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.client.selection;
  
  import java.util.Iterator;
  import java.util.NoSuchElementException;
  
  import org.apache.cassandra.sidecar.client.SidecarInstance;
  import org.jetbrains.annotations.NotNull;
  
  /**
   * A selection policy for a single Cassandra Sidecar instance
   */
  public class SingleInstanceSelectionPolicy implements InstanceSelectionPolicy
  {
      private final SidecarInstance sidecarInstance;
  
      /**
       * Constructs a {@link SingleInstanceSelectionPolicy} with the provided {@code sidecarInstance}.
       *
       * @param sidecarInstance the sidecar instance
       */
      public SingleInstanceSelectionPolicy(SidecarInstance sidecarInstance)
      {
          this.sidecarInstance = sidecarInstance;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      @NotNull
      public Iterator<SidecarInstance> iterator()
      {
          return new Iterator<SidecarInstance>()
          {
              boolean hasNext = true;
  
              @Override
              public boolean hasNext()
              {
                  return hasNext;
              }
  
              @Override
              public SidecarInstance next()
              {
                  if (!hasNext)
                  {
                      throw new NoSuchElementException();
                  }
                  hasNext = false;
                  return sidecarInstance;
              }
          };
      }
  }
  