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Java Platform 1.2
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Class com.sun.image.codec.jpeg.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 - - thrown if the length of the tables is greater that the allowed table lengths. Or if the described huffman table is invalid.

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