RFR: 8222276: (zipfs) Refactoring and cleanups to prepare for JDK-8213031

[Langer, Christoph]

Hi,

working on JDK-8213031 to add posix file permission support for the zipfs, I thought it makes sense to factor out some of the changes into a separate change. Those changes reorganize and clean up some parts of the code which I think makes sense in any case.

Please review:
Bug: https://bugs.openjdk.java.net/browse/JDK-8222276
Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8222276.0/

In detail:
The main change is to the hierarchy of inner classes ZipFileSystem.IndexNode and ZipFileSystem.Entry (the latter extends the former). Both classes are static classes currently. It makes sense, though, to have those associated with the ZipFileSystem they belong to.
To do that, I need to add a static superclass named ZFSNode which only holds a node name and its hashcode. This class needs to exist because of the lookup implementation to find specific nodes of tze ZipFileSystem in its node map. Then the classes IndexNode extends ZFSNode and Entry extends IndexNode can be made non-static.

Further changes are:
Improve error handling for ZipFileAttributeView::get methods
improve handling for zip64 attribute/version
minor clenaups such as adding @Override annotations, whitespace fixes, private method visibility etc.

Furthermore, there is some suspicious coding in JarFileSystem:: createVersionedLinks where a temporary key node is inserted into the alias map. However, this is a singleton instance which always gets new values. I'll open a separate bug for that and I'll try to create a test case which demonstrates an issue with the current code.

I ran the zipfs jtreg tests successfully and will put it into our internal system as well as run it through jdk-submit.

Thanks
Christoph

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