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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11415" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-c9bf53c3-12f3-4fe9-96ec-affcf49361de" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11415" style="color: #3b73af; text-decoration: none">HHH-11415</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-11415" style="color: #3b73af; text-decoration: none">AttributeConverter: Only convert if the value is of the Java type (and not already of the database type). </a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Change By:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="marcg" id="email_marcg" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=marcg" style="color:#6c797f;; color: #3b73af; text-decoration: none">Marcelo Glasberg</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <span class="diffcontext">Suppose a `CreditcardNumb.class` with a constructor that checks if the</span> <span class="diffaddedchars" style="background-color:#ddfade;"> provided</span> <span class="diffcontext"> credit-card number is valid. <br><br>I then create a `CreditcardNumbConverter.class` to convert credit-card numbers to Strings in the database:<br><br>{code:java}<br>public class CreditcardnumbConverter<br> implements AttributeConverter<CreditcardNumb, String> {<br> <br> public String convertToDatabaseColumn(CreditcardNumb cn) {<br> if (cn== null) return null;<br> return cn.toString();<br> }<br> <br> public CreditcardNumb convertToEntityAttribute(String cn) {<br> if ((cn == null) || cn.trim().isEmpty()) return null;<br> return new CreditcardNumb(cn);<br> }<br> }<br>{code}<br><br>This works ok, but now I want to use the Criteria API</span> <span class="diffaddedchars" style="background-color:#ddfade;"> *</span> <span class="diffcontext"> (the new or the old API, doesn't matter)</span> <span class="diffaddedchars" style="background-color:#ddfade;">*</span> <span class="diffcontext"> to search for all credit-card numbers that start with "123":<br><br>{code:java}<br>CreditcardNumb cn = new CreditcardNumb("123");<br><br>createCriteria(Wallet.class)<br> .add(Restrictions.ilike("creditcard", cn, MatchMode.START))<br> .list();<br>{code}<br><br>However, since "123" is not a valid credit-card number, the object instantiation fails. Also, the ilike method doesn't accept CreditcardNumb objects, but only Strings.<br><br>There are two ways of solving this (I prefer the second):<br><br>1) Let us locally bypass or disable the conversion, so that I can do something like:<br><br>{code:java}<br>createCriteria(Wallet.class)<br> .disable(CreditcardnumbConverter.class))<br> .add(Restrictions.ilike("creditcard", "123", MatchMode.START))<br> .list();<br>{code}<br><br>2) But, better yet, simply check if the value is already of the database type, and if so, bypass the conversion (or else, check if the value is of the Java type, and only if so, do the conversion). <br><br>The exact place the Criteria fails (on Hibernate 5.2.7) is at *org.hibernate.type.descriptor.converter.AttributeConverterSqlTypeDescriptorAdapter, line 77*, where we get this exception:<br><br>{code:java}<br>java.lang.ClassCastException: java.lang.String cannot be cast to CreditcardNumb<br>{code}<br><br>The failing line is:<br><br>{code:java}<br>convertedValue = converter.convertToDatabaseColumn( value );<br>{code}<br><br>This could be changed to something along the lines of:<br><br>{code:java}<br>Class javaClass = intermediateJavaTypeDescriptor.getJavaTypeClass();<br>Class valueClass = value.getClass();<br>if (javaClass.isAssignableTo(valueClass()) { <br> convertedValue = converter.convertToDatabaseColumn(value); <br> }<br>else {<br> convertedValue = value; <br>}<br>{code}<br><br>Note that this tiny modification doesn't break the AttributeConverter specification in any way, and would allow for very powerful queries that are simply not possible in the current implementation.<br><br>I have a few other use cases that this modification would solve, and can provide them if it helps prove that this modification is very useful.<br></span> </td>
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