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## org.modeshape.common.util
Class MimeTypeUtil

    java.lang.Object
      org.modeshape.common.util.MimeTypeUtil

    @Immutable
    public class MimeTypeUtil

extends Object

A simple utility that determines an appropriate MIME type by matching the extension of the supplied filename against a set of known file extensions.

This utility class may be instantiated to create a new instance with its own set of mappings. If desired, the default mappings will be loaded using the current thread's `context class loader`, and will be loaded from the `/org/modeshape/mime.types` file located on the classpath. The `load(InputStream, Map)` method may be used to load custom mappings (in the standard format) into a `Map` instance, which can then be passed to one of the constructors.

Field Summary
`static String` | `MIME_TYPE_EXTENSIONS_RESOURCE_PATH` The default location of the properties file containing the extension patterns to MIME types.

Constructor Summary
`MimeTypeUtil()` Create a default instance of the extension-based MIME type detector.
`MimeTypeUtil(Map<String,String> extensionsToMimeTypes)` Create an instance of the extension-based MIME type detector by using the supplied mappings.
`MimeTypeUtil(Map<String,String> extensionsToMimeTypes, boolean initWithDefaults)` Create an instance of the extension-based MIME type detector by using the supplied mappings.

Method Summary
`protected static Map<String,String>` | `getDefaultMappings()` Load the default extensions from `MIME_TYPE_EXTENSIONS_RESOURCE_PATH`, which can either be a property file or a tab-delimited *nix-style MIME types file (common in web servers and libraries).
`static Map<String,String>` | `load(InputStream stream, Map<String,Set<String>> duplicateMimeTypesByExtension)` Load the extensions from the supplied stream, which may provide the contents in the format of property file or a tab-delimited *nix-style MIME types file (common in web servers and libraries).
`String` | `mimeTypeOf(File file)` Returns the MIME-type of the file using its name.
`String` | `mimeTypeOf(String filename)` Returns the MIME-type of a file given the supplied name.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### MIME_TYPE_EXTENSIONS_RESOURCE_PATH

    public static final String MIME_TYPE_EXTENSIONS_RESOURCE_PATH

  The default location of the properties file containing the extension patterns to MIME types. Value is ""org/modeshape/mime.types" ".

  See Also:
    Constant Field Values

Constructor Detail

### MimeTypeUtil

    public MimeTypeUtil()

  Create a default instance of the extension-based MIME type detector. The set of extension patterns to MIME-types is loaded from the "org/modeshape/mime.types" classpath resource.

### MimeTypeUtil

    public MimeTypeUtil(Map<String,String> extensionsToMimeTypes)

  Create an instance of the extension-based MIME type detector by using the supplied mappings. The set of extension patterns to MIME-types is loaded from the "org/modeshape/mime.types" classpath resource, but the supplied extension mappings override any default mappings.

  Parameters:
    `extensionsToMimeTypes` - the mapping of extension patterns to MIME types, which will override the default mappings; may be null if the default mappings are to be used

### MimeTypeUtil

    public MimeTypeUtil(Map<String,String> extensionsToMimeTypes,
                        boolean initWithDefaults)

  Create an instance of the extension-based MIME type detector by using the supplied mappings. If requested, the set of extension patterns to MIME-types is loaded from the "org/modeshape/mime.types" classpath resource and any supplied extension mappings override any default mappings.

  Parameters:
    `extensionsToMimeTypes` - the mapping of extension patterns to MIME types, which will override the default mappings; may be null if the default mappings are to be used
    `initWithDefaults` - true if the default mappings are to be loaded first, or false if the default mappings are not to be used at all

Method Detail

### getDefaultMappings

    protected static Map<String,String> getDefaultMappings()

  Load the default extensions from `MIME_TYPE_EXTENSIONS_RESOURCE_PATH`, which can either be a property file or a tab-delimited *nix-style MIME types file (common in web servers and libraries). If an extension applies to more than one MIME type, the first one in the file wins.

  Returns:
    the default mappings; never null

### load

    public static Map<String,String> load(InputStream stream,
                                          Map<String,Set<String>> duplicateMimeTypesByExtension)

  Load the extensions from the supplied stream, which may provide the contents in the format of property file or a tab-delimited *nix-style MIME types file (common in web servers and libraries). If an extension applies to more than one MIME type, the first one in the file wins.

  Parameters:
    `stream` - the stream containing the content; may not be null
    `duplicateMimeTypesByExtension` - a map into which any extension should be placed if there are multiple MIME types that apply; may be null if this information is not required
  Returns:
    the default mappings; never null

### mimeTypeOf

    public String mimeTypeOf(String filename)

  Returns the MIME-type of a file given the supplied name. If the MIME-type cannot be determined, a `null` is returned.

  Parameters:
    `filename` - the file name; may be `null`.
  Returns:
    The MIME-type of the file, or optionally `null` if the MIME-type could not be determined.

### mimeTypeOf

    public String mimeTypeOf(File file)

  Returns the MIME-type of the file using its name. If the MIME-type cannot be determined, a `null` is returned.

  Parameters:
    `file` - the file; may be `null`.
  Returns:
    The MIME-type of the file, or optionally `null` if the MIME-type could not be determined.

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