org.apache.hadoop.io
Class BinaryComparable

java.lang.Object
  extended by org.apache.hadoop.io.BinaryComparable
All Implemented Interfaces:
Comparable<BinaryComparable>
Direct Known Subclasses:
BytesWritable, Text

public abstract class BinaryComparable
extends Object
implements Comparable<BinaryComparable>

Interface supported by WritableComparable types supporting ordering/permutation by a representative set of bytes.


Constructor Summary
BinaryComparable()
           
 
Method Summary
 int compareTo(BinaryComparable other)
          Compare bytes from {#getBytes()}.
 int compareTo(byte[] other, int off, int len)
          Compare bytes from {#getBytes()} to those provided.
 boolean equals(Object other)
          Return true if bytes from {#getBytes()} match.
abstract  byte[] getBytes()
          Return representative byte array for this instance.
abstract  int getLength()
          Return n st bytes 0..n-1 from {#getBytes()} are valid.
 int hashCode()
          Return a hash of the bytes returned from {#getBytes()}.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

BinaryComparable

public BinaryComparable()
Method Detail

getLength

public abstract int getLength()
Return n st bytes 0..n-1 from {#getBytes()} are valid.


getBytes

public abstract byte[] getBytes()
Return representative byte array for this instance.


compareTo

public int compareTo(BinaryComparable other)
Compare bytes from {#getBytes()}.

Specified by:
compareTo in interface Comparable<BinaryComparable>
See Also:
WritableComparator.compareBytes(byte[],int,int,byte[],int,int)

compareTo

public int compareTo(byte[] other,
                     int off,
                     int len)
Compare bytes from {#getBytes()} to those provided.


equals

public boolean equals(Object other)
Return true if bytes from {#getBytes()} match.

Overrides:
equals in class Object

hashCode

public int hashCode()
Return a hash of the bytes returned from {#getBytes()}.

Overrides:
hashCode in class Object
See Also:
WritableComparator.hashBytes(byte[],int)


Copyright © 2009 The Apache Software Foundation