Package org.miaixz.bus.core.center.iterator

Class PartitionIterator<T>

java.lang.Object

org.miaixz.bus.core.center.iterator.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:

Java 17+

Author:

Kimi Liu

See Also:

• Serialized Form

Field Summary

Fields

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	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 java.lang.Iterable

forEach, spliterator

Methods inherited from interface org.miaixz.bus.core.center.iterator.IterableIterator

iterator

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Field Details

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 Details

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

Throws:

IllegalArgumentException - 当partitionSize小于等于0，或iterator为null时抛出

Method Details

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

next

public List<T> next()

Specified by:

next in interface Iterator<T>