ArrayListCollectorSupport.java
- /*
- * *************************************************************************************************************************************************************
- *
- * TheseFoolishThings: Miscellaneous utilities
- * http://tidalwave.it/projects/thesefoolishthings
- *
- * Copyright (C) 2009 - 2024 by Tidalwave s.a.s. (http://tidalwave.it)
- *
- * *************************************************************************************************************************************************************
- *
- * Licensed 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.
- *
- * *************************************************************************************************************************************************************
- *
- * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
- * git clone https://github.com/tidalwave-it/thesefoolishthings-src
- *
- * *************************************************************************************************************************************************************
- */
- package it.tidalwave.util.spi;
- import javax.annotation.Nonnull;
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.List;
- import java.util.Set;
- import java.util.function.BiConsumer;
- import java.util.function.BinaryOperator;
- import java.util.function.Supplier;
- import java.util.stream.Collector;
- /***************************************************************************************************************************************************************
- *
- * A support {@link Collector} which uses an {@link ArrayList} as the accumulator.
- *
- * @param <COLLECTED_TYPE> the type of collected items
- * @param <COLLECTING_TYPE> the type of collecting item
- *
- * @author Fabrizio Giudici
- *
- **************************************************************************************************************************************************************/
- public abstract class ArrayListCollectorSupport<COLLECTED_TYPE, COLLECTING_TYPE>
- implements Collector<COLLECTED_TYPE, List<COLLECTED_TYPE>, COLLECTING_TYPE>
- {
- @Override @Nonnull
- public Supplier<List<COLLECTED_TYPE>> supplier()
- {
- return ArrayList::new;
- }
- @Override @Nonnull
- public BiConsumer<List<COLLECTED_TYPE>, COLLECTED_TYPE> accumulator()
- {
- return List::add;
- }
- @Override @Nonnull
- public BinaryOperator<List<COLLECTED_TYPE>> combiner()
- {
- return (left, right) -> { left.addAll(right); return left; };
- }
- @Override @Nonnull
- public Set<Characteristics> characteristics()
- {
- // Not CONCURRENT since ArrayList is not thread-safe
- return Collections.emptySet();
- }
- }