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POMaking abstract classes invisible; or: hiding my BananaHuman
 

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    <p><strong>Background:</strong> I am still a C# novice and this is my first big project with inheritance. The following story is a simplified example of my current situation:</p> <p>Suppose I have a class called <code>LivingOrganism</code>. Every living creature can use this class as base and inherit the functionality that is common to all living organisms.</p> <p>When I was working on some of these <code>derived</code> classes, I found out that bananas and humans <strong><a href="http://www.nhm.ac.uk/nature-online/evolution/what-is-the-evidence/morphology/dna-molecules/" rel="nofollow noreferrer">are very similar</a></strong>. Although it doesn't make much sense and they look nothing alike, they apparently have most of their "functionality" in common.</p> <p>Duplication in code is bad, so I wrote a new class to reduce maintenance costs. This class is called: <code>BananaHuman</code>. My <code>Human</code> class and <code>Banana</code> class inherit from <code>BananaHuman</code>.</p> <hr> <p><strong>Problem:</strong></p> <p>I have no problem with my BananaHuman (i.e. I understand what it means and why it exists). But eventually, other people (even those who don't (fully) understand inheritance) will have to use my <em>LivingCreatures.dll</em>. And they won't understand why <em>intellisense</em> suggests BananaHuman when they type 'B'. </p> <p>And consider the following piece of code:</p> <pre><code>//Valid and makes sense. foreach(LivingOrganism foo in cityOfNeyYork) { /*embedded statement*/ } </code></pre> <p>But imagine how weird/confusing it would look if we substitute <code>Living Organism</code> with <code>BananaHuman</code>.</p> <p>I can't make <code>BananaHuman</code> <code>private</code>, <code>protected</code> or <code>protected internal</code> (Elements defined in a namespace cannot be explicitly declared that way). I also can't make it <code>internal</code>, because <code>Human</code> and <code>Banana</code> <strong>have</strong> to be <code>public</code>. If I try this, I get an error message saying there is an <code>inconsistent accessibility</code> issue.</p> <p>I feel like I am missing the obvious, but what can/should I do? I am left with a couple of options/questions:</p> <ol> <li>Is it possible to "hide" <code>BananaHuman</code> to avoid confusion? </li> <li>Should I rewrite <code>BananaHuman</code> to something very long and technical such as <code>DnaRelatedOrganismsType[X]</code>, where "X" describes their unique relation? </li> <li>Should I just delete <code>BananaHuman</code>, let <code>Human</code> and <code>Banana</code> inherit from <code>LivingOrganism</code> and do the extra maintenance when something needs changing? </li> <li>Is there another solution I am completely missing?</li> </ol> <p>I searched around and couldn't quite find a <strong>"fixed pattern"</strong> for this situation. I found <a href="https://stackoverflow.com/questions/10698020/how-to-hide-the-entire-class">this</a> question with a similar title, but I don't know if the answers are applicable because it appears that he is asking something completely different. </p> <p>Any help is greatly appreciated!</p>
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