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There is a newer version: 2.0.0-rc-1
/*
 * Copyright 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.registry.internal;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.reflect.TypeToken;
import ratpack.func.Function;
import ratpack.registry.Registry;
import ratpack.util.Types;

import java.util.Collections;
import java.util.Optional;
import java.util.concurrent.ConcurrentMap;

public class MultiEntryRegistry implements Registry {

  private final Iterable> entries;

  public MultiEntryRegistry(Iterable> entries) {
    this.entries = entries;
  }

  @Override
  public String toString() {
    return "Registry{" + entries + '}';
  }

  public  Optional maybeGet(TypeToken type) {
    ConcurrentMap, Boolean> cache = TypeCaching.cache(type);
    for (RegistryEntry entry : entries) {
      if (TypeCaching.isAssignableFrom(cache, type, entry.getType())) {
        @SuppressWarnings("unchecked") O cast = (O) entry.get();
        return Optional.ofNullable(cast);
      }
    }

    return Optional.empty();
  }

  public  Iterable getAll(final TypeToken type) {
    ImmutableList.Builder> builder = null;
    ConcurrentMap, Boolean> cache = TypeCaching.cache(type);
    for (RegistryEntry entry : entries) {
      if (TypeCaching.isAssignableFrom(cache, type, entry.getType())) {
        if (builder == null) {
          builder = ImmutableList.builder();
        }
        @SuppressWarnings("unchecked") RegistryEntry cast = (RegistryEntry) entry;
        builder.add(cast);
      }
    }

    if (builder == null) {
      return Collections.emptyList();
    } else {
      return Iterables.transform(builder.build(), RegistryEntry::get);
    }
  }

  @Override
  public  Optional first(TypeToken type, Function function) throws Exception {
    ConcurrentMap, Boolean> cache = TypeCaching.cache(type);
    for (RegistryEntry entry : entries) {
      if (TypeCaching.isAssignableFrom(cache, type, entry.getType())) {
        RegistryEntry cast = Types.cast(entry);
        O result = function.apply(cast.get());
        if (result != null) {
          return Optional.of(result);
        }
      }
    }
    return Optional.empty();
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    MultiEntryRegistry that = (MultiEntryRegistry) o;

    return entries.equals(that.entries);
  }

  @Override
  public int hashCode() {
    return entries.hashCode();
  }

}