org.apache.hadoop.hive.serde2.columnar

Class BytesRefArrayWritable

java.lang.Object

org.apache.hadoop.hive.serde2.columnar.BytesRefArrayWritable

All Implemented Interfaces:

Comparable<BytesRefArrayWritable>, org.apache.hadoop.io.Writable

public class BytesRefArrayWritable
extends Object
implements org.apache.hadoop.io.Writable, Comparable<BytesRefArrayWritable>

BytesRefArrayWritable holds an array reference to BytesRefWritable, and is able to resize without recreating new array if not necessary.

Each BytesRefArrayWritable holds instance has a valid field, which is the desired valid number of BytesRefWritable it holds. resetValid can reset the valid, but it will not care the underlying BytesRefWritable.

Constructor Summary

Constructors

Constructor and Description
BytesRefArrayWritable() Constructs an empty array with a capacity of ten.
BytesRefArrayWritable(int capacity) Constructs an empty array with the specified capacity.

Method Summary

Methods

Modifier and Type	Method and Description
void	clear() Removes all elements.
int	compareTo(BytesRefArrayWritable other)
protected void	ensureCapacity(int newCapacity)
boolean	equals(Object o)
BytesRefWritable	get(int index) Gets the BytesRefWritable at the specified position.
void	readFields(DataInput in)
void	resetValid(int newValidCapacity) enlarge the capacity if necessary, to ensure that it can hold the number of elements specified by newValidCapacity argument.
void	set(int index, BytesRefWritable bytesRefWritable) Set the BytesRefWritable at the specified position with the specified BytesRefWritable.
int	size() Returns the number of valid elements.
BytesRefWritable	unCheckedGet(int index) Gets the BytesRefWritable at the specified position without checking.
void	write(DataOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

BytesRefArrayWritable

public BytesRefArrayWritable(int capacity)

Constructs an empty array with the specified capacity.

Parameters:

capacity - initial capacity

Throws:

IllegalArgumentException - if the specified initial capacity is negative

BytesRefArrayWritable

public BytesRefArrayWritable()

Constructs an empty array with a capacity of ten.

Method Detail

size

public int size()

Returns the number of valid elements.

Returns:

the number of valid elements

get

public BytesRefWritable get(int index)

Gets the BytesRefWritable at the specified position. Make sure the position is valid by first call resetValid.

Parameters:

index - the position index, starting from zero

Throws:

IndexOutOfBoundsException

unCheckedGet

public BytesRefWritable unCheckedGet(int index)

Gets the BytesRefWritable at the specified position without checking.

Parameters:

index - the position index, starting from zero

Throws:

IndexOutOfBoundsException

set

public void set(int index,
       BytesRefWritable bytesRefWritable)

Set the BytesRefWritable at the specified position with the specified BytesRefWritable.

Parameters:

index - index position

bytesRefWritable - the new element

Throws:

IllegalArgumentException - if the specified new element is null

compareTo

public int compareTo(BytesRefArrayWritable other)

Specified by:

compareTo in interface Comparable<BytesRefArrayWritable>

equals

public boolean equals(Object o)

Overrides:

equals in class Object

clear

public void clear()

Removes all elements.

resetValid

public void resetValid(int newValidCapacity)

enlarge the capacity if necessary, to ensure that it can hold the number of elements specified by newValidCapacity argument. It will also narrow the valid capacity when needed. Notice: it only enlarge or narrow the valid capacity with no care of the already stored invalid BytesRefWritable.

Parameters:

newValidCapacity - the desired capacity

ensureCapacity

protected void ensureCapacity(int newCapacity)

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException