/**
* Use the fully qualified name of a MimeDetector and try to instantiate it if it's not already
* registered. If it's already registered then log a warning and return the already registered
* MimeDetector
*
* @param mimeDetector
* @return MimeDetector registered under this name. Returns null if an exception occurs
*/
MimeDetector registerMimeDetector(final String mimeDetector) {
if (mimeDetectors.containsKey(mimeDetector)) {
log.warn(
"MimeDetector ["
+ mimeDetector
+ "] will not be registered as a MimeDetector with this name is already registered.");
return (MimeDetector) mimeDetectors.get(mimeDetector);
}
// Create the mime detector if we can
try {
MimeDetector md = (MimeDetector) Class.forName(mimeDetector).newInstance();
md.init();
if (log.isDebugEnabled()) {
log.debug(
"Registering MimeDetector with name ["
+ md.getName()
+ "] and description ["
+ md.getDescription()
+ "]");
}
mimeDetectors.put(mimeDetector, md);
return md;
} catch (Exception e) {
log.error("Exception while registering MimeDetector [" + mimeDetector + "].", e);
}
// Failed to create an instance
return null;
}
MimeDetector unregisterMimeDetector(final String mimeDetector) {
if (mimeDetector == null) {
return null;
}
if (log.isDebugEnabled()) {
log.debug("Unregistering MimeDetector [" + mimeDetector + "] from registry.");
}
try {
MimeDetector md = (MimeDetector) mimeDetectors.get(mimeDetector);
if (md != null) {
md.delete();
return (MimeDetector) mimeDetectors.remove(mimeDetector);
}
} catch (Exception e) {
log.error("Exception while un-registering MimeDetector [" + mimeDetector + "].", e);
}
// Shouldn't get here
return null;
}
Collection getMimeTypes(final File file) throws MimeException {
Collection mimeTypes = new ArrayList();
try {
if (!EncodingGuesser.getSupportedEncodings().isEmpty()) {
mimeTypes = TextMimeDetector.getMimeTypes(file);
}
} catch (UnsupportedOperationException ignore) {
// The TextMimeDetector will throw this if it decides
// the content is not text
}
for (Iterator it = mimeDetectors.values().iterator(); it.hasNext(); ) {
try {
MimeDetector md = (MimeDetector) it.next();
mimeTypes.addAll(md.getMimeTypes(file));
} catch (UnsupportedOperationException usoe) {
// We ignore this as it indicates that this MimeDetector does not support
// Getting mime types from streams
} catch (Exception e) {
log.error(e.getLocalizedMessage(), e);
}
}
return mimeTypes;
}
/**
* unregister the MimeDetector from the list.
*
* @param mimeDetector the MimeDetector to unregister
* @return MimeDetector unregistered or null if it was not registered
*/
MimeDetector unregisterMimeDetector(final MimeDetector mimeDetector) {
if (mimeDetector == null) {
return null;
}
return unregisterMimeDetector(mimeDetector.getName());
}
