com.sun.image.codec.jpeg
Class JPEGHuffmanTable

java.lang.Object
  |
  +--com.sun.image.codec.jpeg.JPEGHuffmanTable

public class JPEGHuffmanTable

extends Object

A class to encapsulate a JPEG Huffman table.

Note that the classes in the com.sun.image.codec.jpeg package are not part of the core Java APIs. They are a part of Sun's JDK and JRE distributions. Although other licensees may choose to distribute these classes, developers cannot depend on their availability in non-Sun implementations. We expect that equivalent functionality will eventually be available in a core API or standard extension.

Field Summary

static JPEGHuffmanTable	StdACChrominance Standard Huffman table ( JPEG standard section K.3 )
static JPEGHuffmanTable	StdACLuminance Standard Huffman table ( JPEG standard section K.3 )
static JPEGHuffmanTable	StdDCChrominance Standard Huffman table ( JPEG standard section K.3 )
static JPEGHuffmanTable	StdDCLuminance Standard Huffman table ( JPEG standard section K.3 )

Constructor Summary

JPEGHuffmanTable(short[] lengths, short[] symbols)
Creates a Huffman Table and initializes it.

Method Summary

short[]	getLengths() Return a copy of the array containing the number of symbols for each length in the Huffman table.
short[]	getSymbols() Return an array containing the Huffman symbols arranged by increasing length.

Methods inherited from class java.lang.Object

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

Field Detail

StdDCLuminance

public static final JPEGHuffmanTable StdDCLuminance

Standard Huffman table ( JPEG standard section K.3 )

StdDCChrominance

public static final JPEGHuffmanTable StdDCChrominance

Standard Huffman table ( JPEG standard section K.3 )

StdACLuminance

public static final JPEGHuffmanTable StdACLuminance

Standard Huffman table ( JPEG standard section K.3 )

StdACChrominance

public static final JPEGHuffmanTable StdACChrominance

Standard Huffman table ( JPEG standard section K.3 )

Constructor Detail

JPEGHuffmanTable

public JPEGHuffmanTable(short[] lengths,
                        short[] symbols)

Creates a Huffman Table and initializes it.

Parameters:

lengths - lengths[k] = # of symbols with codes of length k bits; lengths[0] is ignored

symbols - symbols in order of increasing code length

Throws:

IllegalArgumentException - if the length of lengths is greater than 17

IllegalArgumentException - if the length of symbols is greater than 256

IllegalArgumentException - if any of the values in lengths or symbols is less than zero

Method Detail

getLengths

public short[] getLengths()

Return a copy of the array containing the number of symbols for each length in the Huffman table.

Returns:

A short array where array[k] = # of symbols in the table of length k. array[0] is unused

getSymbols

public short[] getSymbols()

Return an array containing the Huffman symbols arranged by increasing length. To make use of this array you must refer the the lengths array.

Returns:

A short array of Huffman symbols