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| <title>OT/J Language Definition v1.3</title> |
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| <td class="back"><a id="top"></a><a href="s3.4.c.html" rel="prev"><< §3.4.(c) Warning levels</a></td> |
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| <div class="breadcrumb"><a class="nav" href="s3.html" rel="section">§3 Callout Binding</a> > <a class="nav" href="s3.4.html" rel="section">§3.4 Overriding access restrictions</a></div> |
| <div class="subsect depth3" id="s3.4.d"> |
| <h4 class="subsect">§3.4.(d) <span class="title">Private methods from super classes</span><a class="img" href="s3.4.d.html" |
| title="PermaLink to (d) Private methods from super classes"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
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| <p>If a callout binding shall bind to a private base method, that method |
| must be defined in the exact base class to which the current role |
| class is bound using <code>playedBy</code>. I.e., for private methods |
| <a href="s3.1.d.html" |
| title="§3.1.(d) Inheritance of role method declarations" |
| class="sect">§3.1.(d)</a> does not hold. |
| <br /> |
| The same holds for private base fields (see below). |
| <br /> |
| If a private base feature must indeed be callout-bound, a role class |
| must be defined that is played by the exact base class defining the |
| private feature. Another role bound to a sub-base-class can then |
| be defined as a sub class of the first role. It will inherit the |
| callout binding and through this it can access the desired feature. |
| |
| </p> |
| <div class="listing example frame"> |
| <table class="listing"> |
| <tr class="line odd"> |
| <td class="ln">1</td> |
| <td><pre><b>public</b> <b>class</b> SuperBase {</pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">2</td> |
| <td><pre> <em><b>private</b> <b>int</b> secret;</em></pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">3</td> |
| <td><pre>}</pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">4</td> |
| <td><pre><b>public</b> <b>class</b> SubBase <b>extends</b> SuperBase { <span class="comment">/* details omitted */</span> }</pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">5</td> |
| <td><pre><b>public</b> <b>team</b> <b>class</b> MyTeam {</pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">6</td> |
| <td><pre> <b>protected</b> <b>class</b> SuperRole <b>playedBy</b> SuperBase {</pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">7</td> |
| <td><pre> <b>int</b> steal() <b>-></b> <b>get</b> <b>int</b> <em>secret</em>; <span class="comment">// <span class="green"><strong>OK</strong></span></span></pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">8</td> |
| <td><pre> }</pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">9</td> |
| <td><pre> <b>protected</b> <b>class</b> SubRole <b>extends</b> SuperRole <b>playedBy</b> SubBase {</pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">10</td> |
| <td><pre> <b>int</b> steal() <b>-></b> <b>get</b> <b>int</b> <em>secret</em>; <span class="comment">// <span class="error"><strong>illegal!</strong></span></span></pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">11</td> |
| <td><pre> }</pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">12</td> |
| <td><pre>}</pre></td> |
| </tr> |
| </table> |
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| <td class="back"><a href="s3.4.c.html" rel="prev"><< §3.4.(c) Warning levels</a></td> |
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| width="88" /></a><address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
| OT/J version 1.3 — last modified: 2011-05-15 |
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