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1 /*
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2 Copyright (c) 2008 Franklin Schmidt <fschmidt@gmail.com>
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3
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4 Permission is hereby granted, free of charge, to any person obtaining a copy
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5 of this software and associated documentation files (the "Software"), to deal
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6 in the Software without restriction, including without limitation the rights
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7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 copies of the Software, and to permit persons to whom the Software is
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9 furnished to do so, subject to the following conditions:
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10
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11 The above copyright notice and this permission notice shall be included in
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12 all copies or substantial portions of the Software.
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13
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14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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20 THE SOFTWARE.
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21 */
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22
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23 package fschmidt.util.java;
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24
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25
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26 public final class ArrayUtils {
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27 private ArrayUtils() {} // never
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28
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29 public static void swap( Object[] a, int i, int j ) {
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30 Object t = a[i];
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31 a[i] = a[j];
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32 a[j] = t;
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33 }
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34
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35 public static void reverse( Object[] a ) {
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36 for( int i=0, j=a.length-1; i<j; i++, j-- ) {
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37 swap(a,i,j);
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38 }
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39 }
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40
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41 public static String unique(String[] a) {
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42 return (String)unique((Object[])a);
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43 }
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44
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45 public static Object unique(Object[] a) {
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46 if( a==null )
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47 return null;
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48 if( a.length > 1 )
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49 throw new IllegalArgumentException("array not unique");
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50 return a.length==0 ? null : a[0];
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51 }
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52 }
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