RFR 8144355: JDK 9 changes to ZipFileSystem to support multi-release jar files

[Steve Drach]

Hi,

I sent this out a week ago.   Resending to bump it to the top of the stack.

Please review the changes and additions to ZipFileSystem to support multi-release jars as described in JEP 238 <http://openjdk.java.net/jeps/238>.

The strategy is, if a file system is created over a multi-release jar,  a map of root entries to versioned entries for a specific platform release version is constructed.  The desired platform release version is configured through the the env parameter given to the FileSystem.newFileSystem method.  Then when a root entry is requested, the map is consulted and if a mapping is found, the corresponding versioned entry is returned.  Very similar to symbolic links.

Issue: https://bugs.openjdk.java.net/browse/JDK-8144355 <https://bugs.openjdk.java.net/browse/JDK-8144355>

Change to modules.xml: http://cr.openjdk.java.net/~sdrach/8144355/top/webrev.00/index.html <http://cr.openjdk.java.net/~sdrach/8144355/top/webrev.00/index.html>

Changes to ZipFileSystem: http://cr.openjdk.java.net/~sdrach/8144355/jdk/webrev.00/index.html <http://cr.openjdk.java.net/~sdrach/8144355/jdk/webrev.00/index.html>

Thanks,
Steve

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