- java.lang.Object
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- javax.imageio.plugins.jpeg.JPEGHuffmanTable
 
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 public class JPEGHuffmanTable extends Object A class encapsulating a single JPEG Huffman table. Fields are provided for the "standard" tables taken from Annex K of the JPEG specification. These are the tables used as defaults.For more information about the operation of the standard JPEG plug-in, see the JPEG metadata format specification and usage notes 
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Field SummaryFields Modifier and Type Field Description static JPEGHuffmanTableStdACChrominanceThe standard AC chrominance Huffman table.static JPEGHuffmanTableStdACLuminanceThe standard AC luminance Huffman table.static JPEGHuffmanTableStdDCChrominanceThe standard DC chrominance Huffman table.static JPEGHuffmanTableStdDCLuminanceThe standard DC luminance Huffman table.
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Constructor SummaryConstructors Constructor Description JPEGHuffmanTable(short[] lengths, short[] values)Creates a Huffman table and initializes it.
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Method SummaryAll Methods Instance Methods Concrete Methods Modifier and Type Method Description short[]getLengths()Returns an array ofshorts containing the number of values for each length in the Huffman table.short[]getValues()Returns an array ofshorts containing the values arranged by increasing length of their corresponding codes.StringtoString()Returns aStringrepresenting this Huffman table.
 
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Field Detail- 
StdDCLuminancepublic static final JPEGHuffmanTable StdDCLuminance The standard DC luminance Huffman table.
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StdDCChrominancepublic static final JPEGHuffmanTable StdDCChrominance The standard DC chrominance Huffman table.
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StdACLuminancepublic static final JPEGHuffmanTable StdACLuminance The standard AC luminance Huffman table.
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StdACChrominancepublic static final JPEGHuffmanTable StdACChrominance The standard AC chrominance Huffman table.
 
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Constructor Detail- 
JPEGHuffmanTablepublic JPEGHuffmanTable(short[] lengths, short[] values)Creates a Huffman table and initializes it. The input arrays are copied. The arrays must describe a possible Huffman table. For example, 3 codes cannot be expressed with a single bit.- Parameters:
- lengths- an array of- shorts where- lengths[k]is equal to the number of values with corresponding codes of length- k + 1bits.
- values- an array of shorts containing the values in order of increasing code length.
- Throws:
- IllegalArgumentException- if- lengthsor- valuesare null, the length of- lengthsis greater than 16, the length of- valuesis greater than 256, if any value in- lengthsor- valuesis less than zero, or if the arrays do not describe a valid Huffman table.
 
 
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Method Detail- 
getLengthspublic short[] getLengths() Returns an array ofshorts containing the number of values for each length in the Huffman table. The returned array is a copy.- Returns:
- a shortarray wherearray[k-1]is equal to the number of values in the table of lengthk.
- See Also:
- getValues()
 
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getValuespublic short[] getValues() Returns an array ofshorts containing the values arranged by increasing length of their corresponding codes. The interpretation of the array is dependent on the values returned fromgetLengths. The returned array is a copy.- Returns:
- a shortarray of values.
- See Also:
- getLengths()
 
 
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