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

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## org.apache.hadoop.util.bloom
Class Key

    java.lang.Object
      org.apache.hadoop.util.bloom.Key

All Implemented Interfaces:
  Comparable<Key>, Writable, WritableComparable<Key>

    public class Key

extends Object
implements WritableComparable<Key>

The general behavior of a key that must be stored in a filter.

See Also:
  `The general behavior of a filter`

Constructor Summary
`Key()` default constructor - use with readFields
`Key(byte[] value)` Constructor.
`Key(byte[] value, double weight)` Constructor.

Method Summary
`int` | `compareTo(Key other)`
`boolean` | `equals(Object o)`
`byte[]` | `getBytes()`
`double` | `getWeight()`
`int` | `hashCode()`
`void` | `incrementWeight()` Increments the weight of this key by one.
`void` | `incrementWeight(double weight)` Increments the weight of this key with a specified value.
`void` | `readFields(DataInput in)` Deserialize the fields of this object from `in`.
`void` | `set(byte[] value, double weight)`
`void` | `write(DataOutput out)` Serialize the fields of this object to `out`.

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

Constructor Detail

### Key

    public Key()

  default constructor - use with readFields

### Key

    public Key(byte[] value)

  Constructor.

  Builds a key with a default weight.

  Parameters:
    `value` - The byte value of this key.

### Key

    public Key(byte[] value,
               double weight)

  Constructor.

  Builds a key with a specified weight.

  Parameters:
    `value` - The value of this key.
    `weight` - The weight associated to this key.

Method Detail

### set

    public void set(byte[] value,
                    double weight)

  Parameters:
    `value` -
    `weight` -

### getBytes

    public byte[] getBytes()

  Returns:
    byte[] The value of this key.

### getWeight

    public double getWeight()

  Returns:
    Returns the weight associated to this key.

### incrementWeight

    public void incrementWeight(double weight)

  Increments the weight of this key with a specified value.

  Parameters:
    `weight` - The increment.

### incrementWeight

    public void incrementWeight()

  Increments the weight of this key by one.

### equals

    public boolean equals(Object o)

  Overrides:
    `equals` in class `Object`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`

### write

    public void write(DataOutput out)
               throws IOException

  Description copied from interface: `Writable`
  Serialize the fields of this object to `out`.

  Specified by:
    `write` in interface `Writable`
  Parameters:
    `out` - `DataOuput` to serialize this object into.
  Throws:
    `IOException`

### readFields

    public void readFields(DataInput in)
                    throws IOException

  Description copied from interface: `Writable`
  Deserialize the fields of this object from `in`.

  For efficiency, implementations should attempt to re-use storage in the existing object where possible.

  Specified by:
    `readFields` in interface `Writable`
  Parameters:
    `in` - `DataInput` to deseriablize this object from.
  Throws:
    `IOException`

### compareTo

    public int compareTo(Key other)

  Specified by:
    `compareTo` in interface `Comparable<Key>`

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