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// Copyright 2015-2019 SWIM.AI inc.
//
// Licensed 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 swim.loader;

import java.util.Iterator;
import java.util.ServiceLoader;
import swim.api.router.Router;

public final class RouterLoader {
  private RouterLoader() {
    // nop
  }

  public static Router loadRouter() {
    final ServiceLoader routerLoader = ServiceLoader.load(Router.class);
    final Iterator routers = routerLoader.iterator();
    Router router;
    if (routers.hasNext()) {
      router = routers.next();
      while (routers.hasNext()) {
        // TODO: configurable router injection
        router = router.injectRouter(routers.next());
      }
    } else {
      router = null;
    }
    return router;
  }
}