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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.runtime.lane;

import swim.api.uplink.Uplink;
import swim.runtime.LinkBinding;
import swim.structure.Value;

public class DemandLaneModel extends LaneModel, DemandLaneUplink> {
  @Override
  protected DemandLaneUplink createUplink(LinkBinding link) {
    return new DemandLaneUplink(this, link);
  }

  @Override
  protected void didOpenLaneView(DemandLaneView view) {
    view.setLaneBinding(this);
  }

  Value nextDownCue(Uplink uplink) {
    final Object views = this.views;
    if (views instanceof DemandLaneView) {
      return ((DemandLaneView) views).nextDownCue(uplink);
    } else if (views instanceof LaneView[]) {
      final LaneView[] viewArray = (LaneView[]) views;
      for (int i = 0, n = viewArray.length; i < n; i += 1) {
        final Value value = ((DemandLaneView) viewArray[i]).nextDownCue(uplink);
        if (value != null) {
          return value;
        }
      }
    }
    return null;
  }
}