1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.functor; 18 19 /** 20 * A functor that takes two arguments and returns a value. 21 * <p> 22 * Implementors are encouraged but not required to make their functors 23 * {@link java.io.Serializable Serializable}. 24 * </p> 25 * @param <L> the left argument type. 26 * @param <R> the right argument type. 27 * @param <T> the returned value type. 28 * @since 1.0 29 * @version $Revision: 1438784 $ $Date: 2013-01-26 01:09:13 +0100 (Sa, 26 Jan 2013) $ 30 */ 31 public interface BinaryFunction<L, R, T> extends BinaryFunctor<L, R> { 32 /** 33 * Evaluate this function. 34 * 35 * @param left the L element of the ordered pair of arguments 36 * @param right the R element of the ordered pair of arguments 37 * @return the T result of this function for the given arguments 38 */ 39 T evaluate(L left, R right); 40 }