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| <h2 title="Annotation Type MapKeyClass" class="title">Annotation Type MapKeyClass</h2> |
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| <pre>@Target(value={METHOD,FIELD}) |
| @Retention(value=RUNTIME) |
| public @interface <span class="memberNameLabel">MapKeyClass</span></pre> |
| <div class="block">Specifies the type of the map key for associations of type |
| <code>java.util.Map</code>. The map key can be a basic type, an |
| embeddable class, or an entity. If the map is specified using Java |
| generics, the <code>MapKeyClass</code> annotation and associated |
| type need not be specified; otherwise they must be specified. |
| |
| <p> The <code>MapKeyClass</code> annotation is used in conjunction |
| with <code>ElementCollection</code> or one of the collection-valued |
| relationship annotations (<code>OneToMany</code> or <code>ManyToMany</code>). |
| The <code>MapKey</code> annotation is not used when |
| <code>MapKeyClass</code> is specified and vice versa. |
| |
| <pre> |
| |
| Example 1: |
| |
| @Entity |
| public class Item { |
| @Id int id; |
| ... |
| @ElementCollection(targetClass=String.class) |
| @MapKeyClass(String.class) |
| Map images; // map from image name to image filename |
| ... |
| } |
| |
| Example 2: |
| |
| // MapKeyClass and target type of relationship can be defaulted |
| |
| @Entity |
| public class Item { |
| @Id int id; |
| ... |
| @ElementCollection |
| Map<String, String> images; |
| ... |
| } |
| |
| Example 3: |
| |
| @Entity |
| public class Company { |
| @Id int id; |
| ... |
| @OneToMany(targetEntity=com.example.VicePresident.class) |
| @MapKeyClass(com.example.Division.class) |
| Map organization; |
| } |
| |
| Example 4: |
| |
| // MapKeyClass and target type of relationship are defaulted |
| |
| @Entity |
| public class Company { |
| @Id int id; |
| ... |
| @OneToMany |
| Map<Division, VicePresident> organization; |
| } |
| |
| </pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.0</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../jakarta/persistence/ElementCollection.html" title="annotation in jakarta.persistence"><code>ElementCollection</code></a>, |
| <a href="../../jakarta/persistence/OneToMany.html" title="annotation in jakarta.persistence"><code>OneToMany</code></a>, |
| <a href="../../jakarta/persistence/ManyToMany.html" title="annotation in jakarta.persistence"><code>ManyToMany</code></a></dd> |
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| <h3>Required Element Summary</h3> |
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| <caption><span>Required Elements</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Required Element and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>java.lang.Class</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/MapKeyClass.html#value--">value</a></span></code> |
| <div class="block">(Required) The type of the map key.</div> |
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| <h4>value</h4> |
| <pre>public abstract java.lang.Class value</pre> |
| <div class="block">(Required) The type of the map key.</div> |
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