Home » openjdk-7 » javax.imageio.plugins » jpeg » [javadoc | source]

javax.imageio.plugins.jpeg
public class: JPEGHuffmanTable [javadoc | source]

java.lang.Object
   javax.imageio.plugins.jpeg.JPEGHuffmanTable

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

Field Summary
public static final  JPEGHuffmanTable	StdDCLuminance	The standard DC luminance Huffman table.
public static final  JPEGHuffmanTable	StdDCChrominance	The standard DC chrominance Huffman table.
public static final  JPEGHuffmanTable	StdACLuminance	The standard AC luminance Huffman table.
public static final  JPEGHuffmanTable	StdACChrominance	The standard AC chrominance Huffman table.

Constructor:

public JPEGHuffmanTable(short[] lengths, short[] values) { if (lengths == null || values == null || lengths.length == 0 || values.length == 0 || lengths.length > 16 || values.length > 256) { throw new IllegalArgumentException("Illegal lengths or values"); } for (int i = 0; i< lengths.length; i++) { if (lengths[i] < 0) { throw new IllegalArgumentException("lengths["+i+"] < 0"); } } for (int i = 0; i< values.length; i++) { if (values[i] < 0) { throw new IllegalArgumentException("values["+i+"] < 0"); } } this.lengths = Arrays.copyOf(lengths, lengths.length); this.values = Arrays.copyOf(values, values.length); validate(); } 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 {@code short}s where lengths[k] is equal to the number of values with corresponding codes of length k + 1 bits. values - an array of shorts containing the values in order of increasing code length. Throws: IllegalArgumentException - if lengths or values are null, the length of lengths is greater than 16, the length of values is greater than 256, if any value in lengths or values is less than zero, or if the arrays do not describe a valid Huffman table.

Method from javax.imageio.plugins.jpeg.JPEGHuffmanTable Summary:
getLengths,   getValues,   toString

Methods from java.lang.Object:
clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait

Method from javax.imageio.plugins.jpeg.JPEGHuffmanTable Detail:
public short[] getLengths() { return Arrays.copyOf(lengths, lengths.length); } Returns an array of shorts containing the number of values for each length in the Huffman table. The returned array is a copy.
public short[] getValues() { return Arrays.copyOf(values, values.length); } Returns an array of shorts containing the values arranged by increasing length of their corresponding codes. The interpretation of the array is dependent on the values returned from getLengths. The returned array is a copy.
public String toString() { String ls = System.getProperty("line.separator", "\n"); StringBuilder sb = new StringBuilder("JPEGHuffmanTable"); sb.append(ls).append("lengths:"); for (int i=0; i< lengths.length; i++) { sb.append(" ").append(lengths[i]); } sb.append(ls).append("values:"); for (int i=0; i< values.length; i++) { sb.append(" ").append(values[i]); } return sb.toString(); } Returns a {@code String} representing this Huffman table.