org.dromara.hutool.core.collection.iter

Class PartitionIter<T>

java.lang.Object

org.dromara.hutool.core.collection.iter.PartitionIter<T>

Type Parameters:

T - 字段类型

All Implemented Interfaces:

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

public class PartitionIter<T>
extends Object
implements IterableIter<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:

5.7.10

Author:

qiqi.chen

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
PartitionIter(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.dromara.hutool.core.collection.iter.IterableIter

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

PartitionIter

public PartitionIter(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 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>>