FieldImpl Extended: extractValues

Here are a couple additional methods for the FieldImpl class.  They
accomplish the same result as a call to "extract" followed by a call to
"getValues".  However, by eliminating the creation of a new Field (like
"extract" does), they run significantly faster.  I implemented them as a new
class that extends FieldImpl, but if you like them, you could add them into
FieldImpl itself.  These are based on the VisAD version with a doc/DATE of
Thu Nov 1 09:21:01 CST 2001.  (Is that the right way to identify a VisAD
version?)

 <<FieldImplExtended.java>> 

Attachment: FieldImplExtended.java
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