org.aoju.bus.core.collection

Class PartitionIterator<T>

java.lang.Object

org.aoju.bus.core.collection.PartitionIterator<T>

Type Parameters:

T - 字段类型

All Implemented Interfaces:

Serializable, Iterable<List<T>>, Iterator<List<T>>, IterableIterator<List<T>>

public class PartitionIterator<T>
extends Object
implements IterableIterator<List<T>>, Serializable

分批迭代工具，可以分批处理数据

1. 比如调用其他客户的接口，传入的入参有限，需要分批
2. 比如mysql/oracle用in语句查询，超过1000可以分批
3. 比如数据库取出游标，可以把游标里的数据一批一批处理

Since:

JDK 1.8+

Version:

6.3.0

Author:

Kimi Liu

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Iterator<T>	iterator 被分批的迭代器
protected int	partitionSize 实际每批大小

Constructor Summary

Constructors

Constructor and Description
PartitionIterator(Iterator<T> iterator, int partitionSize) 创建分组对象

Method Summary

Modifier and Type	Method and Description
boolean	hasNext()
List<T>	next()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.aoju.bus.core.collection.IterableIterator

iterator

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Field Detail

iterator

protected final Iterator<T> iterator

被分批的迭代器

partitionSize

protected final int partitionSize

实际每批大小

Constructor Detail

PartitionIterator

public PartitionIterator(Iterator<T> iterator,
                         int partitionSize)

创建分组对象

Parameters:

iterator - 迭代器

partitionSize - 每批大小，最后一批不满一批算一批

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<List<T>>

next

public List<T> next()

Specified by:

next in interface Iterator<List<T>>