javax.activation
Class FileTypeMap
- java.lang.Object
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- javax.activation.FileTypeMap
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- Direct Known Subclasses:
- MimetypesFileTypeMap
public abstract class FileTypeMap extends Object
The FileTypeMap is an abstract class that provides a data typing interface for files. Implementations of this class will implement the getContentType methods which will derive a content type from a file name or a File object. FileTypeMaps could use any scheme to determine the data type, from examining the file extension of a file (like the MimetypesFileTypeMap) to opening the file and trying to derive its type from the contents of the file. The FileDataSource class uses the default FileTypeMap (a MimetypesFileTypeMap unless changed) to determine the content type of files.- Since:
- 1.6
- See Also:
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FileTypeMap,FileDataSource,MimetypesFileTypeMap
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Constructor Summary
Constructors Constructor and Description FileTypeMap()The default constructor.
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method and Description abstract StringgetContentType(File file)Return the type of the file object.abstract StringgetContentType(String filename)Return the type of the file passed in.static FileTypeMapgetDefaultFileTypeMap()Return the default FileTypeMap for the system.static voidsetDefaultFileTypeMap(FileTypeMap fileTypeMap)Sets the default FileTypeMap for the system.
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Method Detail
getContentType
public abstract String getContentType(File file)
Return the type of the file object. This method should always return a valid MIME type.- Parameters:
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file- A file to be typed. - Returns:
- The content type.
getContentType
public abstract String getContentType(String filename)
Return the type of the file passed in. This method should always return a valid MIME type.- Parameters:
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filename- the pathname of the file. - Returns:
- The content type.
setDefaultFileTypeMap
public static void setDefaultFileTypeMap(FileTypeMap fileTypeMap)
Sets the default FileTypeMap for the system. This instance will be returned to callers of getDefaultFileTypeMap.- Parameters:
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fileTypeMap- The FileTypeMap. - Throws:
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SecurityException- if the caller doesn't have permission to change the default
getDefaultFileTypeMap
public static FileTypeMap getDefaultFileTypeMap()
Return the default FileTypeMap for the system. If setDefaultFileTypeMap was called, return that instance, otherwise return an instance ofMimetypesFileTypeMap.- Returns:
- The default FileTypeMap
- See Also:
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setDefaultFileTypeMap(javax.activation.FileTypeMap)
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