Example usage for org.apache.commons.lang3 ArrayUtils reverse

Introduction

In this page you can find the example usage for org.apache.commons.lang3 ArrayUtils reverse.

Prototype

public static void reverse(final short[] array, final int startIndexInclusive, final int endIndexExclusive) 

Source Link

Document

Reverses the order of the given array in the given range.

Usage

From source file:com.github.jonmarsh.waveform_processing_for_imagej.WaveformUtils.java

/**
 * Rotates portion of input array in specified range in place by specified
 * number of points. {@code n>0} corresponds to shift to the right,
 * {@code n<0} corresponds to shift to the left. No error checking is
 * performed on range limits; if the values are negative or outside the
 * range of the array, a runtime exception may be thrown. No action is
 * performed if {@code a} is {@code null} or zero-length, if
 * {@code to-from<=0}, or if {@code abs(n)<0}.
 *
 * @param a      input array/*from ww  w.  j  a  v  a  2s. c  om*/
 * @param n    number of places to shift
 * @param from initial index of the range in which to rotate elements,
 *             inclusive
 * @param to   final index of the range in which to rotate elements,
 *             exclusive
 */
public static final void rotateArrayInPlace(double[] a, int n, int from, int to) {
    int absN = Math.abs(n);
    int size = to - from;

    if (a != null && size > 0 && absN > 0 && a.length > 0) {

        if (absN > size) {
            absN = absN % size;
        }

        if (n > 0) {
            ArrayUtils.reverse(a, from, from + size);
        }

        ArrayUtils.reverse(a, from, from + absN);
        ArrayUtils.reverse(a, from + absN, from + size);

        if (n < 0) {
            ArrayUtils.reverse(a, from, from + size);
        }
    }
}

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From source file:com.github.jonmarsh.waveform_processing_for_imagej.WaveformUtils.java

/**
 * Rotates portion of input array in specified range in place by specified
 * number of points.{@code n>0} corresponds to shift to the right,
 * {@code n<0} corresponds to shift to the left. No error checking is
 * performed on range limits; if the values are negative or outside the
 * range of the array, a runtime exception may be thrown. No action is
 * performed if {@code a} is {@code null} or zero-length, if
 * {@code to-from<=0}, or if {@code abs(n)<0}.
 *
 * @param a      input array//from  ww w.j  av  a  2 s.  c o m
 * @param n      number of places to shift
 * @param from initial index of the range in which to rotate elements,
 *             inclusive
 * @param to   final index of the range in which to rotate elements,
 *             exclusive
 */
public static final void rotateArrayInPlace(float[] a, int n, int from, int to) {
    int absN = Math.abs(n);
    int size = to - from;

    if (a != null && size > 0 && absN > 0 && a.length > 0) {

        if (absN > size) {
            absN = absN % size;
        }

        if (n > 0) {
            ArrayUtils.reverse(a, from, from + size);
        }

        ArrayUtils.reverse(a, from, from + absN);
        ArrayUtils.reverse(a, from + absN, from + size);

        if (n < 0) {
            ArrayUtils.reverse(a, from, from + size);
        }
    }
}

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