javax.activation
Class FileDataSource
- java.lang.Object
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- javax.activation.FileDataSource
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- All Implemented Interfaces:
- DataSource
public class FileDataSource extends Object implements DataSource
The FileDataSource class implements a simple DataSource object that encapsulates a file. It provides data typing services via a FileTypeMap object.FileDataSource Typing Semantics
The FileDataSource class delegates data typing of files to an object subclassed from the FileTypeMap class. The
setFileTypeMapmethod can be used to explicitly set the FileTypeMap for an instance of FileDataSource. If no FileTypeMap is set, the FileDataSource will call the FileTypeMap's getDefaultFileTypeMap method to get the System's default FileTypeMap.- Since:
- 1.6
- See Also:
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DataSource,FileTypeMap,MimetypesFileTypeMap
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Constructor Summary
Constructors Constructor and Description FileDataSource(File file)Creates a FileDataSource from a File object.FileDataSource(String name)Creates a FileDataSource from the specified path name.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description StringgetContentType()This method returns the MIME type of the data in the form of a string.FilegetFile()Return the File object that corresponds to this FileDataSource.InputStreamgetInputStream()This method will return an InputStream representing the the data and will throw an IOException if it can not do so.StringgetName()Return the name of this object.OutputStreamgetOutputStream()This method will return an OutputStream representing the the data and will throw an IOException if it can not do so.voidsetFileTypeMap(FileTypeMap map)Set the FileTypeMap to use with this FileDataSource
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Constructor Detail
FileDataSource
public FileDataSource(File file)
Creates a FileDataSource from a File object. Note: The file will not actually be opened until a method is called that requires the file to be opened.- Parameters:
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file- the file
FileDataSource
public FileDataSource(String name)
Creates a FileDataSource from the specified path name. Note: The file will not actually be opened until a method is called that requires the file to be opened.- Parameters:
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name- the system-dependent file name.
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Method Detail
getInputStream
public InputStream getInputStream() throws IOException
This method will return an InputStream representing the the data and will throw an IOException if it can not do so. This method will return a new instance of InputStream with each invocation.- Specified by:
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getInputStreamin interfaceDataSource - Returns:
- an InputStream
- Throws:
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IOException
getOutputStream
public OutputStream getOutputStream() throws IOException
This method will return an OutputStream representing the the data and will throw an IOException if it can not do so. This method will return a new instance of OutputStream with each invocation.- Specified by:
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getOutputStreamin interfaceDataSource - Returns:
- an OutputStream
- Throws:
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IOException
getContentType
public String getContentType()
This method returns the MIME type of the data in the form of a string. This method uses the currently installed FileTypeMap. If there is no FileTypeMap explictly set, the FileDataSource will call thegetDefaultFileTypeMapmethod on FileTypeMap to acquire a default FileTypeMap. Note: By default, the FileTypeMap used will be a MimetypesFileTypeMap.- Specified by:
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getContentTypein interfaceDataSource - Returns:
- the MIME Type
- See Also:
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FileTypeMap.getDefaultFileTypeMap()
getName
public String getName()
Return the name of this object. The FileDataSource will return the file name of the object.- Specified by:
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getNamein interfaceDataSource - Returns:
- the name of the object.
- See Also:
-
DataSource
getFile
public File getFile()
Return the File object that corresponds to this FileDataSource.- Returns:
- the File object for the file represented by this object.
setFileTypeMap
public void setFileTypeMap(FileTypeMap map)
Set the FileTypeMap to use with this FileDataSource- Parameters:
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map- The FileTypeMap for this object.
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