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package org.glassfish.jersey.server.internal.routing;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import org.glassfish.jersey.process.Inflector;
import org.glassfish.jersey.process.internal.Inflecting;
import org.glassfish.jersey.server.ContainerResponse;
import org.glassfish.jersey.server.internal.process.RequestProcessingContext;
import org.glassfish.hk2.api.Factory;
import jersey.repackaged.com.google.common.base.Function;
/**
* Routing tree assembly utilities.
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public final class Routers {
private Routers() {
// prevents instantiation
}
/**
* Creates a leaf-node {@link Router} that implements {@link org.glassfish.jersey.process.internal.Inflecting}
* interface and returns the provided {@link org.glassfish.jersey.process.Inflector} instance
* when the {@link org.glassfish.jersey.process.internal.Inflecting#inflector()} method is called.
* {@link Router#apply} method of the created hierarchical router returns the unchanged request and an empty
* continuation iterator.
*
* @param inflector a request to response transformation to be wrapped in an
* {@code Router} instance.
* @return an {@code Router} that wraps the supplied {@code Inflector}.
*/
@SuppressWarnings("unchecked")
public static Router asTreeAcceptor(final Inflector inflector) {
return new InflectingRouter(inflector);
}
/**
* Start building a hierarchical routing tree.
*
* @param transformation root transformation function.
* @return hierarchical accepting tree builder.
*/
public static Router.Builder acceptingTree(
Function transformation) {
return new RouterBuilder(transformation);
}
public interface RootRouteBuilder extends RouteBuilder {
Router root(Router routingRoot);
}
public interface RouteBuilder {
RouteToBuilder route(String pattern);
RouteToBuilder route(T pattern);
}
public interface RouteToBuilder {
RouteToPathBuilder to(Router.Builder ab);
RouteToPathBuilder to(Router a);
RouteToPathBuilder to(Class ca);
RouteToPathBuilder to(Factory pa);
}
public interface RouteToPathBuilder extends RouteBuilder, RouteToBuilder, Router.Builder {
}
private static class InflectingRouter
implements Router, Inflecting {
private final Inflector inflector;
public InflectingRouter(final Inflector inflector) {
this.inflector = inflector;
}
@Override
public Inflector inflector() {
return inflector;
}
@Override
public Continuation apply(RequestProcessingContext context) {
return Continuation.of(context);
}
}
private static class RouterBuilder implements Router.Builder {
private final Function transformation;
private List children;
public RouterBuilder(Function transformation) {
this.transformation = transformation;
}
@Override
public Router.Builder child(Router child) {
if (children == null) {
children = new LinkedList<>();
}
children.add(child);
return this;
}
@Override
public Router build() {
return (children == null)
? new LinkedRouter(transformation) : new LinkedRouter(transformation, children);
}
}
private static class LinkedRouter implements Router {
private final Function transformation;
private final List children;
public LinkedRouter(
Function transformation, List children) {
this.transformation = transformation;
this.children = children;
}
public LinkedRouter(Function transformation) {
this.transformation = transformation;
this.children = Collections.emptyList();
}
@Override
public Continuation apply(RequestProcessingContext data) {
return Continuation.of(transformation.apply(data), children);
}
}
}