spring-batch ClassifierCompositeItemProcessor 源码
spring-batch ClassifierCompositeItemProcessor 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/ClassifierCompositeItemProcessor.java
/*
* Copyright 2014-2019 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;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.classify.Classifier;
import org.springframework.classify.ClassifierSupport;
import org.springframework.lang.Nullable;
/**
* Calls one of a collection of ItemProcessors, based on a router pattern implemented
* through the provided {@link Classifier}.
*
* Note the user is responsible for injecting a {@link Classifier} that returns an
* ItemProcessor that conforms to the declared input and output types.
*
* @author Jimmy Praet
* @since 3.0
*/
public class ClassifierCompositeItemProcessor<I, O> implements ItemProcessor<I, O> {
private Classifier<? super I, ItemProcessor<?, ? extends O>> classifier = new ClassifierSupport<>(null);
/**
* Establishes the classifier that will determine which {@link ItemProcessor} to use.
* @param classifier the {@link Classifier} to set
*/
public void setClassifier(Classifier<? super I, ItemProcessor<?, ? extends O>> classifier) {
this.classifier = classifier;
}
/**
* Delegates to injected {@link ItemProcessor} instances according to the
* classification by the {@link Classifier}.
*/
@Nullable
@Override
public O process(I item) throws Exception {
return processItem(classifier.classify(item), item);
}
/*
* Helper method to work around wildcard capture compiler error: see
* https://docs.oracle.com/javase/tutorial/java/generics/capture.html The method
* process(capture#4-of ?) in the type ItemProcessor<capture#4-of ?,capture#5-of ?
* extends O> is not applicable for the arguments (I)
*/
@SuppressWarnings("unchecked")
private <T> O processItem(ItemProcessor<T, ? extends O> processor, I input) throws Exception {
return processor.process((T) input);
}
}
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