org.limewire.collection
Class PowerOf2ByteArrayCache

java.lang.Object
  org.limewire.collection.PowerOf2ByteArrayCache

public class PowerOf2ByteArrayCache
extends java.lang.Object

Creates a byte array with a size that is a power of 2 (byte array size = 2^power). If you try to get a byte array with a size that is not a power of two, the value is set to the next power of 2. For example, setting a value of 511 returns a byte array of size 512 because 511 is not a power of 2 (2^8 = 256 and 2^9 = 512). (If you attempt to create a byte array less than a size zero (base 2^-2), the size is set to 1.)

Additionally, PowerOf2ByteArrayCache stores the total size of cached byte[]s.

    PowerOf2ByteArrayCache p2 = new PowerOf2ByteArrayCache();

    byte[] ba4 = p2.get(4);
    System.out.println("ba4 size: " + ba4.length + " cache size is " + p2.getCacheSize());

    byte[] ba5 = p2.get(5);
    System.out.println("ba5 size: " + ba5.length + " cache size is " + p2.getCacheSize());

    byte[] ba8 = p2.get(8);
    System.out.println("ba8 size: " + ba8.length + " cache size is " + p2.getCacheSize());

    byte[] ba9 = p2.get(9);
    System.out.println("ba9 size: " + ba9.length + " cache size is " + p2.getCacheSize());  

    Output:
        ba4 size: 4 cache size is 4
        ba5 size: 8 cache size is 12
        ba8 size: 8 cache size is 12
        ba9 size: 16 cache size is 28

  

Constructor Summary

PowerOf2ByteArrayCache()

Method Summary

void	clear() Erases all data in the cache.
byte[]	get(int size)
int	getCacheSize()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PowerOf2ByteArrayCache

public PowerOf2ByteArrayCache()

Method Detail

get

public byte[] get(int size)

Returns:

a byte array of the specified size, using cached one if possible.

getCacheSize

public int getCacheSize()

clear

public void clear()

Erases all data in the cache.