Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.lang.reflect.Array;

public class Main {
    /**
     * Returns an array containing the elements of parameter source, with one
     * element removed or added. Parameter adjust {-1, +1} indicates the
     * operation. Parameter colindex indicates the position at which an element
     * is removed or added. Parameter addition is an Object to add when
     * adjust is +1.
     */
    public static Object toAdjustedArray(Object source, Object addition, int colindex, int adjust) {

        int newsize = Array.getLength(source) + adjust;
        Object newarray = Array.newInstance(source.getClass().getComponentType(), newsize);

        copyAdjustArray(source, newarray, addition, colindex, adjust);

        return newarray;
    }

    /**
     *  Copies elements of source to dest. If adjust is -1 the element at
     *  colindex is not copied. If adjust is +1 that element is filled with
     *  the Object addition. All the rest of the elements in source are
     *  shifted left or right accordingly when they are copied. If adjust is 0
     *  the addition is copied over the element at colindex.
     *
     *  No checks are perfomed on array sizes and an exception is thrown
     *  if they are not consistent with the other arguments.
     */
    public static void copyAdjustArray(Object source, Object dest, Object addition, int colindex, int adjust) {

        int length = Array.getLength(source);

        if (colindex < 0) {
            System.arraycopy(source, 0, dest, 0, length);

            return;
        }

        System.arraycopy(source, 0, dest, 0, colindex);

        if (adjust == 0) {
            int endcount = length - colindex - 1;

            Array.set(dest, colindex, addition);

            if (endcount > 0) {
                System.arraycopy(source, colindex + 1, dest, colindex + 1, endcount);
            }
        } else if (adjust < 0) {
            int endcount = length - colindex - 1;

            if (endcount > 0) {
                System.arraycopy(source, colindex + 1, dest, colindex, endcount);
            }
        } else {
            int endcount = length - colindex;

            Array.set(dest, colindex, addition);

            if (endcount > 0) {
                System.arraycopy(source, colindex, dest, colindex + 1, endcount);
            }
        }
    }
}