org.jooby.internal.RouteChain.java Source code

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Here is the source code for org.jooby.internal.RouteChain.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.jooby.internal;

import java.util.List;
import java.util.Map;

import org.jooby.Request;
import org.jooby.Response;
import org.jooby.Route;

import com.google.common.collect.ImmutableMap;

public class RouteChain implements Route.Chain {

    private List<Route> routes;

    private String prefix;

    private int i = 0;

    private RequestImpl rreq;

    private ResponseImpl rrsp;

    private boolean hasAttrs;

    public RouteChain(final RequestImpl req, final ResponseImpl rsp, final List<Route> routes) {
        this.routes = routes;
        this.rreq = req;
        this.rrsp = rsp;

        // eager decision if we need to wrap a route to get all the attrs within the change.
        ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
        routes.forEach(r -> builder.putAll(r.attributes()));
        this.hasAttrs = builder.build().size() > 0;
    }

    @Override
    public void next(final String prefix, final Request req, final Response rsp) throws Throwable {
        if (rsp.committed()) {
            return;
        }

        if (prefix != null) {
            this.prefix = prefix;
        }

        Route route = next(this.prefix);
        // set route
        rreq.route(hasAttrs ? attrs(route, routes, i - 1) : route);
        rrsp.route(route);

        get(route).handle(req, rsp, this);
    }

    private Route next(final String prefix) {
        Route route = routes.get(i++);
        if (prefix == null) {
            return route;
        }
        while (!route.apply(prefix)) {
            route = routes.get(i++);
        }
        return route;
    }

    private RouteImpl get(final Route next) {
        return (RouteImpl) Route.Forwarding.unwrap(next);
    }

    private static Route attrs(final Route route, final List<Route> routes, final int i) {
        ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
        for (int t = i; t < routes.size(); t++) {
            builder.putAll(routes.get(t).attributes());
        }
        Map<String, Object> attrs = builder.build();
        return new Route.Forwarding(route) {
            @Override
            public Map<String, Object> attributes() {
                return attrs;
            }
        };
    }

}