spring-batch PropertyExtractingDelegatingItemWriter 源码
spring-batch PropertyExtractingDelegatingItemWriter 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/adapter/PropertyExtractingDelegatingItemWriter.java
/*
* Copyright 2006-2013 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.adapter;
import java.util.Arrays;
import java.util.List;
import org.springframework.batch.item.ItemWriter;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.util.Assert;
/**
* Delegates processing to a custom method - extracts property values from item object and
* uses them as arguments for the delegate method.
*
* @see ItemWriterAdapter
* @author Robert Kasanicky
*/
public class PropertyExtractingDelegatingItemWriter<T> extends AbstractMethodInvokingDelegator<T>
implements ItemWriter<T> {
private String[] fieldsUsedAsTargetMethodArguments;
/**
* Extracts values from item's fields named in fieldsUsedAsTargetMethodArguments and
* passes them as arguments to the delegate method.
*/
@Override
public void write(List<? extends T> items) throws Exception {
for (T item : items) {
// helper for extracting property values from a bean
BeanWrapper beanWrapper = new BeanWrapperImpl(item);
Object[] methodArguments = new Object[fieldsUsedAsTargetMethodArguments.length];
for (int i = 0; i < fieldsUsedAsTargetMethodArguments.length; i++) {
methodArguments[i] = beanWrapper.getPropertyValue(fieldsUsedAsTargetMethodArguments[i]);
}
invokeDelegateMethodWithArguments(methodArguments);
}
}
@Override
public void afterPropertiesSet() throws Exception {
super.afterPropertiesSet();
Assert.notEmpty(fieldsUsedAsTargetMethodArguments, "fieldsUsedAsTargetMethodArguments must not be empty");
}
/**
* @param fieldsUsedAsMethodArguments the values of the these item's fields will be
* used as arguments for the delegate method. Nested property values are supported,
* e.g. <code>address.city</code>
*/
public void setFieldsUsedAsTargetMethodArguments(String[] fieldsUsedAsMethodArguments) {
this.fieldsUsedAsTargetMethodArguments = Arrays.asList(fieldsUsedAsMethodArguments)
.toArray(new String[fieldsUsedAsMethodArguments.length]);
}
}
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