Hi,



What is the best way to handle transforming a file to itself?



Currently I do:
File source = new File(servlet_context.getRealPath(_xml));
transformer.transform(new StreamSource(source), new StreamResult(source));

Is there any way to do buffered  reads and writes to this file? Is there 
a benefit to doing this?



Is there a way to use the new 1.4 non blocking I/O (java.nio)?

<random_thought> The code below should(?) work on the entire file, but 
could you possibly identify a section (nodeset) of an XML file and 
perform a transformation on it? Is this just silly?</random_thought>



I tried to do the following but I get an error in saxon 6.52 saying: 
(The requested operation cannot be performed on a file with a 
user-mapped section open)

--------

RandomAccessFile in = new RandomAccessFile(_context.getRealPath(_xml), 
"rw");

FileChannel channel = in.getChannel();

Charset set = Charset.forName("US-ASCII");

CharsetDecoder decoder = set.newDecoder();

MappedByteBuffer bytes = channel.map(FileChannel.MapMode.READ_WRITE, 0, 
(int)channel.size());

CharBuffer chars = decoder.decode(bytes);



StreamSource source = new StreamSource(new CharArrayReader(chars.array()));

StreamSource result_source = new StreamSource(new 
CharArrayReader(chars.array()),

                                   servlet_context.getRealPath(_xml));

StreamResult result = new StreamResult(result_source);



transformer.transform(source, result);
-----------

thanks for any help,
-Rob


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