[rfc][icedtea-web] PolicyEditor empty entries save to file

[Andrew Azores]

Hi,

This patch makes it so that "empty" codebase entries (those with no 
permissions applied to them) will still be written to the policy file, 
so that on re-open, the "empty" codebase is still present. A special 
exception is added for the default "All Applets" codebase, since it 
always appears in the editor anyway and it doesn't make sense to have a 
persistent empty entry in that case.

For example:
1) policyeditor -file .config/icedtea-web/security/java.policy
2) add a new codebase which isn't already present, eg http://example.com
3) save the file
4) $EDITOR config/icedtea-web/security/java.policy - verify the empty 
"grant codeBase http://example/com" block is present
5) policyeditor -file .config/icedtea-web/security/java.policy - verify 
the example.com codebase appears and has no permissions applied

ChangeLog:

Empty codebase entries in PolicyEditor are saved to file
* netx/net/sourceforge/jnlp/security/policyeditor/PolicyEditor.java 
(savePolicyFile): fileLock made final, enabledPermissions declaration 
moved closer to usage
* netx/net/sourceforge/jnlp/security/policyeditor/PolicyEntry.java 
(toString): add codebase.isEmpty() condition to returning empty string 
result

Thanks,

-- 
Andrew A

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