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.causeway.commons.internal.collections;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Set;
  import java.util.function.BiConsumer;
  import java.util.function.BinaryOperator;
  import java.util.function.Function;
  import java.util.function.Supplier;
  import java.util.stream.Collector;
  
  /**
   * package private helper for utility class {@link _Collections}
   *
   * Collector for Collections.
   */
  record _Collections_Collector<T, C extends Collection<T>>(
          Supplier<C> supplier,
          Function<C, C> finisher
          ) implements Collector<T, C, C> {
  
      @Override
      public Supplier<C> supplier() {
          return supplier;
      }
  
      @Override
      public BiConsumer<C, T> accumulator() {
          return Collection::add;
      }
  
      @Override
      public BinaryOperator<C> combiner() {
          return (left, right) -> { left.addAll(right); return left; };
      }
  
      @Override
      public Function<C, C> finisher() {
          return finisher;
      }
  
      @Override
      public Set<Characteristics> characteristics() {
          return Collections.emptySet();
      }
  
  }
  