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edu.wisc.cs.stego.lib
Class RadixKEncoder

java.lang.Object
  |
  +--edu.wisc.cs.stego.Encoder
        |
        +--edu.wisc.cs.stego.lib.RadixKEncoder
public class RadixKEncoder
extends Encoder

Implements an Encoder object that outputs the data in a radix-k graph. The value for k is specified as a parameter to the factory method or can be taken as the default value. For more information on radix-k graphs, see:


Currently, this class allows the use of k between 2 and 36. If this value is not specified in the job file, it defaults to 10. In the graph, the least significant digit is represented first.

See Also:
Encoder, edu.wisc.cs.stego.JobFile

Field Summary
static int DEFAULT_RADIX
          The default radix for the RadixK objects.
static java.lang.String PARAM_ID
          The name of the e-arg parameter in the job file which specifies a radix.
 
Constructor Summary
protected RadixKEncoder(java.lang.String[] argv)
          Builds a new RadixK encoder.
 
Method Summary
static Encoder buildEncoder(java.lang.String[] argv)
          This factory method builds RadixK objects.
 WatermarkGraph encodeWMData(java.lang.String data)
          Computes a radix-k graph which encodes the specified data.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

DEFAULT_RADIX

public static final int DEFAULT_RADIX
The default radix for the RadixK objects.

PARAM_ID

public static final java.lang.String PARAM_ID
The name of the e-arg parameter in the job file which specifies a radix.
See Also:
edu.wisc.cs.stego.JobFile
Constructor Detail

RadixKEncoder

protected RadixKEncoder(java.lang.String[] argv)
Builds a new RadixK encoder. The argv array may optionally contain a single element of the form: radix=n where n is a positive integer. If more than one argument is specified, this constructor only considers the first.
Throws:
java.lang.IllegalArgumentException - if the first argument in the argv array is invalid.
See Also:
edu.wisc.cs.stego.JobFile
Method Detail

buildEncoder

public static Encoder buildEncoder(java.lang.String[] argv)
This factory method builds RadixK objects. The argv array may optionally contain a single element of the form: radix=n where n is a positive integer. If more than one argument is specified, this constructor only considers the first.
Parameters:
argv - arguments to the encoder specified in the job file.
Returns:
a newly instantiated RadixK object.
Throws:
java.lang.IllegalArgumentException - if the first argument in the argv array is invalid.

encodeWMData

public WatermarkGraph encodeWMData(java.lang.String data)
Computes a radix-k graph which encodes the specified data. The radix is specified by the arguments to the factory method for this class. If none are specified, the default is used.
Overrides:
encodeWMData in class Encoder
Parameters:
data - the message text to be encoded.
Returns:
the adjacency matrix for the watermark graph.
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