r = r.union(set)
-
- if r is None:
- if anyTrue: r=intSet()
- else: return None
-
- return r, (id,)
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-