org.apache.hadoop.hbase.io

类 ImmutableBytesWritable

java.lang.Object

org.apache.hadoop.hbase.io.ImmutableBytesWritable

所有已实现的接口:

Comparable<ImmutableBytesWritable>, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable<ImmutableBytesWritable>

@InterfaceAudience.Public
@InterfaceStability.Stable
public class ImmutableBytesWritable
extends Object
implements org.apache.hadoop.io.WritableComparable<ImmutableBytesWritable>

A byte sequence that is usable as a key or value. Based on BytesWritable only this class is NOT resizable and DOES NOT distinguish between the size of the sequence and the current capacity as BytesWritable does. Hence its comparatively 'immutable'. When creating a new instance of this class, the underlying byte [] is not copied, just referenced. The backing buffer is accessed when we go to serialize.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	ImmutableBytesWritable.Comparator A Comparator optimized for ImmutableBytesWritable.

构造器概要

构造器

构造器和说明
ImmutableBytesWritable() Create a zero-size sequence.
ImmutableBytesWritable(byte[] bytes) Create a ImmutableBytesWritable using the byte array as the initial value.
ImmutableBytesWritable(byte[] bytes, int offset, int length) Set the value to a given byte range
ImmutableBytesWritable(ImmutableBytesWritable ibw) Set the new ImmutableBytesWritable to the contents of the passed ibw.

方法概要

方法

限定符和类型	方法和说明
int	compareTo(byte[] that) Compares the bytes in this object to the specified byte array
int	compareTo(ImmutableBytesWritable that) Define the sort order of the BytesWritable.
byte[]	copyBytes() Returns a copy of the bytes referred to by this writable
boolean	equals(Object right_obj)
byte[]	get() Get the data from the BytesWritable.
int	getLength()
int	getOffset()
int	getSize() 已过时。 since 0.98.5. Use getLength() instead
int	hashCode()
void	readFields(DataInput in)
void	set(byte[] b)
void	set(byte[] b, int offset, int length)
static byte[][]	toArray(List<byte[]> array)
String	toString()
void	write(DataOutput out)

从类继承的方法 java.lang.Object

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

构造器详细资料

ImmutableBytesWritable

public ImmutableBytesWritable()

Create a zero-size sequence.

ImmutableBytesWritable

public ImmutableBytesWritable(byte[] bytes)

Create a ImmutableBytesWritable using the byte array as the initial value.

参数:

bytes - This array becomes the backing storage for the object.

ImmutableBytesWritable

public ImmutableBytesWritable(ImmutableBytesWritable ibw)

Set the new ImmutableBytesWritable to the contents of the passed ibw.

参数:

ibw - the value to set this ImmutableBytesWritable to.

ImmutableBytesWritable

public ImmutableBytesWritable(byte[] bytes,
                      int offset,
                      int length)

Set the value to a given byte range

参数:

bytes - the new byte range to set to

offset - the offset in newData to start at

length - the number of bytes in the range

方法详细资料

get

public byte[] get()

Get the data from the BytesWritable.

返回:

The data is only valid between offset and offset+length.

set

public void set(byte[] b)

参数:

b - Use passed bytes as backing array for this instance.

set

public void set(byte[] b,
       int offset,
       int length)

参数:

b - Use passed bytes as backing array for this instance.

offset -

length -

getSize

@Deprecated
public int getSize()

已过时。 since 0.98.5. Use getLength() instead

返回:

the number of valid bytes in the buffer

另请参阅:

getLength(), HBASE-11561

getLength

public int getLength()

返回:

the number of valid bytes in the buffer

getOffset

public int getOffset()

返回:

offset

readFields

public void readFields(DataInput in)
                throws IOException

指定者:

readFields 在接口中 org.apache.hadoop.io.Writable

抛出:

IOException

write

public void write(DataOutput out)
           throws IOException

指定者:

write 在接口中 org.apache.hadoop.io.Writable

抛出:

IOException

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

compareTo

public int compareTo(ImmutableBytesWritable that)

Define the sort order of the BytesWritable.

指定者:

compareTo 在接口中 Comparable<ImmutableBytesWritable>

参数:

that - The other bytes writable

返回:

Positive if left is bigger than right, 0 if they are equal, and negative if left is smaller than right.

compareTo

public int compareTo(byte[] that)

Compares the bytes in this object to the specified byte array

参数:

that -

返回:

Positive if left is bigger than right, 0 if they are equal, and negative if left is smaller than right.

equals

public boolean equals(Object right_obj)

覆盖:

equals 在类中 Object

另请参阅:

Object.equals(java.lang.Object)

toString

public String toString()

覆盖:

toString 在类中 Object

另请参阅:

Object.toString()

toArray

public static byte[][] toArray(List<byte[]> array)

参数:

array - List of byte [].

返回:

Array of byte [].

copyBytes

public byte[] copyBytes()

Returns a copy of the bytes referred to by this writable