/*
    * Copyright 2020 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.netty.handler.codec.http3;
  
  import io.netty.util.collection.LongObjectHashMap;
  import io.netty.util.collection.LongObjectMap;
  import io.netty.util.internal.StringUtil;
  
  import java.util.Iterator;
  import java.util.Map;
  
  public final class DefaultHttp3SettingsFrame implements Http3SettingsFrame {
  
      private final LongObjectMap<Long> settings = new LongObjectHashMap<>(4);
  
      @Override
      public Long get(long key) {
          return settings.get(key);
      }
  
      @Override
      public Long put(long key, Long value) {
          if (Http3CodecUtils.isReservedHttp2Setting(key)) {
              throw new IllegalArgumentException("Setting is reserved for HTTP/2: " + key);
          }
          return settings.put(key, value);
      }
  
      @Override
      public Iterator<Map.Entry<Long, Long>> iterator() {
          return settings.entrySet().iterator();
      }
  
      @Override
      public int hashCode() {
          return settings.hashCode();
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
          DefaultHttp3SettingsFrame that = (DefaultHttp3SettingsFrame) o;
          return that.settings.equals(settings);
      }
  
      @Override
      public String toString() {
          return StringUtil.simpleClassName(this) + "(settings=" + settings + ')';
      }
  
      /**
       * Creates a new {@link DefaultHttp3SettingsFrame} which is a copy of the given settings.
       *
       * @param settingsFrame the frame to copy.
       * @return              the newly created copy.
       */
      public static DefaultHttp3SettingsFrame copyOf(Http3SettingsFrame settingsFrame) {
          DefaultHttp3SettingsFrame copy = new DefaultHttp3SettingsFrame();
          if (settingsFrame instanceof DefaultHttp3SettingsFrame) {
              copy.settings.putAll(((DefaultHttp3SettingsFrame) settingsFrame).settings);
          } else {
              for (Map.Entry<Long, Long> entry: settingsFrame) {
                  copy.put(entry.getKey(), entry.getValue());
              }
          }
          return copy;
      }
  }