com.aliyun.odps.io

Class TimestampWritable

java.lang.Object

com.aliyun.odps.io.AbstractDatetimeWritable<TimestampWritable>

com.aliyun.odps.io.TimestampWritable

All Implemented Interfaces:

Writable, WritableComparable<TimestampWritable>, Comparable<TimestampWritable>

public class TimestampWritable
extends AbstractDatetimeWritable<TimestampWritable>

TimestampWritable 提供了 datetime 的 Writable 和 WritableComparable 的实现

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TimestampWritable.Comparator TimestampWritable 对象的 WritableComparator 自然顺序实现（升序）.
static class	TimestampWritable.DecreasingComparator TimestampWritable 对象的 WritableComparator 降序实现.

Constructor Summary

Constructors

Constructor and Description
TimestampWritable() 默认构造 datetime 值为0的 TimestampWritable.
TimestampWritable(long time) 构造毫秒值为给定 value 的 TimestampWritable.
TimestampWritable(long seconds, int nanos) 根据给定的秒以及纳秒刻度构造 TimestampWritable

Method Summary

Modifier and Type	Method and Description
int	compareTo(TimestampWritable o) 比较两个 AbstractDatetimeWritable 的值.
boolean	equals(Object o) 判断两个 AbstractDatetimeWritable 是否相等.
long	get() 返回此 AbstractDatetimeWritable 的值
int	getNanos()
Timestamp	getTimestamp()
long	getTotalSeconds()
int	hashCode() 计算哈希值，直接返回此 AbstractDatetimeWritable 的值.
void	readFields(DataInput in) 从指定的 DataInput in 反序列化.
void	set(long value) 设置 AbstractDatetimeWritable 的值
void	set(long seconds, int nanos)
void	setTimestamp(Timestamp ts)
String	toString()
void	write(DataOutput out) 序列化到指定的 DataOutput out.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

TimestampWritable

public TimestampWritable()

默认构造 datetime 值为0的 TimestampWritable.

TimestampWritable

public TimestampWritable(long time)

构造毫秒值为给定 value 的 TimestampWritable.

Parameters:

time - 精度为毫秒的时间刻度

TimestampWritable

public TimestampWritable(long seconds,
                         int nanos)

根据给定的秒以及纳秒刻度构造 TimestampWritable

Parameters:

seconds - 精度为秒的时间刻度

nanos - 秒以下精确到纳秒的时间刻度

Method Detail

get

public long get()

Description copied from class: AbstractDatetimeWritable

返回此 AbstractDatetimeWritable 的值

Overrides:

get in class AbstractDatetimeWritable<TimestampWritable>

Returns:

这个writable对应的时间刻度，精确到毫秒

set

public void set(long value)

Description copied from class: AbstractDatetimeWritable

设置 AbstractDatetimeWritable 的值

Overrides:

set in class AbstractDatetimeWritable<TimestampWritable>

Parameters:

value - 要设置的时间刻度值，精确到毫秒

getTotalSeconds

public long getTotalSeconds()

getNanos

public int getNanos()

getTimestamp

public Timestamp getTimestamp()

setTimestamp

public void setTimestamp(Timestamp ts)

set

public void set(long seconds,
                int nanos)

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from interface: Writable

从指定的 DataInput in 反序列化.

Specified by:

readFields in interface Writable

Overrides:

readFields in class AbstractDatetimeWritable<TimestampWritable>

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Description copied from interface: Writable

序列化到指定的 DataOutput out.

Specified by:

write in interface Writable

Overrides:

write in class AbstractDatetimeWritable<TimestampWritable>

Throws:

IOException

equals

public boolean equals(Object o)

Description copied from class: AbstractDatetimeWritable

判断两个 AbstractDatetimeWritable 是否相等.

如果两个都是 AbstractDatetimeWritable 且值相等，返回true，否则返回false

Overrides:

equals in class AbstractDatetimeWritable<TimestampWritable>

hashCode

public int hashCode()

Description copied from class: AbstractDatetimeWritable

计算哈希值，直接返回此 AbstractDatetimeWritable 的值.

Overrides:

hashCode in class AbstractDatetimeWritable<TimestampWritable>

compareTo

public int compareTo(TimestampWritable o)

Description copied from class: AbstractDatetimeWritable

比较两个 AbstractDatetimeWritable 的值.

Specified by:

compareTo in interface Comparable<TimestampWritable>

Overrides:

compareTo in class AbstractDatetimeWritable<TimestampWritable>

Parameters:

o - 比较对象

Returns:

(this < o ? -1 : (this == o) ? 0 ：1))

toString

public String toString()

Overrides:

toString in class AbstractDatetimeWritable<TimestampWritable>