spring-batch BeanWrapperFieldExtractor 源码
spring-batch BeanWrapperFieldExtractor 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/file/transform/BeanWrapperFieldExtractor.java
/*
* Copyright 2006-2007 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.file.transform;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
/**
* This is a field extractor for a java bean. Given an array of property names, it will
* reflectively call getters on the item and return an array of all the values.
*
* @author Dan Garrette
* @since 2.0
*/
public class BeanWrapperFieldExtractor<T> implements FieldExtractor<T>, InitializingBean {
private String[] names;
/**
* @param names field names to be extracted by the {@link #extract(Object)} method.
*/
public void setNames(String[] names) {
Assert.notNull(names, "Names must be non-null");
this.names = Arrays.asList(names).toArray(new String[names.length]);
}
/**
* @see org.springframework.batch.item.file.transform.FieldExtractor#extract(java.lang.Object)
*/
@Override
public Object[] extract(T item) {
List<Object> values = new ArrayList<>();
BeanWrapper bw = new BeanWrapperImpl(item);
for (String propertyName : this.names) {
values.add(bw.getPropertyValue(propertyName));
}
return values.toArray();
}
@Override
public void afterPropertiesSet() {
Assert.notNull(names, "The 'names' property must be set.");
}
}
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