ByteRange (HBase - Common 0.98.10-hadoop2 API)

All Superinterfaces:

Comparable<ByteRange>

All Known Subinterfaces:

PositionedByteRange

All Known Implementing Classes:

SimpleByteRange, SimplePositionedByteRange
```
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface ByteRange
extends Comparable<ByteRange>
```
Lightweight, reusable class for specifying ranges of byte[]'s.
ByteRange maintains an underlying byte[] and a viewport into that byte[] as a range of bytes. The ByteRange is a mutable, reusable object, so the underlying byte[] can be modified after instantiation. This is done using the set(byte[]) and unset() methods. Direct access to the byte[] is also available via getBytes(). The viewport is defined by an offset into the byte[] and a length. The range of bytes is 0-indexed, and is accessed by index via the get(int) and put(int, byte) methods.

This interface differs from ByteBuffer:
On-heap bytes only
Raw byte access only; does not encode other primitives.
Implements equals(Object), #hashCode(), and #compareTo(ByteRange) so that it can be used in standard java Collections. Comparison operations are lexicographic, which is native to HBase.
Allows the addition of simple core methods like the deep and shallow copy methods.
Can be reused in tight loops like a major compaction which can save significant amounts of garbage. (Without reuse, we throw off garbage like this thing.)

Mutable, and always evaluates #equals(Object), #hashCode(), and #compareTo(ByteRange) based on the current contents.

Can contain convenience methods for comparing, printing, cloning, spawning new arrays, copying to other arrays, etc. Please place non-core methods into ByteRangeUtils.

Method Summary

Methods
Modifier and Type	Method and Description
`ByteRange`	`deepCopy()` Create a new `ByteRange` with new backing byte[] containing a copy of the content from `this` range's window.
`void`	`deepCopySubRangeTo(int innerOffset, int copyLength, byte[] destination, int destinationOffset)` Wrapper for System.arraycopy.
`void`	`deepCopyTo(byte[] destination, int destinationOffset)` Wrapper for System.arraycopy.
`byte[]`	`deepCopyToNewArray()` Instantiate a new byte[] with exact length, which is at least 24 bytes + length.
`byte`	`get(int index)` Retrieve the byte at `index`.
`ByteRange`	`get(int index, byte[] dst)` Fill `dst` with bytes from the range, starting from `index`.
`ByteRange`	`get(int index, byte[] dst, int offset, int length)` Fill `dst` with bytes from the range, starting from `index`.
`byte[]`	`getBytes()` The underlying byte[].
`int`	`getLength()` The length of the range.
`int`	`getOffset()` The offset, the index into the underlying byte[] at which this range begins.
`boolean`	`isEmpty()`
`ByteRange`	`put(int index, byte val)` Store `val` at `index`.
`ByteRange`	`put(int index, byte[] val)` Store `val` at `index`.
`ByteRange`	`put(int index, byte[] val, int offset, int length)` Store `length` bytes from `val` into this range, starting at `index`.
`ByteRange`	`set(byte[] bytes)` Reuse this `ByteRange` over a new byte[].
`ByteRange`	`set(byte[] bytes, int offset, int length)` Reuse this `ByteRange` over a new byte[].
`ByteRange`	`set(int capacity)` Reuse this `ByteRange` over a new byte[].
`ByteRange`	`setLength(int length)` Update the length of this range.
`ByteRange`	`setOffset(int offset)` Update the beginning of this range.
`ByteRange`	`shallowCopy()` Create a new `ByteRange` that points at this range's byte[].
`ByteRange`	`shallowCopySubRange(int innerOffset, int copyLength)` Create a new `ByteRange` that points at this range's byte[].
`ByteRange`	`unset()` Nullifies this ByteRange.

Methods inherited from interface java.lang.Comparable
compareTo

- Method Detail
  - getBytes
```
byte[] getBytes()
```
    The underlying byte[].
  - unset
```
ByteRange unset()
```
    Nullifies this ByteRange. That is, it becomes a husk, being a range over no byte[] whatsoever.
    
    Returns:
    this
  - set
```
ByteRange set(int capacity)
```
    Reuse this ByteRange over a new byte[]. offset is set to 0 and length is set to capacity.
    
    Parameters:
    capacity - the size of a new byte[].
    
    Returns:
    this
  - set
```
ByteRange set(byte[] bytes)
```
    Reuse this ByteRange over a new byte[]. offset is set to 0 and length is set to bytes.length. A null bytes IS supported, in which case this method will behave equivalently to unset().
    
    Parameters:
    bytes - the array to wrap.
    
    Returns:
    this
  - set
```
ByteRange set(byte[] bytes,
            int offset,
            int length)
```
    Reuse this ByteRange over a new byte[]. A null bytes IS supported, in which case this method will behave equivalently to unset(), regardless of the values of offset and length.
    
