001/* 002 * Copyright 2013 Chris Pheby 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.jadira.quant.api; 017 018/** 019 * This interface defines a composite function. It is not a higher order function as its output is a 020 * Number. It is intended to be adaptable to /compatible with {@code java.util.function.Function} 021 * being introduced into Java 8. 022 * 023 * @param <T> The input type of the function. 024 * @param <R> The result type of the function. 025 */ 026//@FunctionalInterface for Java 8 027public interface CompositeFunction<R extends Number, T extends QuantitativeFunction<R, ?>> extends QuantitativeFunction<R, T> { 028 029 /** 030 * Apply a function to the input argument T, yielding an appropriate result R. 031 * 032 * @param value the input value 033 * @return the result of the function 034 */ 035 R apply(T value); 036}