spring-batch CompositeItemProcessorBuilder 源码
spring-batch CompositeItemProcessorBuilder 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/builder/CompositeItemProcessorBuilder.java
/*
* Copyright 2017-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.batch.item.support.builder;
import java.util.Arrays;
import java.util.List;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.support.CompositeItemProcessor;
import org.springframework.util.Assert;
/**
* Creates a fully qualified {@link CompositeItemProcessorBuilder}.
*
* @author Glenn Renfro
* @author Drummond Dawson
* @since 4.0
*/
public class CompositeItemProcessorBuilder<I, O> {
private List<? extends ItemProcessor<?, ?>> delegates;
/**
* Establishes the {@link ItemProcessor} delegates that will work on the item to be
* processed.
* @param delegates list of {@link ItemProcessor} delegates that will work on the
* item.
* @return this instance for method chaining.
* @see CompositeItemProcessor#setDelegates(List)
*/
public CompositeItemProcessorBuilder<I, O> delegates(List<? extends ItemProcessor<?, ?>> delegates) {
this.delegates = delegates;
return this;
}
/**
* Establishes the {@link ItemProcessor} delegates that will work on the item to be
* processed.
* @param delegates the {@link ItemProcessor} delegates that will work on the item.
* @return this instance for method chaining.
* @see CompositeItemProcessorBuilder#delegates(List)
*/
public CompositeItemProcessorBuilder<I, O> delegates(ItemProcessor<?, ?>... delegates) {
return delegates(Arrays.asList(delegates));
}
/**
* Returns a fully constructed {@link CompositeItemProcessor}.
* @return a new {@link CompositeItemProcessor}
*/
public CompositeItemProcessor<I, O> build() {
Assert.notNull(delegates, "A list of delegates is required.");
Assert.notEmpty(delegates, "The delegates list must have one or more delegates.");
CompositeItemProcessor<I, O> processor = new CompositeItemProcessor<>();
processor.setDelegates(this.delegates);
return processor;
}
}
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