org.apache.myfaces.util
Class HashMapUtils

java.lang.Object
  org.apache.myfaces.util.HashMapUtils

public class HashMapUtils

extends java.lang.Object

Version:

$Revision: 167257 $ $Date: 2004-10-13 07:51:02 -0400 (Wed, 13 Oct 2004) $

Author:

Anton Koinov (latest modification by $Author: matze $)

Constructor Summary

protected

HashMapUtils()

Method Summary

static int	calcCapacity(int size) Calculates initial capacity needed to hold size elements in a HashMap or Hashtable without forcing an expensive increase in internal capacity.
static java.util.HashMap	merge(java.util.Map map1, java.util.Map map2) Creates a new HashMap that has all of the elements of map1 and map2 (on key collision, the latter override the former).

Methods inherited from class java.lang.Object

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

Constructor Detail

HashMapUtils

protected HashMapUtils()

Method Detail

calcCapacity

public static final int calcCapacity(int size)

Calculates initial capacity needed to hold size elements in a HashMap or Hashtable without forcing an expensive increase in internal capacity. Capacity is based on the default load factor of .75.

Usage: Map map = new HashMap(HashMapUtils.calcCapacity(10));

Parameters:

size - the number of items that will be put into a HashMap

Returns:

initial capacity needed

merge

public static java.util.HashMap merge(java.util.Map map1,
                                      java.util.Map map2)

Creates a new HashMap that has all of the elements of map1 and map2 (on key collision, the latter override the former).

Parameters:

map1 - the fist hashmap to merge

map2 - the second hashmap to merge

Returns:

new hashmap