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javax.activation

Class DataHandler

Implemented Interfaces:
Transferable
public class DataHandler
extends java.lang.Object
implements Transferable
Handler for data available in multiple sources and formats.

Constructor Summary

DataHandler(Object obj, String mimeType)
Constructor using a reified object representation.
DataHandler(URL url)
Constructor in which the data is read from a URL.
DataHandler(DataSource ds)
Constructor in which the data is read from a data source.

Method Summary

CommandInfo[]
getAllCommands()
Returns the complete list of commands for this type of data.
Object
getBean(CommandInfo cmdInfo)
Returns the instantiated bean using the specified command.
CommandInfo
getCommand(String cmdName)
Returns the specified command.
Object
getContent()
Returns the data as a reified object.
String
getContentType()
Returns the MIME type of the data (with parameters).
DataSource
getDataSource()
Returns the data source from which data is read.
InputStream
getInputStream()
Returns an input stream from which the data can be read.
String
getName()
Returns the name of the data object if created with a DataSource.
OutputStream
getOutputStream()
Returns an output stream that can be used to overwrite the underlying data, if the DataSource constructor was used.
CommandInfo[]
getPreferredCommands()
Returns the preferred commands for this type of data.
Object
getTransferData(DataFlavor flavor)
Returns an object representing the data to be transferred.
DataFlavor[]
getTransferDataFlavors()
Returns the data flavors in which this data is available.
boolean
isDataFlavorSupported(DataFlavor flavor)
Indicates whether the specified data flavor is supported for this data.
void
setCommandMap(CommandMap commandMap)
Sets the command map to be used by this data handler.
static void
setDataContentHandlerFactory(DataContentHandlerFactory newFactory)
Sets the data content handler factory.
void
writeTo(OutputStream os)
Writes the data as a byte stream.

Constructor Details

DataHandler

public DataHandler(Object obj,
                   String mimeType)
Constructor using a reified object representation.
Parameters:
obj - the object representation of the data
mimeType - the MIME type of the object

DataHandler

public DataHandler(URL url)
Constructor in which the data is read from a URL.
Parameters:
url - the URL

DataHandler

public DataHandler(DataSource ds)
Constructor in which the data is read from a data source.
Parameters:
ds - the data source

Method Details

getAllCommands

public CommandInfo[] getAllCommands()
Returns the complete list of commands for this type of data.

getBean

public Object getBean(CommandInfo cmdInfo)
Returns the instantiated bean using the specified command.
Parameters:
cmdInfo - the command to instantiate the bean with

getCommand

public CommandInfo getCommand(String cmdName)
Returns the specified command.
Parameters:
cmdName - the command name

getContent

public Object getContent()
            throws IOException
Returns the data as a reified object.

getContentType

public String getContentType()
Returns the MIME type of the data (with parameters).

getDataSource

public DataSource getDataSource()
Returns the data source from which data is read.

getInputStream

public InputStream getInputStream()
            throws IOException
Returns an input stream from which the data can be read.

getName

public String getName()
Returns the name of the data object if created with a DataSource.

getOutputStream

public OutputStream getOutputStream()
            throws IOException
Returns an output stream that can be used to overwrite the underlying data, if the DataSource constructor was used.

getPreferredCommands

public CommandInfo[] getPreferredCommands()
Returns the preferred commands for this type of data.

getTransferData

public Object getTransferData(DataFlavor flavor)
            throws UnsupportedFlavorException,
                   IOException
Returns an object representing the data to be transferred.
Parameters:
flavor - the requested data flavor

getTransferDataFlavors

public DataFlavor[] getTransferDataFlavors()
Returns the data flavors in which this data is available.

isDataFlavorSupported

public boolean isDataFlavorSupported(DataFlavor flavor)
Indicates whether the specified data flavor is supported for this data.

setCommandMap

public void setCommandMap(CommandMap commandMap)
Sets the command map to be used by this data handler. Setting to null uses the default command map.
Parameters:
commandMap - the command map to use

setDataContentHandlerFactory

public static void setDataContentHandlerFactory(DataContentHandlerFactory newFactory)
Sets the data content handler factory. If the factory has already been set, throws an Error.
Parameters:
newFactory - the factory to set

writeTo

public void writeTo(OutputStream os)
            throws IOException
Writes the data as a byte stream.
Parameters:
os - the stream to write to

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