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   /*
    * Copyright 2016 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.smtp;
  
  import io.netty.util.internal.ObjectUtil;
  import io.netty.util.internal.UnstableApi;
  
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Default {@link SmtpRequest} implementation.
   */
  @UnstableApi
  public final class DefaultSmtpRequest implements SmtpRequest {
  
      private final SmtpCommand command;
      private final List<CharSequence> parameters;
  
      /**
       * Creates a new instance with the given command and no parameters.
       */
      public DefaultSmtpRequest(SmtpCommand command) {
          this.command = ObjectUtil.checkNotNull(command, "command");
          parameters = Collections.emptyList();
      }
  
      /**
       * Creates a new instance with the given command and parameters.
       */
      public DefaultSmtpRequest(SmtpCommand command, CharSequence... parameters) {
          this.command = ObjectUtil.checkNotNull(command, "command");
          this.parameters = SmtpUtils.toUnmodifiableList(parameters);
      }
  
      /**
       * Creates a new instance with the given command and parameters.
       */
      public DefaultSmtpRequest(CharSequence command, CharSequence... parameters) {
          this(SmtpCommand.valueOf(command), parameters);
      }
  
      DefaultSmtpRequest(SmtpCommand command, List<CharSequence> parameters) {
          this.command = ObjectUtil.checkNotNull(command, "command");
          this.parameters = parameters != null ?
                  Collections.unmodifiableList(parameters) : Collections.<CharSequence>emptyList();
      }
  
      @Override
      public SmtpCommand command() {
          return command;
      }
  
      @Override
      public List<CharSequence> parameters() {
          return parameters;
      }
  
      @Override
      public int hashCode() {
          return command.hashCode() * 31 + parameters.hashCode();
      }
  
      @Override
      public boolean equals(Object o) {
          if (!(o instanceof DefaultSmtpRequest)) {
              return false;
          }
  
          if (o == this) {
              return true;
          }
  
          DefaultSmtpRequest other = (DefaultSmtpRequest) o;
  
          return command().equals(other.command()) &&
                  parameters().equals(other.parameters());
      }
  
      @Override
      public String toString() {
          return "DefaultSmtpRequest{" +
                  "command=" + command +
                  ", parameters=" + parameters +
                  '}';
      }
 }