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copied!<p>If a requirement of your program is that the input files be well-formatted and not mixed-type, then I would recommend replacing your JSON and XML impls with the following:</p> <ol> <li><p>JSON - simply look for an opening '{' as one of the first chars in the file; this is an invalid format for any other files (except maybe script depending on your format). If you find '{' as the first char, its a JSON. This saves on processing the entire file with GSON.</p></li> <li><p>XML - look for file header; well-formed XML files cannot even have space before this header; it must appear immediately. Again, no reason to try and ingest the entire thing just to catch an exception.</p></li> <li><p>PROPERTIES - in the same vein, I would check the first line and make sure it has =\n format. If they do, you are good to go.</p></li> <li><p>SCRIPT - I am not sure the format of your scripting language, but you get the idea.</p></li> </ol> <p>All told, doing cheap/quick checks if your requirements are well-defined is the way to go here. If you require a JSON file to be all JSON and the first char you encounter reading the file is '{' then I'd say that is a JSON file and not EMPTY, XML or PROPERTIES (again, excluding SCRIPT because I don't know the format).</p> <p>Then you can rewind the input stream and give it to your parsing library to read (this is where <a href="http://docs.oracle.com/javase/7/docs/api/java/io/PushbackInputStream.html" rel="nofollow">PushbackInputStreams</a> can come handy)</p>

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