Module java.activation
Package javax.activation

Class FileDataSource

  • 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 setFileTypeMap method 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:
    DataSource, FileTypeMap, MimetypesFileTypeMap

    • 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:
        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:
        name - the system-dependent file name.

    • 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:
        getInputStream in interface DataSource
        Returns:
        an InputStream
        Throws:
        IOException - for failures creating the InputStream

      • 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:
        getOutputStream in interface DataSource
        Returns:
        an OutputStream
        Throws:
        IOException - for failures creating the OutputStream

      • 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 the getDefaultFileTypeMap method on FileTypeMap to acquire a default FileTypeMap. Note: By default, the FileTypeMap used will be a MimetypesFileTypeMap.
        Specified by:
        getContentType in interface DataSource
        Returns:
        the MIME Type
        See Also:
        FileTypeMap.getDefaultFileTypeMap()

      • getName

        public String getName​()
        Return the name of this object. The FileDataSource will return the file name of the object.
        Specified by:
        getName in interface DataSource
        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:
        map - The FileTypeMap for this object.