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.utils;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.function.BiConsumer;
  import java.util.function.Consumer;
  
  import org.apache.cassandra.distributed.api.IIsolatedExecutor.TriConsumer;
  import org.apache.cassandra.utils.Throwables;
  
  public class CompactLists
  {
      public static <I> List<I> append(List<I> in, I append)
      {
          if (in == null) return Collections.singletonList(append);
          else  if (in.size() == 1)
          {
              List<I> out = new ArrayList<>(2);
              out.add(in.get(0));
              out.add(append);
              return out;
          }
          else
          {
              in.add(append);
              return in;
          }
      }
  
      public static <I> List<I> remove(List<I> in, I remove)
      {
          if (in == null) return null;
          else if (in.size() == 1) return in.contains(remove) ? null : in;
          else
          {
              in.remove(remove);
              return in;
          }
      }
  
      public static <I> Throwable safeForEach(List<I> list, Consumer<I> forEach)
      {
          if (list == null)
              return null;
  
          if (list.size() == 1)
          {
              try
              {
                  forEach.accept(list.get(0));
                  return null;
              }
              catch (Throwable t)
              {
                  return t;
              }
          }
  
          Throwable result = null;
          for (int i = 0, maxi = list.size() ; i < maxi ; ++i)
          {
              try
              {
                  forEach.accept(list.get(i));
              }
              catch (Throwable t)
              {
                  result = Throwables.merge(result, t);
              }
          }
          return result;
      }
  
      public static <I1, I2> Throwable safeForEach(List<I1> list, BiConsumer<I1, I2> forEach, I2 i2)
      {
          if (list == null)
              return null;
  
          if (list.size() == 1)
          {
              try
              {
                  forEach.accept(list.get(0), i2);
                  return null;
              }
              catch (Throwable t)
              {
                  return t;
              }
          }
  
          Throwable result = null;
          for (int i = 0, maxi = list.size() ; i < maxi ; ++i)
          {
              try
              {
                  forEach.accept(list.get(i), i2);
              }
              catch (Throwable t)
              {
                  result = Throwables.merge(result, t);
              }
          }
          return result;
      }
  
      public static <I1, I2, I3> Throwable safeForEach(List<I1> list, TriConsumer<I1, I2, I3> forEach, I2 i2, I3 i3)
      {
          if (list == null)
              return null;
  
          if (list.size() == 1)
          {
              try
              {
                  forEach.accept(list.get(0), i2, i3);
                  return null;
              }
              catch (Throwable t)
              {
                  return t;
              }
          }
  
          Throwable result = null;
          for (int i = 0, maxi = list.size() ; i < maxi ; ++i)
          {
              try
              {
                  forEach.accept(list.get(i), i2, i3);
              }
              catch (Throwable t)
              {
                  result = Throwables.merge(result, t);
              }
          }
          return result;
      }
  
  
  }
  