Buffer (Hadoop 1.2.1 API)
Date: 2013-07-22

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## org.apache.hadoop.record
Class Buffer

    java.lang.Object
      org.apache.hadoop.record.Buffer

All Implemented Interfaces:
  Cloneable, Comparable

    public class Buffer

extends Object
implements Comparable, Cloneable

A byte sequence that is used as a Java native type for buffer. It is resizable and distinguishes between the count of the seqeunce and the current capacity.

Constructor Summary
`Buffer()` Create a zero-count sequence.
`Buffer(byte[] bytes)` Create a Buffer using the byte array as the initial value.
`Buffer(byte[] bytes, int offset, int length)` Create a Buffer using the byte range as the initial value.

Method Summary
`void` | `append(byte[] bytes)` Append specified bytes to the buffer
`void` | `append(byte[] bytes, int offset, int length)` Append specified bytes to the buffer.
`Object` | `clone()`
`int` | `compareTo(Object other)` Define the sort order of the Buffer.
`void` | `copy(byte[] bytes, int offset, int length)` Copy the specified byte array to the Buffer.
`boolean` | `equals(Object other)`
`byte[]` | `get()` Get the data from the Buffer.
`int` | `getCapacity()` Get the capacity, which is the maximum count that could handled without resizing the backing storage.
`int` | `getCount()` Get the current count of the buffer.
`int` | `hashCode()`
`void` | `reset()` Reset the buffer to 0 size
`void` | `set(byte[] bytes)` Use the specified bytes array as underlying sequence.
`void` | `setCapacity(int newCapacity)` Change the capacity of the backing storage.
`String` | `toString()`
`String` | `toString(String charsetName)` Convert the byte buffer to a string an specific character encoding
`void` | `truncate()` Change the capacity of the backing store to be the same as the current count of buffer.

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

Constructor Detail

### Buffer

    public Buffer()

  Create a zero-count sequence.

### Buffer

    public Buffer(byte[] bytes)

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

  Parameters:
    `bytes` - This array becomes the backing storage for the object.

### Buffer

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

  Create a Buffer using the byte range as the initial value.

  Parameters:
    `bytes` - Copy of this array becomes the backing storage for the object.
    `offset` - offset into byte array
    `length` - length of data

Method Detail

### set

    public void set(byte[] bytes)

  Use the specified bytes array as underlying sequence.

  Parameters:
    `bytes` - byte sequence

### copy

    public final void copy(byte[] bytes,
                           int offset,
                           int length)

  Copy the specified byte array to the Buffer. Replaces the current buffer.

  Parameters:
    `bytes` - byte array to be assigned
    `offset` - offset into byte array
    `length` - length of data

### get

    public byte[] get()

  Get the data from the Buffer.

  Returns:
    The data is only valid between 0 and getCount() - 1.

### getCount

    public int getCount()

  Get the current count of the buffer.

### getCapacity

    public int getCapacity()

  Get the capacity, which is the maximum count that could handled without resizing the backing storage.

  Returns:
    The number of bytes

### setCapacity

    public void setCapacity(int newCapacity)

  Change the capacity of the backing storage. The data is preserved if newCapacity >= getCount().

  Parameters:
    `newCapacity` - The new capacity in bytes.

### reset

    public void reset()

  Reset the buffer to 0 size

### truncate

    public void truncate()

  Change the capacity of the backing store to be the same as the current count of buffer.

### append

    public void append(byte[] bytes,
                       int offset,
                       int length)

  Append specified bytes to the buffer.

  Parameters:
    `bytes` - byte array to be appended
    `offset` - offset into byte array
    `length` - length of data

### append

    public void append(byte[] bytes)

  Append specified bytes to the buffer

  Parameters:
    `bytes` - byte array to be appended

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`

### compareTo

    public int compareTo(Object other)

  Define the sort order of the Buffer.

  Specified by:
    `compareTo` in interface `Comparable`
  Parameters:
    `other` - The other buffer
  Returns:
    Positive if this is bigger than other, 0 if they are equal, and negative if this is smaller than other.

### equals

    public boolean equals(Object other)

  Overrides:
    `equals` in class `Object`

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### toString

    public String toString(String charsetName)
                    throws UnsupportedEncodingException

  Convert the byte buffer to a string an specific character encoding

  Parameters:
    `charsetName` - Valid Java Character Set Name
  Throws:
    `UnsupportedEncodingException`

### clone

    public Object clone()
                 throws CloneNotSupportedException

  Overrides:
    `clone` in class `Object`
  Throws:
    `CloneNotSupportedException`

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