    Parameters:
    bytes - The array to wrap.
    offset - The offset into bytes considered the beginning of this range.
    length - The length of this range.
    
    Returns:
    this.
  - getOffset
```
int getOffset()
```
    The offset, the index into the underlying byte[] at which this range begins.
    
    See Also:
    getBytes()
  - setOffset
```
ByteRange setOffset(int offset)
```
    Update the beginning of this range. offset + length may not be greater than bytes.length.
    
    Parameters:
    offset - the new start of this range.
    
    Returns:
    this.
  - getLength
```
int getLength()
```
    The length of the range.
  - setLength
```
ByteRange setLength(int length)
```
    Update the length of this range. offset + length should not be greater than bytes.length.
    
    Parameters:
    length - The new length of this range.
    
    Returns:
    this.
  - isEmpty
```
boolean isEmpty()
```
    Returns:
    true when this range is of zero length, false otherwise.
  - get
```
byte get(int index)
```
    Retrieve the byte at index.
    
    Parameters:
    index - zero-based index into this range.
    
    Returns:
    single byte at index.
  - get
```
ByteRange get(int index,
            byte[] dst)
```
    Fill dst with bytes from the range, starting from index.
    
    Parameters:
    index - zero-based index into this range.
    dst - the destination of the copy.
    
    Returns:
    this.
  - get
```
ByteRange get(int index,
            byte[] dst,
            int offset,
            int length)
```
    Fill dst with bytes from the range, starting from index. length bytes are copied into dst, starting at offset.
    
    Parameters:
    index - zero-based index into this range.
    dst - the destination of the copy.
    offset - the offset into dst to start the copy.
    length - the number of bytes to copy into dst.
    
    Returns:
    this.
  - put
```
ByteRange put(int index,
            byte val)
```
    Store val at index.
    
    Parameters:
    index - the index in the range where val is stored.
    val - the value to store.
    
    Returns:
    this.
  - put
```
ByteRange put(int index,
            byte[] val)
```
    Store val at index.
    
    Parameters:
    index - the index in the range where val is stored.
    val - the value to store.
    
    Returns:
    this.
  - put
```
ByteRange put(int index,
            byte[] val,
            int offset,
            int length)
```
    Store length bytes from val into this range, starting at index. Bytes from val are copied starting at offset into the range.
    
    Parameters:
    index - position in this range to start the copy.
    val - the value to store.
    offset - the offset in val from which to start copying.
    length - the number of bytes to copy from val.
    
    Returns:
    this.
  - deepCopyToNewArray
```
byte[] deepCopyToNewArray()
```
    Instantiate a new byte[] with exact length, which is at least 24 bytes + length. Copy the contents of this range into it.
    
    Returns:
    The newly cloned byte[].
  - deepCopy
```
ByteRange deepCopy()
```
    Create a new ByteRange with new backing byte[] containing a copy of the content from this range's window.
    
    Returns:
    Deep copy
  - deepCopyTo
```
void deepCopyTo(byte[] destination,
              int destinationOffset)
```
    Wrapper for System.arraycopy. Copy the contents of this range into the provided array.
    
    Parameters:
    destination - Copy to this array
    destinationOffset - First index in the destination array.
  - deepCopySubRangeTo
```
void deepCopySubRangeTo(int innerOffset,
                      int copyLength,
                      byte[] destination,
                      int destinationOffset)
```
    Wrapper for System.arraycopy. Copy the contents of this range into the provided array.
    
    Parameters:
    innerOffset - Start copying from this index in this source ByteRange. First byte copied is bytes[offset + innerOffset]
    copyLength - Copy this many bytes
    destination - Copy to this array
    destinationOffset - First index in the destination array.
  - shallowCopy
```
ByteRange shallowCopy()
```
    Create a new ByteRange that points at this range's byte[]. Modifying the shallowCopy will modify the bytes in this range's array. Pass over the hash code if it is already cached.
    
    Returns:
    new ByteRange object referencing this range's byte[].
  - shallowCopySubRange
```
ByteRange shallowCopySubRange(int innerOffset,
                            int copyLength)
```
    Create a new ByteRange that points at this range's byte[]. The new range can have different values for offset and length, but modifying the shallowCopy will modify the bytes in this range's array. Pass over the hash code if it is already cached.
    
    Parameters:
    innerOffset - First byte of clone will be this.offset + copyOffset.
    copyLength - Number of bytes in the clone.
    
    Returns:
    new ByteRange object referencing this range's byte[].

Interface ByteRange

Method Summary

Methods inherited from interface java.lang.Comparable

Method Detail

getBytes

unset

set

set

set

getOffset

setOffset

getLength

setLength

isEmpty

get

get

get

put

put

put

deepCopyToNewArray

deepCopy

deepCopyTo

deepCopySubRangeTo

shallowCopy

shallowCopySubRange