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| <H2> |
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| javax.persistence</FONT> |
| <BR> |
| Annotation Type MapKeyClass</H2> |
| <HR> |
| <DL> |
| <DT><PRE><FONT SIZE="-1">@Target(value={METHOD,FIELD}) |
| @Retention(value=RUNTIME) |
| </FONT>public @interface <B>MapKeyClass</B></DL> |
| </PRE> |
| |
| <P> |
| 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> |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>See Also:</B><DD><A HREF="../../javax/persistence/ElementCollection.html" title="annotation in javax.persistence"><CODE>ElementCollection</CODE></A>, |
| <A HREF="../../javax/persistence/OneToMany.html" title="annotation in javax.persistence"><CODE>OneToMany</CODE></A>, |
| <A HREF="../../javax/persistence/ManyToMany.html" title="annotation in javax.persistence"><CODE>ManyToMany</CODE></A><DT><B>Since:</B></DT> |
| <DD>Java Persistence 2.0</DD> |
| </DL> |
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| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> java.lang.Class</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/persistence/MapKeyClass.html#value()">value</A></B></CODE> |
| |
| <BR> |
| (Required) The type of the map key.</TD> |
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| <B>Element Detail</B></FONT></TH> |
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| |
| <A NAME="value()"><!-- --></A><H3> |
| value</H3> |
| <PRE> |
| public abstract java.lang.Class <B>value</B></PRE> |
| <DL> |
| <DD>(Required) The type of the map key. |
| <P> |
| <DD><DL> |
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