[icedtea-web] RFC: move TimedHashMap to netx

[Omair Majid]

Hi,

The attached patch moves TimeHashMap from 
plugin/icedteanp/java/sun/applet/PluginProxySelector.java to 
netx/net/sourceforge/jnlp/util/TimedHashMap.java, so other 
ProxySelectors can also use it. My patch for adding proxy auto config 
support will be using this new class.

Other than the movement, there are a few minor changes to it:
- It no longer extends HashMap. TimedHashMap did not override all the
   HashMap methods and it was possible to see inconsistent data. By
   reducing the interface, this should not be a problem any more (the
   plugin code still compiles fine).
- The use of Date has been replaced by System.nanoTime(). This should
   give us a more monotonic clock and be less susceptible to clock
   changes (especially to moving the clock backwards).

Any thoughts or concerns?

ChangeLog:

2011-02-14  Omair Majid  <omajid at redhat.com>

     * plugin/icedteanp/java/sun/applet/PluginProxySelector.java:
     Move TimedHashMap to its own class.
     * netx/net/sourceforge/jnlp/util/TimedHashMap.java: New class.
     Moved from sun.applet.PluginProxySelector. Do not subclass HashMap.
     Use System.nanoTime() instead of Date.getTime().

Cheers,
Omair
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