content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * 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 com.android.server.wifi.hotspot2.anqp;
  
  import com.android.internal.annotations.VisibleForTesting;
  import com.android.server.wifi.ByteBufferReader;
  
  import java.net.ProtocolException;
  import java.nio.BufferUnderflowException;
  import java.nio.ByteBuffer;
  import java.nio.ByteOrder;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  
  /**
   * The NAI (Network Access Identifier) Realm ANQP Element, IEEE802.11-2012 section 8.4.4.10.
   *
   * Format:
   * | NAI Realm Count (optional) | NAI Realm Data #1 (optional) | ....
   *             2                         variable
   */
  public class NAIRealmElement extends ANQPElement {
      private final List<NAIRealmData> mRealmDataList;
  
      @VisibleForTesting
      public NAIRealmElement(List<NAIRealmData> realmDataList) {
          super(Constants.ANQPElementType.ANQPNAIRealm);
          mRealmDataList = realmDataList;
      }
  
      /**
       * Parse a NAIRealmElement from the given buffer.
       *
       * @param payload The byte buffer to read from
       * @return {@link NAIRealmElement}
       * @throws BufferUnderflowException
       */
      public static NAIRealmElement parse(ByteBuffer payload)
              throws ProtocolException {
          List<NAIRealmData> realmDataList = new ArrayList<>();
          if (payload.hasRemaining()) {
              int count = (int) ByteBufferReader.readInteger(payload, ByteOrder.LITTLE_ENDIAN, 2)
                      & 0xFFFF;
              while (count > 0) {
                  realmDataList.add(NAIRealmData.parse(payload));
                  count--;
              }
          }
          return new NAIRealmElement(realmDataList);
      }
  
      public List<NAIRealmData> getRealmDataList() {
          return Collections.unmodifiableList(mRealmDataList);
      }
  
      @Override
      public boolean equals(Object thatObject) {
          if (this == thatObject) {
              return true;
          }
          if (!(thatObject instanceof NAIRealmElement)) {
              return false;
          }
          NAIRealmElement that = (NAIRealmElement) thatObject;
          return mRealmDataList.equals(that.mRealmDataList);
      }
  
      @Override
      public int hashCode() {
          return mRealmDataList.hashCode();
      }
  
      @Override
      public String toString() {
          return "NAIRealmElement{mRealmDataList=" + mRealmDataList + "}";
      }
  }
  