Java Array Range Copy copyOf(Object src, int newLength)

Description

copy Of

License

Open Source License

Declaration

public static Object copyOf(Object src, int newLength) 

Method Source Code

//package com.java2s;
/**!/*from  ww  w.j  av  a 2 s .  c  o  m*/
 * @author Daniel Friesen
 * @copyright Copyright ? 2009 Daniel Friesen
 * @license MIT License
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

public class Main {
    public static Object copyOf(Object src, int newLength) {
        Object copy = newArray(src, newLength);
        transfer(src, 0, copy, 0, Math.min(length(src), newLength));
        return copy;
    }

    /**
     * Return a new array of the same type as the one passed
     */
    public static Object newArray(Object src, int len) {
        if (src.getClass() == byte[].class)
            return new byte[len];
        if (src.getClass() == char[].class)
            return new char[len];
        throw illegal();
    }

    public static void transfer(Object src, int srcPos, Object dest, int destPos, int length) {
        if (src.getClass() != byte[].class & src.getClass() != char[].class)
            throw illegal();
        System.arraycopy(src, srcPos, dest, destPos, length);
    }

    public static int length(Object src) {
        if (src.getClass() == byte[].class)
            return ((byte[]) src).length;
        if (src.getClass() == char[].class)
            return ((char[]) src).length;
        throw illegal();
    }

    private static IllegalArgumentException illegal() {
        return new IllegalArgumentException("Only char[] and byte[] arrays are handled by ArrayUtils");
    }
}

Related

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2. copyOf(int[] source, int length)
3. copyOf(int[] src, int size)
4. copyOf(int[][] pixels)
5. copyOf(Integer[] original)
6. copyOf(Object[] array, int newLength)
7. copyOf(Object[] values, int nlen)
8. copyOf(String[] data, int newLength)
9. copyOf(String[] original, int newLength)