Java Matrix Swap swapShorts(byte bs[][])

Description

swap Shorts

License

LGPL

Declaration

public static byte[][] swapShorts(byte bs[][]) 

Method Source Code

//package com.java2s;
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1/*  w w  w . j  av  a  2 s.c  o  m*/
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * Agfa Healthcare.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * See @authors listed below
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

public class Main {
    public static byte[][] swapShorts(byte bs[][]) {
        int carry = 0;
        for (int i = 0; i < bs.length; i++) {
            byte[] b = bs[i];
            if (carry != 0)
                swapLastFirst(bs[i - 1], b);
            int len = b.length - carry;
            swapShorts(b, carry, len & ~1);
            carry = len & 1;
        }
        return bs;
    }

    public static byte[] swapShorts(byte b[], int off, int len) {
        checkLength(len, 2);
        for (int i = off, n = off + len; i < n; i += 2)
            swap(b, i, i + 1);
        return b;
    }

    private static void swapLastFirst(byte[] b1, byte[] b2) {
        int last = b1.length - 1;
        byte t = b2[0];
        b2[0] = b1[last];
        b1[last] = t;
    }

    private static void checkLength(int len, int numBytes) {
        if (len < 0 || (len % numBytes) != 0)
            throw new IllegalArgumentException("length: " + len);
    }

    private static void swap(byte[] bytes, int a, int b) {
        byte t = bytes[a];
        bytes[a] = bytes[b];
        bytes[b] = t;
    }
}

Related

1. swapColumns(double[][] front, int colA, int colB)
2. swapColumns(int i, int j, boolean[][] matrix)
3. swapRows(double[][] a, int i, int j)
4. swapRows(double[][] Ab, int k, int i)
5. swapRows(double[][] matrix, int i1, int i2)
6. swapTwoBlocks(int[][] pattern, int block1, int block2)
7. swapTwoRows(byte[][] pattern, int row1, int row2)