Package org.apache.hadoop.hdfs.util

Class EnumCounters<E extends java.lang.Enum<E>>

java.lang.Object

org.apache.hadoop.hdfs.util.EnumCounters<E>

Type Parameters:

E - the enum type

Direct Known Subclasses:

ConstEnumCounters, NumberReplicas, Quota.Counts

public class EnumCounters<E extends java.lang.Enum<E>>
extends java.lang.Object

Counters for an enum type. For example, suppose there is an enum type

 enum Fruit { APPLE, ORANGE, GRAPE }
 

An EnumCounters object can be created for counting the numbers of APPLE, ORANGE and GRAPE.

Constructor Summary

Constructors

Constructor	Description
EnumCounters(java.lang.Class<E> enumClass)	Construct counters for the given enum constants.
EnumCounters(java.lang.Class<E> enumClass, long defaultVal)

Method Summary

Modifier and Type	Method	Description
void	add(E e, long value)	Add the given value to counter e.
void	add(EnumCounters<E> that)	Add that counters to this counters.
boolean	allLessOrEqual(long val)
boolean	anyGreaterOrEqual(long val)
long[]	asArray()
EnumCounters<E>	deepCopyEnumCounter()	Return a deep copy of EnumCounter.
boolean	equals(java.lang.Object obj)
long	get(E e)
int	hashCode()
void	negation()	Negate all counters.
void	reset()	Reset all counters to zero.
void	reset(long val)
void	set(E e, long value)	Set counter e to the given value.
void	set(EnumCounters<E> that)	Set this counters to that counters.
void	subtract(E e, long value)	Subtract the given value from counter e.
void	subtract(EnumCounters<E> that)	Subtract this counters from that counters.
long	sum()
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

EnumCounters

public EnumCounters(java.lang.Class<E> enumClass)

Construct counters for the given enum constants.

Parameters:

enumClass - the enum class of the counters.

EnumCounters

public EnumCounters(java.lang.Class<E> enumClass,
                    long defaultVal)

Method Detail

get

public final long get(E e)

Returns:

the value of counter e.

asArray

public long[] asArray()

Returns:

the values of counter as a shadow copy of array

negation

public void negation()

Negate all counters.

set

public void set(E e,
                long value)

Set counter e to the given value.

set

public void set(EnumCounters<E> that)

Set this counters to that counters.

reset

public void reset()

Reset all counters to zero.

add

public void add(E e,
                long value)

Add the given value to counter e.

add

public void add(EnumCounters<E> that)

Add that counters to this counters.

subtract

public void subtract(E e,
                     long value)

Subtract the given value from counter e.

subtract

public void subtract(EnumCounters<E> that)

Subtract this counters from that counters.

sum

public long sum()

Returns:

the sum of all counters.

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

deepCopyEnumCounter

public EnumCounters<E> deepCopyEnumCounter()

Return a deep copy of EnumCounter.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

reset

public void reset(long val)

allLessOrEqual

public boolean allLessOrEqual(long val)

anyGreaterOrEqual

public boolean anyGreaterOrEqual(long val)