001/*
002 * Copyright 2017 the original author or authors.
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 *      https://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.springframework.batch.item.function;
017
018import java.util.function.Function;
019
020import org.springframework.batch.item.ItemProcessor;
021import org.springframework.util.Assert;
022
023/**
024 * An {@link ItemProcessor} implementation that delegates to a {@link Function}
025 *
026 * @author Michael Minella
027 * @since 4.0
028 */
029public class FunctionItemProcessor<I, O> implements ItemProcessor<I, O>{
030
031        private final Function<I, O> function;
032
033        /**
034         * @param function the delegate.  Must not be null
035         */
036        public FunctionItemProcessor(Function<I, O> function) {
037                Assert.notNull(function, "A function is required");
038                this.function = function;
039        }
040
041        @Override
042        public O process(I item) throws Exception {
043                return this.function.apply(item);
044        }
045}