bucket-filter 0.5

Bucket Filter

A filtering library to present data that matches a series of conditional expressions

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Bucket filter is a python library that allows creating multiple buckets each linked to a condition and having various data, each identified by a unique ID. It then allows for combining various buckets in a serious of conditinal operators and filters out those IDs that match a given expression.

• Currently supported operators is &(AND), ||(OR)
• The library currenly only supports Boolean expressions

Example

Lets say there are 3 buckets with conditions c1, c2, c3 as defined below

1. c1 –> id1, id2, id3
2. c2 –> id3, id4, id5
3. c3 –> id2, id3, id6

an expression

C = c1 & (c2 || c3)

would result in

==> C = (id1, id2, id3) & (id3, id4, id5 id2, id6)

==> C = (id2, id3)

NOTE

1. The library does not evaluate individual conditions, only joins the filters as defined by the expression
   • The library does an exact expression match, so if while registering one uses hasData=True, the library expects the same expression when evaluating
2. Standard evaluation rules apply, left to right, expressions in braces are done first
3. Elements in the bucket MUST have a accessible attribute id else will be evicted out of the bucket

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License

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.