OptionalRenderer.java

/*
 * Copyright 2016 the original author or authors.
 *
 * 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 ratpack.render.internal;

import com.google.common.reflect.TypeToken;
import ratpack.handling.Context;
import ratpack.render.Renderer;
import ratpack.render.RendererSupport;
import ratpack.util.Types;

import java.util.Optional;

public class OptionalRenderer extends RendererSupport<Optional<?>> {

  public static final TypeToken<Renderer<Optional<?>>> TYPE = Types.intern(new TypeToken<Renderer<Optional<?>>>() {});

  public static final Renderer<Optional<?>> INSTANCE = new OptionalRenderer();

  private OptionalRenderer() {
  }

  @Override
  public void render(Context ctx, @SuppressWarnings("OptionalUsedAsFieldOrParameterType") Optional<?> o) throws Exception {
    if (o.isPresent()) {
      ctx.render(o.get());
    } else {
      ctx.notFound();
    }
  }
}