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.simulator;
  
  import java.util.ArrayList;
  
  import com.google.common.base.Preconditions;
  
  import org.apache.cassandra.utils.Shared;
  
  import static org.apache.cassandra.utils.Shared.Scope.SIMULATION;
  
  /**
   * A (possibly empty) collection of OrderOn
   */
  @Shared(scope = SIMULATION)
  public interface OrderOns
  {
      /**
       * Equivalent to !isEmpty()
       */
      boolean isOrdered();
  
      /**
       * Equivalent to anyMatch(OrderOn::isOrdered)
       */
      boolean isStrict();
  
      /**
       * Return an {@code OrderOns} (possibly this one) also containing {@code add}
       */
      OrderOns with(OrderOn add);
  
      /**
       * The number of {@link OrderOn} contained in this collection
       */
      int size();
  
      /**
       * The i'th {@link OrderOn} contained in this collection
       */
      OrderOn get(int i);
  
      public static final OrderOn NONE = new OrderOn()
      {
          @Override
          public OrderOns with(OrderOn add)
          {
              return add;
          }
  
          @Override
          public int size()
          {
              return 0;
          }
  
          @Override
          public OrderOn get(int i)
          {
              throw new IndexOutOfBoundsException();
          }
  
          @Override
          public int concurrency()
          {
              return Integer.MAX_VALUE;
          }
  
          @Override
          public String toString()
          {
              return "Unordered";
          }
      };
  
      public class TwoOrderOns implements OrderOns
      {
          final OrderOn one;
          final OrderOn two;
  
          public TwoOrderOns(OrderOn one, OrderOn two)
          {
              this.one = one;
              this.two = two;
          }
  
          @Override
          public boolean isOrdered()
          {
              return true;
          }
  
          @Override
          public boolean isStrict()
          {
              return one.isStrict() || two.isStrict();
          }
  
          @Override
          public OrderOns with(OrderOn three)
          {
              OrderOnsList result = new OrderOnsList();
              result.add(one);
              result.add(two);
              result.add(three);
              return result;
          }
  
          @Override
          public int size()
          {
              return 2;
          }
  
          @Override
          public OrderOn get(int i)
          {
              Preconditions.checkArgument((i & 1) == i);
              return i == 0 ? one : two;
          }
      }
  
      public class OrderOnsList extends ArrayList<OrderOn> implements OrderOns
      {
          @Override
          public boolean isOrdered()
          {
              return true;
          }
  
          @Override
          public boolean isStrict()
          {
              for (int i = 0 ; i < size() ; ++i)
              {
                  if (get(i).isStrict())
                      return true;
              }
              return false;
          }
  
          public OrderOns with(OrderOn add)
          {
              add(add);
              return this;
          }
      }
  }
  