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 */ 016 017package org.springframework.batch.item.support.builder; 018 019import java.util.List; 020 021import org.springframework.batch.item.ItemProcessor; 022import org.springframework.batch.item.support.CompositeItemProcessor; 023import org.springframework.util.Assert; 024 025/** 026 * Creates a fully qualified {@link CompositeItemProcessorBuilder}. 027 * 028 * @author Glenn Renfro 029 * 030 * @since 4.0 031 */ 032public class CompositeItemProcessorBuilder<I, O> { 033 private List<? extends ItemProcessor<?, ?>> delegates; 034 035 /** 036 * Establishes the {@link ItemProcessor} delegates that will work on the item to be processed. 037 * @param delegates list of {@link ItemProcessor} delegates that will work on the item. 038 * @return this instance for method chaining. 039 * @see CompositeItemProcessor#setDelegates(List) 040 */ 041 public CompositeItemProcessorBuilder<I, O> delegates(List<? extends ItemProcessor<?, ?>> delegates) { 042 this.delegates = delegates; 043 044 return this; 045 } 046 047 /** 048 * Returns a fully constructed {@link CompositeItemProcessor}. 049 * 050 * @return a new {@link CompositeItemProcessor} 051 */ 052 public CompositeItemProcessor<I, O> build() { 053 Assert.notNull(delegates, "A list of delegates is required."); 054 Assert.notEmpty(delegates, "The delegates list must have one or more delegates."); 055 056 CompositeItemProcessor<I, O> processor = new CompositeItemProcessor<>(); 057 processor.setDelegates(this.delegates); 058 return processor; 059 } 060}