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<a class="user-hover" rel="eerriicc" id="email_eerriicc" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=eerriicc" style="color:#6c797f;">Eric Lewis</a>
created <img src="https://hibernate.onjira.com/images/icons/newfeature.gif" height="16" width="16" border="0" align="absmiddle" alt="New Feature"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HV-686'>HV-686</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HV-686'><strong>Enhanced method parameter validation</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://hibernate.onjira.com/images/icons/newfeature.gif" height="16" width="16" border="0" align="absmiddle" alt="New Feature"> New Feature
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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Unassigned </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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30/Jan/13 6:33 AM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>Often a method parameter is actually the same as a property within a class, which already contains validation annotations.</p>
<p style='margin-top:0;margin-bottom:10px;'>So it would be a great feature to just let the method parameter validation point to that class and that property and let the validator use it.</p>
<p style='margin-top:0;margin-bottom:10px;'>Let's say you have a User class which contains an ID:</p>
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<pre class="code-java">@Nonnull
@Range(min = 1, max = 9999)
<span class="code-comment">// And some other validations
</span><span class="code-keyword">private</span> <span class="code-object">Integer</span> id;</pre>
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<p style='margin-top:0;margin-bottom:10px;'>And then you have a method which finds the user:</p>
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<pre class="code-java"><span class="code-keyword">public</span> User findUser(<span class="code-object">Integer</span> id) { ... }</pre>
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<p style='margin-top:0;margin-bottom:10px;'>Using the method validation, you can of course specify:</p>
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<pre class="code-java"><span class="code-keyword">public</span> User findUser(@Nonnull @Range(min = 1, max = 9999) <span class="code-object">Integer</span> id) { ... }</pre>
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<p style='margin-top:0;margin-bottom:10px;'>But that's a violation of the DRY principle, since the validation already exists in the User class.</p>
<p style='margin-top:0;margin-bottom:10px;'>That's the use case for <tt>@ValidProperty</tt>. It assumes that the parameter's name is identical to the property of the specified class and then uses that property's validation.</p>
<p style='margin-top:0;margin-bottom:10px;'>For instance:</p>
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<pre class="code-java"><span class="code-keyword">public</span> User findUser(@ValidProperty(User.class) <span class="code-object">Integer</span> id) { ... }</pre>
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<p style='margin-top:0;margin-bottom:10px;'>Of course, it should be possible to use a different parameter name, like:</p>
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<pre class="code-java"><span class="code-keyword">public</span> User findUser(@ValidProperty(value=User.class, property=<span class="code-quote">"id"</span>) <span class="code-object">Integer</span> userID) { ... }</pre>
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<p style='margin-top:0;margin-bottom:10px;'>The previous validation framework that we used, <a href="http://oval.sourceforge.net/">OVal</a>, had this feature and implemented it by weaving in the necessary code with AspectJ.</p>
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#6c797f;" href="https://hibernate.onjira.com/browse/HV">Hibernate Validator</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://hibernate.onjira.com/images/icons/priority_major.gif" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<a class="user-hover" rel="eerriicc" id="email_eerriicc" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=eerriicc" style="color:#6c797f;">Eric Lewis</a>
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