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| <td class="back"><a id="top"></a><a href="s1.5.d.html" rel="prev"><< §1.5.(d) Prohibition of name clashes</a></td> |
| <td class="top"><a href="index.html" rel="contents">↑ Table of Contents ↑</a></td> |
| <td class="next"><a href="s1.5.f.html" rel="next">§1.5.(f) Qualified tsuper >></a></td> |
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| <div class="breadcrumb"><a class="nav" href="s1.html" rel="section">§1 Teams and Roles</a> > <a class="nav" href="s1.5.html" rel="section">§1.5 Team and role nesting</a></div> |
| <div class="subsect depth3" id="s1.5.e"> |
| <h4 class="subsect">§1.5.(e) <span class="title">Precedence among different supers</span><a class="img" href="s1.5.e.html" |
| title="PermaLink to (e) Precedence among different supers"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
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| <p>If a role inherits the same feature from several super roles (super and tsuper), |
| an implicitly inherited version always overrides any explicitly inherited feature, |
| i.e., a role with the same simple name is closer related than one with a different name. |
| </p> |
| <p> |
| Also implicit inheritance alone may produce several candidate methods inherited by a role class. |
| This is a result of team-nesting where each level of nesting may add one more tsuper role |
| if outer teams also participate in an inheritance relationship. |
| In this case a role inherited from an <em>implicit</em> super team of the enclosing team |
| is closer related than a role inherited from an <em>explicit</em> super team. |
| If necessary this rule is applied inside out until a nesting level is found where indeed |
| explicit team inheritance is involved.<br /> |
| So when comparing classes by their fully qualified names |
| the longest common suffix will determine the closest relationship. |
| E.g., <code>SuperOuter.RoleAndTeamSub.InnerRole</code> |
| is the closest ancestor of <code>SubOuter.RoleAndTeamSub.InnerRole</code> |
| because both share the name suffix <code>RoleAndTeamSub.InnerRole</code>. |
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| <p>In the above example (<a href="s1.html#l1.5" class="listing">Listing 1.5</a>) role <code class="small">OuterTeam.RoleAndTeamSub.InnerRole</code> |
| has two direct tsuper roles: |
| <code class="small">OuterTeam.RoleAndTeam.InnerRole</code> and <code class="small">SuperOuter.RoleAndTeamSub.InnerRole</code>. |
| Without the method <code>foo</code> defined in lines 27-30, the enclosing class <code class="small">OuterTeam.RoleAndTeamSub.InnerRole</code> |
| would inherit the method <code>foo</code> defined in <code>SuperOuter.RoleAndTeamSub.InnerRole</code> (line 9), |
| because the common name suffix <code>RoleAndTeamSub.InnerRole</code> |
| creates a stronger relationship making that class the closest ancestor. |
| </p> |
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| <td rowspan="1" colspan="1"><img src="../images/team_nesting_hor.png" alt="Example diagram team nesting" /></td> |
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| <td class="back"><a href="s1.5.d.html" rel="prev"><< §1.5.(d) Prohibition of name clashes</a></td> |
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| <td class="next"><a href="s1.5.f.html" rel="next">§1.5.(f) Qualified tsuper >></a></td> |
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| <div class="breadcrumb"><a class="nav" href="s1.html" rel="section">§1 Teams and Roles</a> > <a class="nav" href="s1.5.html" rel="section">§1.5 Team and role nesting</a></div> |
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