ImmutableBytesWritable (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.io.ImmutableBytesWritable

All Implemented Interfaces:

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.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class ImmutableBytesWritable.Comparator
A Comparator optimized for ImmutableBytesWritable.

Nested Classes
Modifier and Type	Class and Description
`static class`	`ImmutableBytesWritable.Comparator` A Comparator optimized for ImmutableBytesWritable.

Field Summary

Fields
Modifier and Type Field and Description

private byte[] bytes

private int length

private int offset

Fields
Modifier and Type	Field and Description
`private byte[]`	`bytes`
`private int`	`length`
`private int`	`offset`

Constructor Summary

Constructors
Constructor and Description
`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`.

Method Summary

Methods
Modifier and Type	Method and Description
`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()` Deprecated. 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)`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - bytes
```
private byte[] bytes
```
  - offset
```
private int offset
```
  - length
```
private int length
```
- Constructor Detail
  - ImmutableBytesWritable
```
public ImmutableBytesWritable()
```
    Create a zero-size sequence.
  - ImmutableBytesWritable
```
public ImmutableBytesWritable(byte[] bytes)
```
    Create a ImmutableBytesWritable using the byte array as the initial value.
    
    Parameters:
    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.
    
    Parameters:
    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
    
    Parameters:
    bytes - the new byte range to set to
    offset - the offset in newData to start at
    length - the number of bytes in the range
- Method Detail
  - get
```
public byte[] get()
```
    Get the data from the BytesWritable.
    
    Returns:
    The data is only valid between offset and offset+length.
  - set
```
public void set(byte[] b)
```
    Parameters:
    b - Use passed bytes as backing array for this instance.
  - set
```
public void set(byte[] b,
       int offset,
       int length)
```
    Parameters:
    b - Use passed bytes as backing array for this instance.
    offset -
    length -
  - getSize
```
@Deprecated
public int getSize()
```
    Deprecated. use getLength() instead
    
    Returns:
    the number of valid bytes in the buffer
  - getLength
```
public int getLength()
```
    Returns:
    the number of valid bytes in the buffer
  - getOffset
```
public int getOffset()
```
    Returns:
    offset
  - 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
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - compareTo
```
public int compareTo(ImmutableBytesWritable that)
```
    Define the sort order of the BytesWritable.
    
    Specified by:
    
    compareTo in interface Comparable<ImmutableBytesWritable>
    
    Parameters:
    that - The other bytes writable
    
    Returns:
    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
    
    Parameters:
    that -
    
    Returns:
    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)
```
    Overrides:
    
    equals in class Object
    
    See Also:
    Object.equals(java.lang.Object)
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
    
    See Also:
    Object.toString()
  - toArray
```
public static byte[][] toArray(List<byte[]> array)
```
    Parameters:
    array - List of byte [].
    
    Returns:
    Array of byte [].
  - copyBytes
```
public byte[] copyBytes()
```
    Returns a copy of the bytes referred to by this writable

Class ImmutableBytesWritable

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

bytes

offset

length

Constructor Detail

ImmutableBytesWritable

ImmutableBytesWritable

ImmutableBytesWritable

ImmutableBytesWritable

Method Detail

get

set

set

getSize

getLength

getOffset

readFields

write

hashCode

compareTo

compareTo

equals

toString

toArray

copyBytes