y.io
Class GMLIOHandler

java.lang.Object
  y.io.IOHandler
      y.io.GMLIOHandler

Direct Known Subclasses:

XGMLIOHandler

public class GMLIOHandler
extends IOHandler

Read and write a Graph2D in Graph Modeling Language (GML). This is mainly achieved by delegating the actual work to instances, that are created by EncoderFactory and ParserFactory.

For more information about GML refer to the official GML Page for the general format and compatibility and extension notes.

Constructor Summary

GMLIOHandler()
Instantiates a new GMLIOHandler.

Method Summary

static String	convertColor(Color col) Converts a java Color into standard string representation.
static Color	decodeColor(String colorString) Decodes a color string produced by convertColor(Color).
static EncoderFactory	getEncoderFactory() Getter for the ParserFactory (Singleton)
String	getFileFormatString() Returns the GML file format string.
String	getFileNameExtension() Returns the GML file name extension, i.e.
static ParserFactory	getParserFactory() Getter for the ParserFactory (Singleton)
void	read(Graph2D graph, InputStream in) Adds the contents from the given stream to the given graph.
protected void	read(Graph2D graph, Reader reader) Fills the contents of the given graph from a reader.
void	read(Graph2D graph, String name) Generates a FileReader and passes control to read(y.view.Graph2D, java.io.Reader)
static void	setEncoderFactory(EncoderFactory _encoderFactory) Setter for the EncoderFactory (Singleton)
static void	setParserFactory(ParserFactory _parserFactory) Setter for the ParserFactory (Singleton)
void	write(Graph2D graph, OutputStream out) Writes the contents of the given graph in GML format to a stream.

Methods inherited from class y.io.IOHandler

canRead, canWrite, canWriteSubset, createObjectInputStream, createObjectOutputStream, hide, read, shouldSerialize, shouldSerialize, write, writeSubset, writeSubset

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GMLIOHandler

public GMLIOHandler()

Instantiates a new GMLIOHandler.

Method Detail

getFileFormatString

public String getFileFormatString()

Returns the GML file format string.

Specified by:

getFileFormatString in class IOHandler

Returns:

the string

getFileNameExtension

public String getFileNameExtension()

Returns the GML file name extension, i.e. "gml".

Specified by:

getFileNameExtension in class IOHandler

Returns:

"gml"

read

public void read(Graph2D graph,
                 InputStream in)
          throws IOException

Adds the contents from the given stream to the given graph.

Specified by:

read in class IOHandler

Throws:

IOException

Parameters:

in - The input stream being read from

read

public void read(Graph2D graph,
                 String name)
          throws IOException

Generates a FileReader and passes control to read(y.view.Graph2D, java.io.Reader)

Overrides:

read in class IOHandler

Throws:

IOException - in the case of an I/O error

Parameters:

graph - the graph

name - the filename

read

protected void read(Graph2D graph,
                    Reader reader)
             throws IOException

Fills the contents of the given graph from a reader.

Throws:

IOException - in case of an I/O Exception

Parameters:

graph - the graph to be filled

reader - The reader being read from

getParserFactory

public static ParserFactory getParserFactory()

Getter for the ParserFactory (Singleton)

Returns:

a previously installed factory or DefaultParserFactory

setParserFactory

public static void setParserFactory(ParserFactory _parserFactory)

Setter for the ParserFactory (Singleton)

Parameters:

_parserFactory - the factory to be installed

getEncoderFactory

public static EncoderFactory getEncoderFactory()

Getter for the ParserFactory (Singleton)

Returns:

the previously installed factory or HierarchicGraphEncoderFactory

setEncoderFactory

public static void setEncoderFactory(EncoderFactory _encoderFactory)

Setter for the EncoderFactory (Singleton)

Parameters:

_encoderFactory - the factory to be installed

write

public void write(Graph2D graph,
                  OutputStream out)
           throws IOException

Writes the contents of the given graph in GML format to a stream. This is achieved by using the currently installed EncoderFactory, obtaining a ObjectEncoder for GML and invoking the ObjectEncoder.encode(Object, y.io.gml.GMLEncoder) method with the graph as the first argument.

Specified by:

write in class IOHandler

Throws:

IOException - in case of an I/O Exception

Parameters:

graph - the graph to be written

out - The OutputStream being written to.

convertColor

public static String convertColor(Color col)

Converts a java Color into standard string representation.

Parameters:

col - the color

Returns:

a String in the (GML) form #RRGGBB or #RRGGBBAA where each of the pairs is an hex value between 00 and FF.

decodeColor

public static Color decodeColor(String colorString)

Decodes a color string produced by convertColor(Color).

Parameters:

colorString - the color string

Returns:

an opaque color if the color string is of the form #RRGGBB and a transparent color if the input string is of the form #RRGGBBAA, where AA denotes the alpha component of the color.