<h1 id="adapter-pattern">Adapter Pattern<a aria-hidden="true" class="anchor-heading icon-link" href="#adapter-pattern"></a></h1>
An adapter is a wrapper that converts the interface of an existing class into another interface that would be expected by a different client. It is a way of bridging the gap between incompatible interfaces.
<ul>
<li>It is often used to make existing classes work with others without modifying their source code.</li>
<li>ex. the <a href="/notes/nMCtMXVvjBsJk3iw1zoIO">Browser</a> uses an adapter to convert the interface of a <a href="/notes/OVODP7MLQgGI0WohlQEk3">DOM</a> of an XML document into a tree that can be displayed.</li>
</ul>
Anal: we have adapters for electrical sockets when visiting foreign countries. These bridge the gap between 2 interfaces that are incompatible with one another 
An adapter may also be known as a wrapper, though that name may also refer to a <a href="/notes/UxzKopcw8JCSnPc8HKbjX">decorator</a>.
An adapter allows two incompatible interfaces to work together. It does this by converting the interface of one class into an interface expected by the clients.
<ul>
<li>Interfaces may be incompatible, but the inner functionality should suit the need. </li>
</ul>
The adapter design pattern solves problems like:
<ul>
<li>How can a class be reused that does not have an interface that a client requires?</li>
<li>How can classes that have incompatible interfaces work together?</li>
<li>How can an alternative interface be provided for a class?</li>
</ul>
Often an (already existing) class can't be reused only because its interface doesn't conform to the interface clients require. The adapter design pattern describes how to solve such problems:
<ul>
<li>Define a separate adapter class that converts the (incompatible) interface of a class (adaptee) into another interface (target) clients require.</li>
<li>Work through an adapter to work with (reuse) classes that do not have the required interface.</li>
</ul>
The key idea in this pattern is to work through a separate adapter that adapts the interface of an (already existing) class without changing it.
<hr>
Backlinks
<ul>
<li><a href="/notes/8sahxg5gjs14yzwx9b77p1k">PouchDB</a></li>
<li><a href="/notes/xyqhj8bvi93yhoycfp3twpz">Hexagonal</a></li>
<li><a href="/notes/kMwvXFTpffr1BEHPDFd5k">Data Source</a></li>
<li><a href="/notes/zkuzes20sukgvhncv0ptjpt">Facade</a></li>
<li><a href="/notes/UxzKopcw8JCSnPc8HKbjX">Decorator Pattern</a></li>
</ul>

Adapter Pattern

tech

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For instance, Git itself is a domain. Sub-domains of Git would include topics like `commit`,
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This wiki has been written with myself in mind. While learning each of these
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As a result, I have allowed myself to use potentially arcane concepts to help
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I have made reference to the [[microservices|general.arch.microservice]] note.
The ability to analogize between different concepts captured in different notes
allows an opportunity to build strong generalized understandings. Given that
you'd have to understand microservices to be able to draw that same parallel
that I've already drawn, these links won't work for everyone. Since these notes
are written for myself, I have been fine with taking these liberties and leaning
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What I hope to gain from this wiki is the ability to step away from any
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## Tags
Throughout the garden, I have made use of tags, which give semantic meaning to the pieces of information.

- `ex.` - Denotes an *example* of the preceding piece of information
- `spec:` - Specifies that the preceding information has some degree of *speculation* to it, and may not be 100% factual. Ideally this gets clarified over time as my understanding develops. I try to go back after I have better understood the topic and clear out the notes of `spec:` tags
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## Resources
### UE (Unexamined) Resources
Often, I come across sources of information that I believe to be high-quality. They may be recommendations or found in some other way. No matter their origin, I may be in a position where I don't have the time to fully examine them (and properly extract notes), or I may not require the information at that moment in time. In cases like these, I will add reference to a section of the note called **UE Resources**. The idea is that in the future when I am ready to examine them, I have a list of resources that I can start with. This is an alternative strategy to compiling browser bookmarks, which I've found can quickly become untenable.

### E (Examined) Resources
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### Resources
This heading is for inexhaustible resources. 
- A prime example would be a quality website that continually posts articles.  - Another example would be a tool, such as software that measures frequencies in a room to help acoustically treat it.
