com.graphdbapi.parkit.accumulator

Class MapAccumulator<K,V>

java.lang.Object

com.graphdbapi.parkit.accumulator.MapAccumulator<K,V>

All Implemented Interfaces:

Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

public class MapAccumulator<K,V>
extends java.lang.Object
implements Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

Since:

3.5.0

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.Map<K,V>	result

Constructor Summary

Constructors

Constructor and Description
MapAccumulator()
MapAccumulator(java.util.Map<K,V> value)

Method Summary

Modifier and Type	Method and Description
void	add(java.util.Map.Entry<K,V> value) 添加新值到累计器
Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>	copy() 复制
java.util.Map<K,V>	getAvgSum() 获取avg的总和值 备注: 集合类型调用返回null
java.lang.Long	getNum() 用于avg的返回数量
boolean	isZero() 判断是否是初始值
void	merge(Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>> other) 合并累计器
void	reset() 重置累计器的值
java.util.Map<K,V>	value() 返回累计器的值

Methods inherited from class java.lang.Object

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

Field Detail

result

protected final java.util.Map<K,V> result

Constructor Detail

MapAccumulator

public MapAccumulator()

MapAccumulator

public MapAccumulator(java.util.Map<K,V> value)

Method Detail

isZero

public boolean isZero()

Description copied from interface: Accumulator

判断是否是初始值

Specified by:

isZero in interface Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

Returns:

是否是初始值

copy

public Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>> copy()

Description copied from interface: Accumulator

复制

Specified by:

copy in interface Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

Returns:

复制出来的对象

reset

public void reset()

Description copied from interface: Accumulator

重置累计器的值

Specified by:

reset in interface Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

add

public void add(java.util.Map.Entry<K,V> value)

Description copied from interface: Accumulator

添加新值到累计器

Specified by:

add in interface Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

Parameters:

value - 需要添加的新值

merge

public void merge(Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>> other)

Description copied from interface: Accumulator

合并累计器

Specified by:

merge in interface Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

Parameters:

other - 需要合并的累计器

value

public java.util.Map<K,V> value()

Description copied from interface: Accumulator

返回累计器的值

Specified by:

value in interface Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

Returns:

累计器的值

getNum

public java.lang.Long getNum()

Description copied from interface: Accumulator

用于avg的返回数量

Specified by:

getNum in interface Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

Returns:

返回累计数量

getAvgSum

public java.util.Map<K,V> getAvgSum()

Description copied from interface: Accumulator

获取avg的总和值 备注: 集合类型调用返回null

Specified by:

getAvgSum in interface Accumulator<java.util.Map.Entry<K,V>,java.util.Map<K,V>>

Returns:

返回avg的总和值