/**
 * 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.waveprotocol.box.server.authentication;

import com.google.common.base.Preconditions;

import org.waveprotocol.box.server.persistence.AccountStore;

/**
 * This class holds a reference to a global AccountStore object. It is used in
 * classes which are not instantiated by Guice, and for which the only way to
 * access the account store is via static singletons. This is the case for JAAS
 * configured login modules, like AccountStoreLoginModule.
 *
 * @author josephg@gmail.com (Joseph Gentle)
 */
public class AccountStoreHolder {
  private static AccountStore store = null;
  private static String defaultDomain = null;

  synchronized public static void init(AccountStore store, String defaultDomain) {
    Preconditions.checkNotNull(store, "Account store cannot be null");
    Preconditions.checkNotNull(defaultDomain, "Default domain cannot be null");
    Preconditions.checkState(AccountStoreHolder.store == null, "Account store already set");
    AccountStoreHolder.store = store;
    AccountStoreHolder.defaultDomain = defaultDomain.toLowerCase();
  }

  /**
   * @return the non-null account store.
   */
  public static AccountStore getAccountStore() {
    Preconditions.checkNotNull(store, "Account store not set");
    return store;
  }

  /**
   * @return the non-null default domain
   */
  public static String getDefaultDomain() {
    Preconditions.checkNotNull(defaultDomain, "Default domain not set");
    return defaultDomain;
  }

  /** Needed for testing. */
  public static void resetForTesting() {
    store = null;
    defaultDomain = null;
  }
}