ArrayUtils.java Source code

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Here is the source code for ArrayUtils.java

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/*
 * Copyright (C) Jakub Neubauer, 2007
 *
 * This file is part of TaskBlocks
 *
 * TaskBlocks is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * TaskBlocks is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

//package taskblocks.utils;

import java.lang.reflect.Array;

/**
 * Set of utilities used to manipulate arrays.
 * 
 * @author j.neubauer
 * @since 11.1.2007
 */
public class ArrayUtils {

    /**
     * Creates new array of the same type as given array and adds specified member
     * to the end of new array.
     *  
     * @param array
     * @param member
     * @return new array with member appened
     */
    public static Object[] addToArray(Object[] array, Object member) {
        Object[] newArray = (Object[]) Array.newInstance(array.getClass().getComponentType(), array.length + 1);
        System.arraycopy(array, 0, newArray, 0, array.length);
        newArray[array.length] = member;
        return newArray;
    }

    /**
     * Finds member in array and if finds it, creates the same array without this member.
     * 
     * @param array
     * @param member
     * @return new array without member or the old array if member wasn't found
     */
    public static Object[] removeFromArray(Object[] array, Object member) {
        int i;
        for (i = 0; i < array.length; i++) {
            if (array[i] == member) {
                break;
            }
        }
        // if we found the listener, construct new arrray without it.
        if (i < array.length) {
            Object[] newArray = (Object[]) Array.newInstance(array.getClass().getComponentType(), array.length - 1);
            System.arraycopy(array, 0, newArray, 0, i);
            System.arraycopy(array, i + 1, newArray, i, array.length - i - 1);
            return newArray;
        }
        return array;
    }

    public static Object[] removeFromArray(Object[] array, int i) {
        if (i < 0 || i >= array.length) {
            throw new IndexOutOfBoundsException();
        }
        Object[] newArray = (Object[]) Array.newInstance(array.getClass().getComponentType(), array.length - 1);
        System.arraycopy(array, 0, newArray, 0, i);
        System.arraycopy(array, i + 1, newArray, i, array.length - i - 1);
        return newArray;
    }
}