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Analysis

The goal of this task is to review/refactor the org.sophie2.base.commons.structure's classes - so called immutable collections. There are several reported problems and possible improvements in the classes:

1. Quite complex constructing of ImmCollections - This is due inner implementation of tree structure::

solution: create several factory method for the specific collections - there can be hashing or non-hashing collection, also with or without iterator.

2. There is no easy method for creating an immutable collection of another collection - Now, it mostly done by adding element by element in new collection::

solution: create method which by a given collection constructs an immutable collection. (investigate for faster creating in specific cases.

3. Need of faster iterators - Interators in this moments are needed to be faster.

solution: investigate for way to improve iterators.

4. Missing indexOf(...) method - There is need for such method, mainly by text usage.

solution: make apropriate method.

5. Slow foreach

solution: investigate for way to improve performance of foreach.

6. Bug: get(K) throws exception when K is missing

solution: make it returns null instead of exception.

Overview

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Task requirements

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Task result

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Implementation idea

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Related

IMMUTABLE_TREE_R0

How to demo

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Design

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Implementation

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Testing

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Comments

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