eu.medsea.mimeutil.detector
Class OpendesktopMimeDetector

java.lang.Object
  eu.medsea.mimeutil.detector.MimeDetector
      eu.medsea.mimeutil.detector.OpendesktopMimeDetector

public class OpendesktopMimeDetector
extends MimeDetector

The Opendesktop shared mime database contains glob rules and magic number lookup information to enable applications to detect the mime types of files.

This class uses the mime.cache file which is one of the files created by the update-mime-database application. This file is a memory mapped file that enables the database to be updated and copied without interrupting applications.

This implementation follows the memory mapped spec so it is not required to restart an application using this mime detector should the underlying mime.cache database change.

For a complete description of the information contained in this file please see: http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html

This class also follows, where possible, the RECOMENDED order of detection as detailed in this spec. Thanks go to Mathias Clasen at Red Hat for pointing me to the original xdgmime implementation http://svn.gnome.org/viewvc/glib/trunk/gio/xdgmime/xdgmimecache.c?revision=7784&view=markup

Author:

Steven McArdle

Constructor Summary

OpendesktopMimeDetector()

OpendesktopMimeDetector(String mimeCacheFile)

Method Summary

void	delete() You can override this method if for instance you allocated any resources in the init() method that need to be closed or deallocated specially.
String	dump()
String	getDescription() Abstract method to be implement by concrete MimeDetector(s).
Collection	getMimeTypesByteArray(byte[] data) This method is unable to perform glob matching as no name is available.
Collection	getMimeTypesFile(File file) This method resolves mime types closely in accordance with the RECOMENDED order of detection detailed in the Opendesktop shared mime database specification http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html See the Recommended checking order.
Collection	getMimeTypesFileName(String fileName) This method resolves mime types closely in accordance with the RECOMENDED order of detection detailed in the Opendesktop shared mime database specification http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html See the Recommended checking order.
Collection	getMimeTypesInputStream(InputStream in) This method is unable to perform glob matching as no name is available.
Collection	getMimeTypesURL(URL url) This method resolves mime types closely in accordance with the RECOMENDED order of detection detailed in the Opendesktop shared mime database specification http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html See the Recommended checking order.

Methods inherited from class eu.medsea.mimeutil.detector.MimeDetector

closeStream, getMimeTypes, getMimeTypes, getMimeTypes, getMimeTypes, getMimeTypes, getName, init

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OpendesktopMimeDetector

public OpendesktopMimeDetector(String mimeCacheFile)

OpendesktopMimeDetector

public OpendesktopMimeDetector()

Method Detail

delete

public void delete()

Description copied from class: MimeDetector

You can override this method if for instance you allocated any resources in the init() method that need to be closed or deallocated specially.

Overrides:

delete in class MimeDetector

getDescription

public String getDescription()

Description copied from class: MimeDetector

Abstract method to be implement by concrete MimeDetector(s).

Specified by:

getDescription in class MimeDetector

Returns:

description of this MimeDetector

getMimeTypesFileName

public Collection getMimeTypesFileName(String fileName)

This method resolves mime types closely in accordance with the RECOMENDED order of detection detailed in the Opendesktop shared mime database specification http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html See the Recommended checking order.

Specified by:

getMimeTypesFileName in class MimeDetector

Returns:

Collection of matched MimeType(s)

getMimeTypesURL

public Collection getMimeTypesURL(URL url)

This method resolves mime types closely in accordance with the RECOMENDED order of detection detailed in the Opendesktop shared mime database specification http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html See the Recommended checking order.

Specified by:

getMimeTypesURL in class MimeDetector

Returns:

Collection of matched MimeType(s)

getMimeTypesFile

public Collection getMimeTypesFile(File file)
                            throws UnsupportedOperationException

This method resolves mime types closely in accordance with the RECOMENDED order of detection detailed in the Opendesktop shared mime database specification http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html See the Recommended checking order.

Specified by:

getMimeTypesFile in class MimeDetector

Returns:

Collection of matched MimeType(s)

Throws:

UnsupportedOperationException

getMimeTypesInputStream

public Collection getMimeTypesInputStream(InputStream in)
                                   throws UnsupportedOperationException

This method is unable to perform glob matching as no name is available. This means that it does not follow the recommended order of detection defined in the shared mime database spec http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html

Specified by:

getMimeTypesInputStream in class MimeDetector

Parameters:

in - InputStream.

Returns:

Collection of matched MimeType(s)

Throws:

UnsupportedOperationException

getMimeTypesByteArray

public Collection getMimeTypesByteArray(byte[] data)
                                 throws UnsupportedOperationException

This method is unable to perform glob matching as no name is available. This means that it does not follow the recommended order of detection defined in the shared mime database spec http://standards.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html

Specified by:

getMimeTypesByteArray in class MimeDetector

Parameters:

data - byte []. Is a byte array that you want to parse for matching mime types.

Returns:

Collection of matched MimeType(s)

Throws:

UnsupportedOperationException

dump

public String dump()