content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.csp.sentinel.datasource.redis.config;
  
  import com.alibaba.csp.sentinel.util.AssertUtil;
  
  /**
   * An immutable representation of a host and port.
   *
   * @author tiger
   */
  public class RedisHostAndPort {
  
      private static final int NO_PORT = -1;
  
      public final String host;
      public final int port;
  
      /**
       * @param host must not be empty or {@literal null}.
       * @param port
       */
      private RedisHostAndPort(String host, int port) {
          AssertUtil.notNull(host, "host must not be null");
  
          this.host = host;
          this.port = port;
      }
  
      /**
       * Create a {@link RedisHostAndPort} of {@code host} and {@code port}
       *
       * @param host the hostname
       * @param port a valid port
       * @return the {@link RedisHostAndPort} of {@code host} and {@code port}
       */
      public static RedisHostAndPort of(String host, int port) {
          AssertUtil.isTrue(isValidPort(port), String.format("Port out of range: %s", port));
          return new RedisHostAndPort(host, port);
      }
  
      /**
       * @return {@literal true} if has a port.
       */
      public boolean hasPort() {
          return port != NO_PORT;
      }
  
      /**
       * @return the host text.
       */
      public String getHost() {
          return host;
      }
  
      /**
       * @return the port.
       */
      public int getPort() {
          if (!hasPort()) {
              throw new IllegalStateException("No port present.");
          }
          return port;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (!(o instanceof RedisHostAndPort)) {
              return false;
          }
          RedisHostAndPort that = (RedisHostAndPort)o;
          return port == that.port && (host != null ? host.equals(that.host) : that.host == null);
      }
  
      @Override
      public int hashCode() {
          int result = host != null ? host.hashCode() : 0;
          result = 31 * result + port;
          return result;
      }
  
      /**
       * @param port the port number
       * @return {@literal true} for valid port numbers.
       */
      private static boolean isValidPort(int port) {
          return port >= 0 && port <= 65535;
      }
  
      @Override
      public String toString() {
  
          StringBuilder sb = new StringBuilder();
          sb.append(host);
          if (hasPort()) {
              sb.append(':').append(port);
          }
          return sb.toString();
      }
  }
  