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| <h2 title="Annotation Type PathParam" class="title">Annotation Type PathParam</h2> |
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| <pre>@Retention(value=RUNTIME) |
| @Target(value=PARAMETER) |
| public @interface <span class="memberNameLabel">PathParam</span></pre> |
| <div class="block">This annotation may be used to annotate method parameters on server endpoints where a URI-template has been used in |
| the path-mapping of the <a href="../../../javax/websocket/server/ServerEndpoint.html" title="annotation in javax.websocket.server"><code>ServerEndpoint</code></a> annotation. The method parameter may be of type String, any Java |
| primitive type or any boxed version thereof. If a client URI matches the URI-template, but the requested path |
| parameter cannot be decoded, then the websocket's error handler will be called. |
| |
| <p> |
| For example:- |
| |
| <pre> |
| <code> |
| @ServerEndpoint("/bookings/{guest-id}") |
| public class BookingServer { |
| |
| @OnMessage |
| public void processBookingRequest(@PathParam("guest-id") String guestID, String message, Session session) { |
| // process booking from the given guest here |
| } |
| } |
| </code> |
| </pre> |
| |
| <p> |
| For example:- |
| |
| <pre> |
| <code> |
| @ServerEndpoint("/rewards/{vip-level}") |
| public class RewardServer { |
| |
| @OnMessage |
| public void processReward(@PathParam("vip-level") Integer vipLevel, String message, Session session) { |
| // process reward here |
| } |
| } |
| </code> |
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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.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/websocket/server/PathParam.html#value--">value</a></span></code> |
| <div class="block">The name of the variable used in the URI-template.</div> |
| </td> |
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| <h4>value</h4> |
| <pre>public abstract java.lang.String value</pre> |
| <div class="block">The name of the variable used in the URI-template. If the name does not match a path variable in the |
| URI-template, the value of the method parameter this annotation annotates is <code>null</code>.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the name of the variable used in the URI-template.</dd> |
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