ChainConfigurers.java

/*
 * Copyright 2012-2013 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.spring.config.internal;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.stereotype.Component;
import ratpack.func.Action;
import ratpack.handling.Chain;
import ratpack.handling.Handler;
import ratpack.handling.Handlers;
import ratpack.server.ServerConfig;
import ratpack.spring.config.RatpackServerCustomizer;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Component
public class ChainConfigurers implements Action<Chain> {

  @Autowired(required = false)
  private List<Action<Chain>> delegates = Collections.emptyList();

  @Autowired(required = false)
  private List<Handler> handlers = Collections.emptyList();

  @Autowired(required = false)
  private List<RatpackServerCustomizer> customizers = Collections.emptyList();

  @Override
  public void execute(Chain chain) throws Exception {
    List<Action<Chain>> delegates = new ArrayList<>(this.delegates);
    for (RatpackServerCustomizer customizer : customizers) {
      delegates.addAll(customizer.getHandlers());
    }
    if (handlers.size() == 1 || delegates.isEmpty()) {
      delegates.add(singleHandlerAction());
    }
    delegates.add(staticResourcesAction(chain.getServerConfig()));
    AnnotationAwareOrderComparator.sort(delegates);
    for (Action<Chain> delegate : delegates) {
      if (!(delegate instanceof ChainConfigurers)) {
        delegate.execute(chain);
      }
    }
  }

  private Action<Chain> staticResourcesAction(final ServerConfig config) {
    return chain -> chain
      .all(Handlers.files(config, f -> f.dir("static").indexFiles("index.html")))
      .all(Handlers.files(config, f -> f.dir("public").indexFiles("index.html")));
  }

  private Action<Chain> singleHandlerAction() {
    return chain -> {
      if (handlers.size() == 1) {
        chain.get(handlers.get(0));
      }
    };
  }

}