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There is a newer version: 2.0.0-rc-1

/*
 * Copyright 2014 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 ratpack.api.Nullable;
import ratpack.registry.NotInRegistryException;
import ratpack.registry.Registry;

import java.util.List;

public class SingleEntryRegistry implements Registry {

  private final RegistryEntry entry;

  public SingleEntryRegistry(RegistryEntry entry) {
    this.entry = entry;
  }

  @Override
  public  O get(Class type) throws NotInRegistryException {
    O value = maybeGet(type);
    if (value == null) {
      throw new NotInRegistryException(type);
    } else {
      return value;
    }
  }

  @Nullable
  @Override
  public  O maybeGet(Class type) {
    if (type.isAssignableFrom(entry.getType())) {
      return type.cast(entry.get());
    } else {
      return null;
    }
  }

  @Override
  public  List getAll(Class type) {
    O value = maybeGet(type);
    if (value == null) {
      return ImmutableList.of();
    } else {
      return ImmutableList.of(value);
    }
  }

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

    SingleEntryRegistry that = (SingleEntryRegistry) o;

    return entry.equals(that.entry);
  }

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