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.cassandra.sidecar.cluster.locator;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Set;
  import java.util.function.BiConsumer;
  
  import org.jetbrains.annotations.NotNull;
  
  /**
   * A better descriptive alias for the dc to instance set mapping
   */
  public class InstanceSetByDc
  {
      @NotNull
      public Map<String, Set<String>> mapping;
  
      public InstanceSetByDc(String dcName, Set<String> localDcInstances)
      {
          this.mapping = new HashMap<>(1);
          mapping.put(dcName, localDcInstances);
      }
  
      public InstanceSetByDc(@NotNull Map<String, Set<String>> mapping)
      {
          this.mapping = mapping;
      }
  
      public int size()
      {
          return mapping.size();
      }
  
      public Set<String> keySet()
      {
          return mapping.keySet();
      }
  
      /**
       * @return the set of instances in the given datacenter; returns an empty set of data
       */
      public Set<String> get(String dcName)
      {
          return mapping.getOrDefault(dcName, Collections.emptySet());
      }
  
      public boolean containsDatacenter(String dcName)
      {
          return mapping.containsKey(dcName);
      }
  
      public void forEach(BiConsumer<String, Set<String>> consumer)
      {
          mapping.forEach(consumer);
      }
  }
  