Class MimeDetector

java.lang.Object
eu.medsea.mimeutil.detector.MimeDetector
Direct Known Subclasses:
ExtensionMimeDetector, MagicMimeMimeDetector, OpendesktopMimeDetector, TextMimeDetector, WindowsRegistryMimeDetector
public abstract class MimeDetector extends Object
ALL MimeDetector(s) must extend this class.

  • Constructor Details

    • MimeDetector

      public MimeDetector()

  • Method Details

    • getName

      public final String getName()
      Gets the name of this MimeDetector
      Returns:
      name of MimeDetector as a fully qualified class name

    • getMimeTypes

      public final Collection getMimeTypes(String fileName) throws UnsupportedOperationException
      Called by MimeUtil.MimeDetectorRegistry.getMimeTypes(String fileName) {}
      Parameters:
      fileName -
      Returns:
      Throws:
      UnsupportedOperationException

    • getMimeTypes

      public final Collection getMimeTypes(File file) throws UnsupportedOperationException
      Called by MimeUtil.MimeDetectorRegistry.getMimeTypes(File file) {}
      Parameters:
      fileName -
      Returns:
      Throws:
      UnsupportedOperationException

    • getMimeTypes

      public final Collection getMimeTypes(URL url) throws UnsupportedOperationException
      Called by MimeUtil.MimeDetectorRegistry.getMimeTypes(URL url) {}
      Parameters:
      fileName -
      Returns:
      Throws:
      UnsupportedOperationException

    • getMimeTypes

      public final Collection getMimeTypes(byte[] data) throws UnsupportedOperationException
      Called by MimeUtil.MimeDetectorRegistry.getMimeTypes(byte [] data) {}
      Parameters:
      fileName -
      Returns:
      Throws:
      UnsupportedOperationException

    • getMimeTypes

      public final Collection getMimeTypes(InputStream in) throws UnsupportedOperationException
      Called by MimeUtil.MimeDetectorRegistry.getMimeTypes(InputStream in) {} The InputStream must support the mark() and reset() methods.
      Parameters:
      fileName -
      Returns:
      Throws:
      UnsupportedOperationException

    • init

      public void init()
      You can override this method if you have any special one off initialisation to perform such as allocating resources etc.

    • delete

      public 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.

    • getDescription

      public abstract String getDescription()
      Abstract method to be implement by concrete MimeDetector(s).
      Returns:
      description of this MimeDetector

    • getMimeTypesFileName

      protected abstract Collection getMimeTypesFileName(String fileName) throws UnsupportedOperationException
      Abstract method that must be implemented by concrete MimeDetector(s). This takes a file name and is called by the MimeUtil getMimeTypes(String fileName) getMimeTypes(File file) getMimeTypes(URL url) methods. If your MimeDetector does not handle file names then either throw an UnsupportedOperationException or return an empty collection.
      Parameters:
      fileName -
      Returns:
      Collection of matched MimeType(s)
      Throws:
      UnsupportedOperationException

    • getMimeTypesFile

      protected abstract Collection getMimeTypesFile(File file) throws UnsupportedOperationException
      Abstract method that must be implemented by concrete MimeDetector(s). This takes a file object and is called by the MimeUtil getMimeTypes(File file) method. If your MimeDetector does not handle file names then either throw an UnsupportedOperationException or return an empty collection.
      Parameters:
      file -
      Returns:
      Collection of matched MimeType(s)
      Throws:
      UnsupportedOperationException

    • getMimeTypesURL

      protected abstract Collection getMimeTypesURL(URL url) throws UnsupportedOperationException
      Abstract method that must be implemented by concrete MimeDetector(s). This takes a URL object and is called by the MimeUtil getMimeTypes(URL url) method. If your MimeDetector does not handle file names then either throw an UnsupportedOperationException or return an empty collection.
      Parameters:
      file -
      Returns:
      Collection of matched MimeType(s)
      Throws:
      UnsupportedOperationException

    • getMimeTypesInputStream

      protected abstract Collection getMimeTypesInputStream(InputStream in) throws UnsupportedOperationException
      Abstract method that must be implemented by concrete MimeDetector(s). This takes an InputStream object and is called by the MimeUtil getMimeTypes(URL url), getMimeTypes(File file) and getMimeTypes(InputStream in) methods. If your MimeDetector does not handle InputStream objects then either throw an UnsupportedOperationException or return an empty collection.

      If the InputStream passed in does not support the mark() and reset() methods a MimeException will be thrown before reaching this point. The implementation is responsible for the actual use of the mark() and reset() methods as the amount of data to retrieve from the stream is implementation and even call by call dependent. If you do not use the mark() and reset() methods on the Stream then the position in the Stream will have moved on when this method returns and the next MimeDetector that handles the stream will either fail or be incorrect.

      To allow the reuse of the Stream in other parts of your code and by further MimeDetector(s) in a way that it is unaware of any data read via this method i.e. the Stream position will be returned to where it was when this method was called, it is IMPORTANT to utilise the mark() and reset() methods within your implementing method.

      Parameters:
      in - InputStream.
      Returns:
      Collection of matched MimeType(s)
      Throws:
      UnsupportedOperationException

    • getMimeTypesByteArray

      protected abstract Collection getMimeTypesByteArray(byte[] data) throws UnsupportedOperationException
      Abstract method that must be implemented by concrete MimeDetector(s). This takes a byte [] object and is called by the MimeUtil getMimeTypes(byte []) method. If your MimeDetector does not handle byte [] objects then either throw an UnsupportedOperationException or return an empty collection.
      Parameters:
      data - byte []. Is a byte array that you want to parse for matching mime types.
      Returns:
      Collection of matched MimeType(s)
      Throws:
      UnsupportedOperationException

    • closeStream

      protected static InputStream closeStream(InputStream in)