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 org.springframework.batch.item.ItemStreamReader; 020import org.springframework.batch.item.support.SynchronizedItemStreamReader; 021import org.springframework.util.Assert; 022 023/** 024 * Creates a fully qualified SynchronizedItemStreamReader. 025 * 026 * @author Glenn Renfro 027 * 028 * @since 4.0 029 */ 030public class SynchronizedItemStreamReaderBuilder<T> { 031 032 private ItemStreamReader<T> delegate; 033 034 /** 035 * The item stream reader to use as a delegate. Items are read from the delegate and 036 * passed to the caller in 037 * {@link org.springframework.batch.item.support.SynchronizedItemStreamReader#read()}. 038 * 039 * @param delegate the delegate to set 040 * @return this instance for method chaining 041 * @see SynchronizedItemStreamReader#setDelegate(ItemStreamReader) 042 */ 043 public SynchronizedItemStreamReaderBuilder<T> delegate(ItemStreamReader<T> delegate) { 044 this.delegate = delegate; 045 046 return this; 047 } 048 049 /** 050 * Returns a fully constructed {@link SynchronizedItemStreamReader}. 051 * 052 * @return a new {@link SynchronizedItemStreamReader} 053 */ 054 public SynchronizedItemStreamReader<T> build() { 055 Assert.notNull(this.delegate, "A delegate is required"); 056 057 SynchronizedItemStreamReader<T> reader = new SynchronizedItemStreamReader<>(); 058 reader.setDelegate(this.delegate); 059 return reader; 060 } 061}