/*
 * Copyright (c) 2014 Red Hat, Inc. and others
 *
 * Red Hat licenses this file to you 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.vertx.config.impl.spi;

import io.vertx.config.spi.ConfigStore;
import io.vertx.core.Future;
import io.vertx.core.Promise;
import io.vertx.core.Vertx;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.impl.VertxInternal;
import io.vertx.core.json.JsonObject;

/**
 * An implementation of configuration store just retrieving the passed json object.
 * This store implementation is useful to support the `conf` parameter used by the Launcher class.
 *
 * @author <a href="http://escoffier.me">Clement Escoffier</a>
 */
public class JsonConfigStore implements ConfigStore {

  private final VertxInternal vertx;
  private final JsonObject config;

  public JsonConfigStore(Vertx vertx, JsonObject configuration) {
    this.vertx = (VertxInternal) vertx;
    config = configuration;
  }

  @Override
  public Future<Buffer> get() {
    Promise<Buffer> promise = vertx.promise();
    if (config == null) {
      promise.fail("no configuration");
    } else {
      promise.complete(config.toBuffer());
    }
    return promise.future();
  }

  @Override
  public Future<Void> close() {
    return vertx.getOrCreateContext().succeededFuture();
  }
}
