[Pharo-users] "Theming" dictionaries?

Richard Sargent richard.sargent at gemtalksystems.com
Wed Feb 19 12:08:20 EST 2020

See below.

On Wed, Feb 19, 2020 at 8:49 AM Offray Vladimir Luna Cárdenas <
offray.luna at mutabit.com> wrote:

> Hi,
> As some of you may know, I'm a "savage coder" who learned
> Smalltalk/Pharo by himself, of course thanks to communities, books and
> videos, but without formal training or peers in the same country and
> guided mostly by necessity. All this to say that this maybe kind of a
> silly question.
> Anyway, we have this project called Minipedia[1], that imports Wikipedia
> articles and their history. A Minipedia language there, is just a
> dictionary, where the key is the language two letters code and the value
> for each key is an array of article titles. There is any way to
> specialize a Dictionary to tell it, name your 'key' as language and your
> 'value' as 'titles'?

There are several ways, depending on your intention.

If you intend that the full Dictionary and Collection API is available to
all the places where this artefact will be used, you can add extensions to
the Dictionary class to provide alias accessing methods or you can also
subclass Dictionary and only have your aliases (and whatever API) visible
only to consumers of that class. The former is a quick and dirty approach.
The latter is better, since every Dictionary is NOT a language keyed
collection of article.

If you want to have a limited API, you wrap a dictionary with a new class
that exposes just the API you desire consumers to use.

In general, inheritance is often overused or/ misused. Composition is
usually a better technique unless you want the full API of the hierarchy to
be available and used.

> [1] https://mutabit.com/repos.fossil/minipedia/
> Thanks,
> Offray
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