org.jhotdraw.draw.io

Interface InputFormat

All Known Implementing Classes:

DOMStorableInputOutputFormat, ImageInputFormat, ODGInputFormat, SerializationInputOutputFormat, SVGInputFormat, SVGZInputFormat, TextInputFormat

public interface InputFormat

An input format implements a strategy for reading a Drawing using a specific format from either an InputStream, an URI or a Transferable.

Typically the format can be recognized by a Mime type or by a file extension. To identify the format used by a file, an appropriate FileFilter for a javax.swing.JFileChooser component can be requested from InputFormat.

This interface intentionally contains many identical operations like OutputFormat to make it easy, to write classes that implement both interfaces.

Design Patterns

Strategy
InputFormat encapsulates a strategy for reading drawings from input streams.
Strategy: InputFormat; Context: Drawing.

Method Summary

Modifier and Type	Method and Description
javax.swing.filechooser.FileFilter	getFileFilter() Return a FileFilter that can be used to identify files which can be read with this input format.
javax.swing.JComponent	getInputFormatAccessory() Return a JFileChooser accessory that can be used to customize the input format.
boolean	isDataFlavorSupported(java.awt.datatransfer.DataFlavor flavor) Returns true, if this InputFormat can readFigures TransferData using the specified DataFlavor.
void	read(java.io.InputStream in, Drawing drawing, boolean replace) Reads figures from a file and adds them to the specified drawing.
void	read(java.awt.datatransfer.Transferable t, Drawing drawing, boolean replace) Reads figures from the specified Transferable and adds them to the specified drawing.
void	read(java.net.URI uri, Drawing drawing) Reads figures from an URI and replaces the children of the drawing with them.
void	read(java.net.URI uri, Drawing drawing, boolean replace) Reads figures from an URI and adds them to the specified drawing.

Method Detail

getFileFilter

javax.swing.filechooser.FileFilter getFileFilter()

Return a FileFilter that can be used to identify files which can be read with this input format. Typically, each input format has its own recognizable file naming convention.

Returns:

FileFilter to be used with a javax.swing.JFileChooser

getInputFormatAccessory

@Nullable
javax.swing.JComponent getInputFormatAccessory()

Return a JFileChooser accessory that can be used to customize the input format.

Returns:

A JFileChooser accessory to be used with a javax.swing.JFileChooser Returns null, if no accessory is provided for this format.

read

void read(java.net.URI uri,
          Drawing drawing)
   throws java.io.IOException

Reads figures from an URI and replaces the children of the drawing with them.

This is a convenience method for calling read(URI,Drawing,true).

Parameters:

uri - The URI.

drawing - The drawing.

Throws:

java.io.IOException

read

void read(java.net.URI uri,
          Drawing drawing,
          boolean replace)
   throws java.io.IOException

Reads figures from an URI and adds them to the specified drawing.

Parameters:

uri - The URI.

drawing - The drawing.

replace - Set this to true, if the contents of the file replaces the contents of the drawing (for example, when loading a drawing from a file). Set this to false, to add the contents of the file to the drawing (for example, when the file has been dropped into the drawing view).

Throws:

java.io.IOException

read

void read(java.io.InputStream in,
          Drawing drawing,
          boolean replace)
   throws java.io.IOException

Reads figures from a file and adds them to the specified drawing.

Parameters:

in - The input stream.

drawing - The drawing.

replace - Set this to true, if the contents of the stream replaces the contents of the drawing (for example, when loading a drawing from a stream). Set this to false, to add the contents of the file to the drawing (for example, when the stream has been dropped into the drawing view).

Throws:

java.io.IOException

isDataFlavorSupported

boolean isDataFlavorSupported(java.awt.datatransfer.DataFlavor flavor)

Returns true, if this InputFormat can readFigures TransferData using the specified DataFlavor.

Parameters:

flavor - A DataFlavor.

read

void read(java.awt.datatransfer.Transferable t,
          Drawing drawing,
          boolean replace)
   throws java.awt.datatransfer.UnsupportedFlavorException,
          java.io.IOException

Reads figures from the specified Transferable and adds them to the specified drawing.

Parameters:

t - The Transferable.

drawing - The drawing.

replace - Set this to true, if the contents of the transferable replaces the contents of the drawing (for example, when loading a drawing from a transferable). Set this to false, to add the contents of the transferable to the drawing (for example, when the transferable has been dropped or pasted into the drawing view).

Throws:

java.awt.datatransfer.UnsupportedFlavorException

java.io.IOException