content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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
   *
   *    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 org.apache.kafka.clients.consumer;
  
  import java.util.Objects;
  
  /**
   * Represents a regular expression compatible with Google RE2/J, used to subscribe to topics.
   * This just keeps the String representation of the pattern, and all validations to ensure
   * it is RE2/J compatible are delegated to the broker.
   */
  public class SubscriptionPattern {
  
      /**
       * String representation the regular expression, compatible with RE2/J.
       */
      private final String pattern;
  
      public SubscriptionPattern(String pattern) {
          this.pattern = pattern;
      }
  
      /**
       * @return Regular expression pattern compatible with RE2/J.
       */
      public String pattern() {
          return this.pattern;
      }
  
      @Override
      public String toString() {
          return pattern;
      }
  
      @Override
      public int hashCode() {
          return pattern.hashCode();
      }
  
      @Override
      public boolean equals(Object obj) {
          return obj instanceof SubscriptionPattern &&
              Objects.equals(pattern, ((SubscriptionPattern) obj).pattern);
      }
  }
  