DO NOT REPLY [Bug 20474] New: - New Selector and improved documentation

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=20474

New Selector and improved documentation

           Summary: New Selector and improved documentation
           Product: Ant
           Version: 1.6Alpha (nightly)
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Core
        AssignedTo: dev@ant.apache.org
        ReportedBy: jan@materne.de


I wrote a Selector which can:
- compute a value of a file
- compare this value with one stored in a cache
- decide whether to select

The "compute" algorithm and the cache is configurable. Current implementations:
HashvalueAlgorithm: reads the file�s content into a String and uses its 
hashValue(), 
therefore only files are selected whichs CONTENT has changed
PropertyfileCache: use java.util.Properties for storing the key-value-pairs.

While writing the selector and its testcase I realized that the doco needs some 
improvents in that area. So I have done that, too.