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/**
 * Copyright 2017 The jetcd 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 io.etcd.jetcd.resolver;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.ServiceLoader;

@FunctionalInterface
public interface URIResolverLoader {

  /**
   * Loads the available URIResolver.
   *
   * @return a list of {@link URIResolver} or empty if no resolvers are found.
   */
  Collection load();


  /**
   * Creates a default implementation based on {@link ServiceLoader}.
   *
   * @return the default implementation.
   */
  static URIResolverLoader defaultLoader() {
    return () -> {
      List resolvers = new ArrayList<>();

      ServiceLoader.load(URIResolver.class).forEach(resolvers::add);

      return resolvers;
    };
  }
}