/**
* Generate a Thumbnail of the input file. Try all available Thumbnailers and use the first that
* returns an image.
*
* <p>MIME-Detection narrows the selection of Thumbnailers to try:
* <li>First all Thumbnailers that declare to accept such a MIME Type are used
* <li>Then all Thumbnailers that declare to accept all possible MIME Types.
*
* @param input Input file that should be processed
* @param output File in which should be written
* @param mimeType MIME-Type of input file (null if unknown)
* @throws IOException If file cannot be read/written.
* @throws ThumbnailerException If the thumbnailing process failed (i.e., no thumbnailer could
* generate an Thumbnail. The last ThumbnailerException is re-thrown.)
*/
public void generateThumbnail(File input, File output, String mimeType)
throws IOException, ThumbnailerException {
FileDoesNotExistException.check(input, "The input file");
FileDoesNotExistException.checkWrite(output, "The output file", true, false);
boolean generated = false;
// MIME might be known already (in case of recursive thumbnail managers)
if (mimeType == null) {
mimeType = mimeTypeDetector.getMimeType(input);
mLog.debug("Detected Mime-Typ: " + mimeType);
}
if (mimeType != null) generated = executeThumbnailers(mimeType, input, output, mimeType);
// Try again using wildcard thumbnailers
if (!generated) generated = executeThumbnailers(ALL_MIME_WILDCARD, input, output, mimeType);
if (!generated)
throw new ThumbnailerException(
"No suitable Thumbnailer has been found. (File: "
+ input.getName()
+ " ; Detected MIME: "
+ mimeType
+ ")");
}
