memoization-guava/src/main/java/de/xn__ho_hia/memoization/guava/GuavaCacheBasedBiFunctionMemoizer.java

   1 /*
   2  * This file is part of memoization.java. It is subject to the license terms in the LICENSE file found in the top-level
   3  * directory of this distribution and at http://creativecommons.org/publicdomain/zero/1.0/. No part of memoization.java,
   4  * including this file, may be copied, modified, propagated, or distributed except according to the terms contained
   5  * in the LICENSE file.
   6  */
   7 package de.xn__ho_hia.memoization.guava;
   8
   9 import java.util.function.BiFunction;
  10
  11 import com.google.common.cache.Cache;
  12
  13 final class GuavaCacheBasedBiFunctionMemoizer<FIRST, SECOND, KEY, OUTPUT>
  14         extends AbstractGuavaCacheBasedMemoizer<KEY, OUTPUT>
  15         implements BiFunction<FIRST, SECOND, OUTPUT> {
  16
  17     private final BiFunction<FIRST, SECOND, KEY>   keyFunction;
  18     private final BiFunction<FIRST, SECOND, OUTPUT> biFunction;
  19
  20     GuavaCacheBasedBiFunctionMemoizer(
  21             final Cache<KEY, OUTPUT> cache,
  22             final BiFunction<FIRST, SECOND, KEY> keyFunction,
  23             final BiFunction<FIRST, SECOND, OUTPUT> biFunction) {
  24         super(cache);
  25         this.keyFunction = keyFunction;
  26         this.biFunction = biFunction;
  27     }
  28
  29     @Override
  30     public OUTPUT apply(final FIRST first, final SECOND second) {
  31         final KEY key = keyFunction.apply(first, second);
  32         return get(key, givenKey -> biFunction.apply(first, second));
  33     }
  34
  35 }