MappingFinder.java
- /*
- * *************************************************************************************************************************************************************
- *
- * TheseFoolishThings: Miscellaneous utilities
- * http://tidalwave.it/projects/thesefoolishthings
- *
- * Copyright (C) 2009 - 2025 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.impl.finder;
- // import javax.annotation.concurrent.Immutable;
- import jakarta.annotation.Nonnull;
- import java.util.List;
- import java.util.function.Function;
- import it.tidalwave.util.Finder;
- import it.tidalwave.util.spi.SimpleFinderSupport;
- import static java.util.stream.Collectors.*;
- /***************************************************************************************************************************************************************
- *
- * A {@link it.tidalwave.util.Finder} which retrieves results from another instance applying a mapper {@link Function}. Don't use directly; use
- * {@link it.tidalwave.util.Finder#mapping(Finder, Function)} instead.
- *
- * @param <T> the mapped type
- * @param <U> the type of the delegate Finder
- * @author Fabrizio Giudici
- *
- **************************************************************************************************************************************************************/
- /* @Immutable */
- public final class MappingFinder<T, U> extends SimpleFinderSupport<T>
- {
- private static final long serialVersionUID = -6359683808082070089L;
- @Nonnull
- private final Finder<? extends U> delegate;
- @Nonnull
- private final Function<? super U, ? extends T> mapper;
- /***********************************************************************************************************************************************************
- * Creates a new instance given a delegate and a mapper function.
- * @param delegate the delegate
- * @param mapper the mapper function
- **********************************************************************************************************************************************************/
- public MappingFinder (@Nonnull final Finder<? extends U> delegate, @Nonnull final Function<? super U, ? extends T> mapper)
- {
- this.delegate = delegate;
- this.mapper = mapper;
- }
- /***********************************************************************************************************************************************************
- * The special Finder copy constructor.
- * @param other the finder to copy
- * @param override the overriding object
- **********************************************************************************************************************************************************/
- @SuppressWarnings("unchecked")
- public MappingFinder (@Nonnull final MappingFinder<T, ?> other, @Nonnull final Object override)
- {
- super(other, override);
- final var source = getSource(MappingFinder.class, other, override);
- this.delegate = source.delegate;
- this.mapper = source.mapper;
- }
- /***********************************************************************************************************************************************************
- * {@inheritDoc}
- **********************************************************************************************************************************************************/
- @Override @Nonnull
- protected List<T> computeResults()
- {
- return delegate.results().stream().map(mapper).collect(toList());
- }
- }