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Expose resource lookup function

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This commit exposes the resource lookup function used by
`RouterFunctions.resources(String, Resource)`, so that it can be
composed upon.

Issue: SPR-16788
This commit is contained in:
Arjen Poutsma
2018-05-04 13:36:24 +02:00
parent cdf483fd50
commit bfb2effddb
2 changed files with 58 additions and 3 deletions
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25
spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RouterFunctions.java
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@@ -123,14 +123,35 @@ public abstract class RouterFunctions {
* For instance
* <pre class="code">
* Resource location = new FileSystemResource("public-resources/");
* RoutingFunction&lt;ServerResponse&gt; resources = RouterFunctions.resources("/resources/**", location);
* RouterFunction&lt;ServerResponse&gt; resources = RouterFunctions.resources("/resources/**", location);
* </pre>
* @param pattern the pattern to match
* @param location the location directory relative to which resources should be resolved
* @return a router function that routes to resources
* @see #resourceLookupFunction(String, Resource)
*/
public static RouterFunction<ServerResponse> resources(String pattern, Resource location) {
return resources(new PathResourceLookupFunction(pattern, location));
return resources(resourceLookupFunction(pattern, location));
}
/**
* Returns the resource lookup function used by {@link #resources(String, Resource)}.
* The returned function can be {@linkplain Function#andThen(Function) composed} on, for
* instance to return a default resource when the lookup function does not match:
* <pre class="code">
* Mono&lt;Resource&gt; defaultResource = Mono.just(new ClassPathResource("index.html"));
* Function&lt;ServerRequest, Mono&lt;Resource&gt;&gt; lookupFunction =
* RouterFunctions.resourceLookupFunction("/resources/**", new FileSystemResource("public-resources/"))
* .andThen(resourceMono -&gt; resourceMono.switchIfEmpty(defaultResource));
*
* RouterFunction&lt;ServerResponse&gt; resources = RouterFunctions.resources(lookupFunction);
* </pre>
* @param pattern the pattern to match
* @param location the location directory relative to which resources should be resolved
* @return the default resource lookup function for the given parameters.
*/
public static Function<ServerRequest, Mono<Resource>> resourceLookupFunction(String pattern, Resource location) {
return new PathResourceLookupFunction(pattern, location);
}
/**