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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-10892" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-d9007b19-c41c-49d1-bfa7-bde94d8fa76e" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10892" style="color: #3b73af; text-decoration: none">HHH-10892</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-10892" style="color: #3b73af; text-decoration: none">Add convert fallback for AttributeConverter while binding value</a> </span> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-d9007b19-c41c-49d1-bfa7-bde94d8fa76e" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 4.3.11, 5.1.0, 5.2.0 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </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">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 24/Jun/2016 21:38 PM </td>
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<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="quaff" id="email_quaff" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=quaff" style="color:#6c797f;; color: #3b73af; text-decoration: none">zhouyanming</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"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">I have an AttributeConverter which convert Set<String> to comma separated string.</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Converter
<span class="code-keyword" style="color: #000091">public</span> class StringSetConverter <span class="code-keyword" style="color: #000091">implements</span> AttributeConverter<Set<<span class="code-object" style="color: #910091">String</span>>, <span class="code-object" style="color: #910091">String</span>> {
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> <span class="code-keyword" style="color: #000091">final</span> <span class="code-object" style="color: #910091">String</span> SEPARATOR = <span class="code-quote" style="color: #009100">","</span>;
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> convertToDatabaseColumn(Set<<span class="code-object" style="color: #910091">String</span>> set) {
<span class="code-keyword" style="color: #000091">if</span> (set == <span class="code-keyword" style="color: #000091">null</span>)
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">null</span>;
<span class="code-keyword" style="color: #000091">if</span> (set.isEmpty())
<span class="code-keyword" style="color: #000091">return</span> "";
<span class="code-keyword" style="color: #000091">return</span> StringUtils.join(set.iterator(), SEPARATOR);
}
@Override
<span class="code-keyword" style="color: #000091">public</span> Set<<span class="code-object" style="color: #910091">String</span>> convertToEntityAttribute(<span class="code-object" style="color: #910091">String</span> string) {
<span class="code-keyword" style="color: #000091">if</span> (string == <span class="code-keyword" style="color: #000091">null</span>)
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">null</span>;
Set<<span class="code-object" style="color: #910091">String</span>> set = <span class="code-keyword" style="color: #000091">new</span> LinkedHashSet<>();
<span class="code-keyword" style="color: #000091">if</span> (StringUtils.isNotBlank(string))
set.addAll(Arrays.asList(string.split(SEPARATOR)));
<span class="code-keyword" style="color: #000091">return</span> set;
}
}
</pre>
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<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
<span class="code-keyword" style="color: #000091">public</span> class Post <span class="code-keyword" style="color: #000091">implements</span> Serializable {
...
@Convert(converter=StringSetConverter.class)
<span class="code-keyword" style="color: #000091">private</span> Set<<span class="code-object" style="color: #910091">String</span>> tags = <span class="code-keyword" style="color: #000091">new</span> LinkedHashSet<>(0);
<span class="code-keyword" style="color: #000091">public</span> Set<<span class="code-object" style="color: #910091">String</span>> getTags() {
<span class="code-keyword" style="color: #000091">return</span> tags;
}
<span class="code-keyword" style="color: #000091">public</span> void setTags(Set<<span class="code-object" style="color: #910091">String</span>> tags) {
<span class="code-keyword" style="color: #000091">this</span>.tags = tags;
}
...
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It's works with:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Restrictions.eq(<span class="code-quote" style="color: #009100">"tags"</span>, Collections.singleton(tag));
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">And I wish it works with:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Restrictions.eq(<span class="code-quote" style="color: #009100">"tags"</span>, tag); <span class="code-comment" style="color: #808080">//tag is target type already, shouldn't be converted </span>
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">But it will throw ClassCastException:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Caused by: java.lang.ClassCastException: java.lang.<span class="code-object" style="color: #910091">String</span> cannot be <span class="code-keyword" style="color: #000091">cast</span> to java.util.Set
at org.ironrhino.core.hibernate.convert.StringSetConverter.convertToDatabaseColumn(StringSetConverter.java:1) ~[classes/:?]
at org.hibernate.type.descriptor.converter.AttributeConverterSqlTypeDescriptorAdapter$1.bind(AttributeConverterSqlTypeDescriptorAdapter.java:78) ~[hibernate-core-5.1.0.
jar:5.1.0.Final]
</pre>
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