001package conexp.fx.core.math;
002
003/*
004 * #%L
005 * Concept Explorer FX
006 * %%
007 * Copyright (C) 2010 - 2023 Francesco Kriegel
008 * %%
009 * This program is free software: you can redistribute it and/or modify
010 * it under the terms of the GNU General Public License as
011 * published by the Free Software Foundation, either version 3 of the
012 * License, or (at your option) any later version.
013 * 
014 * This program is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017 * GNU General Public License for more details.
018 * 
019 * You should have received a copy of the GNU General Public
020 * License along with this program.  If not, see
021 * <http://www.gnu.org/licenses/gpl-3.0.html>.
022 * #L%
023 */
024
025import java.util.Map;
026import java.util.concurrent.ConcurrentHashMap;
027import java.util.function.Function;
028
029public final class CachedFunction<T, R> implements Function<T, R> {
030
031  private final Map<T, R>      cache = new ConcurrentHashMap<>();
032  private final Function<T, R> function;
033
034  public CachedFunction(final Function<T, R> function) {
035    super();
036    this.function = function;
037  }
038
039  @Override
040  public final R apply(final T t) {
041    return cache.computeIfAbsent(t, function::apply);
042  }
043
044}