ExtractorLineAggregator (Spring Batch 4.1.4.RELEASE API)

java.lang.Object
- org.springframework.batch.item.file.transform.ExtractorLineAggregator<T>

所有已实现的接口:
LineAggregator<T>
直接已知子类:
DelimitedLineAggregator, FormatterLineAggregator
```
public abstract class ExtractorLineAggregator<T>
extends java.lang.Object
implements LineAggregator<T>
```
An abstract LineAggregator implementation that utilizes a FieldExtractor to convert the incoming object to an array of its parts. Extending classes must decide how those parts will be aggregated together.
从以下版本开始:
2.0
作者:
Dan Garrette

构造器概要
构造器
构造器说明
ExtractorLineAggregator()

方法概要

所有方法实例方法抽象方法具体方法
修饰符和类型	方法	说明
`java.lang.String`	`aggregate(T item)`	Extract fields from the given item using the `FieldExtractor` and then aggregate them.
`protected abstract java.lang.String`	`doAggregate(java.lang.Object[] fields)`	Aggregate provided fields into single String.
`void`	`setFieldExtractor(FieldExtractor<T> fieldExtractor)`	Public setter for the field extractor responsible for splitting an input object up into an array of objects.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - ExtractorLineAggregator
```
public ExtractorLineAggregator()
```
- 方法详细资料
  - setFieldExtractor
```
public void setFieldExtractor(FieldExtractor<T> fieldExtractor)
```
    Public setter for the field extractor responsible for splitting an input object up into an array of objects. Defaults to PassThroughFieldExtractor.
    参数:
    fieldExtractor - The field extractor to set
  - aggregate
```
public java.lang.String aggregate(T item)
```
    Extract fields from the given item using the FieldExtractor and then aggregate them. Any null field returned by the extractor will be replaced by an empty String. Null items are not allowed.
    指定者:
    aggregate 在接口中 LineAggregator<T>
    参数:
    item - values to be converted
    返回:
    string
    另请参阅:
    LineAggregator.aggregate(java.lang.Object)
  - doAggregate
```
protected abstract java.lang.String doAggregate(java.lang.Object[] fields)
```
    Aggregate provided fields into single String.
    参数:
    fields - An array of the fields that must be aggregated
    返回:
    aggregated string