/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.solr.util.configuration;

import com.google.common.annotations.VisibleForTesting;

public class SSLConfigurationsFactory {
  static private SSLConfigurations currentConfigurations;

  /**
   * Creates if necessary and returns singleton object of Configurations. Can be used for
   * static accessor of application-wide instance.
   * @return Configurations object
   */
  static public SSLConfigurations current() {
    if (currentConfigurations == null) {
      synchronized (SSLConfigurationsFactory.class) {
        if (currentConfigurations == null) {
          currentConfigurations = getInstance();
        }
      }
    }
    return currentConfigurations;
  }

  private static SSLConfigurations getInstance() {
    return new SSLConfigurations(System.getenv());
  }

  @VisibleForTesting
  static public synchronized void setCurrent(SSLConfigurations configurations) {
    currentConfigurations = configurations;
  }
}