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.nio.BufferUnderflowException;
  import java.nio.ByteBuffer;
  import java.nio.charset.StandardCharsets;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * The Domain Name ANQP Element, IEEE802.11-2012 section 8.4.4.15.
   *
   * Format:
   * | Domain Name Field #1 (optional) | ...
   *            variable
   *
   * Domain Name Field Format:
   * | Length | Domain Name |
   *      1       variable
   */
  public class DomainNameElement extends ANQPElement {
      private final List<String> mDomains;
  
      @VisibleForTesting
      public DomainNameElement(List<String> domains) {
          super(Constants.ANQPElementType.ANQPDomName);
          mDomains = domains;
      }
  
      /**
       * Parse a DomainNameElement from the given buffer.
       *
       * @param payload The byte buffer to read from
       * @return {@link DomainNameElement}
       * @throws BufferUnderflowException
       */
      public static DomainNameElement parse(ByteBuffer payload) {
          List<String> domains = new ArrayList<>();
          while (payload.hasRemaining()) {
              // Use latin-1 to decode for now - safe for ASCII and retains encoding
              domains.add(ByteBufferReader.readStringWithByteLength(
                      payload, StandardCharsets.ISO_8859_1));
          }
          return new DomainNameElement(domains);
      }
  
      public List<String> getDomains() {
          return Collections.unmodifiableList(mDomains);
      }
  
      @Override
      public boolean equals(Object thatObject) {
          if (this == thatObject) {
              return true;
          }
          if (!(thatObject instanceof DomainNameElement)) {
              return false;
          }
          DomainNameElement that = (DomainNameElement) thatObject;
          return mDomains.equals(that.mDomains);
      }
  
      @Override
      public int hashCode() {
          return mDomains.hashCode();
      }
  
      @Override
      public String toString() {
          return "DomainName{" +
                  "mDomains=" + mDomains +
                  '}';
      }
  }
  