com.vaadin.util

Class FileTypeResolver

java.lang.Object

com.vaadin.util.FileTypeResolver

All Implemented Interfaces:

Serializable

public class FileTypeResolver
extends Object
implements Serializable

Utility class that can figure out mime-types and icons related to files.

Note : The icons are associated purely to mime-types, so a file may not have a custom icon accessible with this class.

Since:

3.0

Author:

Vaadin Ltd.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static Resource	DEFAULT_ICON Default icon given if no icon is specified for a mime-type.
static String	DEFAULT_MIME_TYPE Default mime-type.

Constructor Summary

Constructors

Constructor and Description
FileTypeResolver()

Method Summary

Modifier and Type	Method and Description
static void	addExtension(String extension, String MIMEType) Adds a mime-type mapping for the given filename extension.
static void	addIcon(String MIMEType, Resource icon) Adds a icon for the given mime-type.
static Map<String,String>	getExtensionToMIMETypeMapping() Gets the internal file extension to mime-type mapping.
static Resource	getIcon(File file) Gets the descriptive icon representing a file.
static Resource	getIcon(String fileName) Gets the descriptive icon representing file, based on the filename.
static String	getMIMEType(File file) Gets the mime-type for a file.
static String	getMIMEType(String fileName) Gets the mime-type of a file.
static Map<String,Resource>	getMIMETypeToIconMapping() Gets the internal mime-type to icon mapping.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_ICON

public static Resource DEFAULT_ICON

Default icon given if no icon is specified for a mime-type.

DEFAULT_MIME_TYPE

public static String DEFAULT_MIME_TYPE

Default mime-type.

Constructor Detail

FileTypeResolver

public FileTypeResolver()

Method Detail

getMIMEType

public static String getMIMEType(String fileName)

Gets the mime-type of a file. Currently the mime-type is resolved based only on the file name extension.

Parameters:

fileName - the name of the file whose mime-type is requested.

Returns:

mime-type String for the given filename

getIcon

public static Resource getIcon(String fileName)

Gets the descriptive icon representing file, based on the filename. First the mime-type for the given filename is resolved, and then the corresponding icon is fetched from the internal icon storage. If it is not found the default icon is returned.

Parameters:

fileName - the name of the file whose icon is requested.

Returns:

the icon corresponding to the given file

getIcon

public static Resource getIcon(File file)

Gets the descriptive icon representing a file. First the mime-type for the given file name is resolved, and then the corresponding icon is fetched from the internal icon storage. If it is not found the default icon is returned.

Parameters:

file - the file whose icon is requested.

Returns:

the icon corresponding to the given file

getMIMEType

public static String getMIMEType(File file)

Gets the mime-type for a file. Currently the returned file type is resolved by the filename extension only.

Parameters:

file - the file whose mime-type is requested.

Returns:

the files mime-type String

addExtension

public static void addExtension(String extension,
                                String MIMEType)

Adds a mime-type mapping for the given filename extension. If the extension is already in the internal mapping it is overwritten.

Parameters:

extension - the filename extension to be associated with MIMEType.

MIMEType - the new mime-type for extension.

addIcon

public static void addIcon(String MIMEType,
                           Resource icon)

Adds a icon for the given mime-type. If the mime-type also has a corresponding icon, it is replaced with the new icon.

Parameters:

MIMEType - the mime-type whose icon is to be changed.

icon - the new icon to be associated with MIMEType.

getExtensionToMIMETypeMapping

public static Map<String,String> getExtensionToMIMETypeMapping()

Gets the internal file extension to mime-type mapping.

Returns:

unmodifiable map containing the current file extension to mime-type mapping

getMIMETypeToIconMapping

public static Map<String,Resource> getMIMETypeToIconMapping()

Gets the internal mime-type to icon mapping.

Returns:

unmodifiable map containing the current mime-type to icon mapping