[cp-patches] [generics] Fix getenv() to work correctly.

[Andrew John Hughes]

Finally getting to test the getenv() method showed that it was
methodically buggy.  I'm committing the attached patch to fix this.
This makes the returned map a special sub-type of HashMap, wrapped
by Collections.unmodifiableMap.  This is required, so that queries
with null or non-String values result in an exception being thrown
(as specified in the documentation of this method).  The former method
manually created the unmodifiable map, and then fell into trouble
trying to initialise it...

Changelog:

2005-04-02  Andrew John Hughes  <address@hidden>

        * java/lang/System.java:
        (getenv()): Use Collections.unmodifiableMap to wrap an
        EnvironmentMap.
        (EnvironmentCollection): Reduced to just String check changes.
        (EnvironmentSet): Likewise.
        (EnvironmentMap): Likewise.
        (EnvironmentIterator): Removed.

-- 
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