/
ArrayUtils.java
75 lines (71 loc) · 2.54 KB
/
ArrayUtils.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
package org.jumpmind.symmetric.core.common;
import java.lang.reflect.Array;
public abstract class ArrayUtils {
/**
* <p>
* Adds all the elements of the given arrays into a new array.
* </p>
* <p>
* The new array contains all of the element of <code>array1</code> followed
* by all of the elements <code>array2</code>. When an array is returned, it
* is always a new array.
* </p>
*
* <pre>
* ArrayUtils.addAll(null, null) = null
* ArrayUtils.addAll(array1, null) = cloned copy of array1
* ArrayUtils.addAll(null, array2) = cloned copy of array2
* ArrayUtils.addAll([], []) = []
* ArrayUtils.addAll([null], [null]) = [null, null]
* ArrayUtils.addAll(["a", "b", "c"], ["1", "2", "3"]) = ["a", "b", "c", "1", "2", "3"]
* </pre>
*
* @param array1
* the first array whose elements are added to the new array, may
* be <code>null</code>
* @param array2
* the second array whose elements are added to the new array,
* may be <code>null</code>
* @return The new array, <code>null</code> if <code>null</code> array
* inputs. The type of the new array is the type of the first array.
* @since 2.1
*/
public static Object[] addAll(Object[] array1, Object[] array2) {
if (array1 == null) {
return clone(array2);
} else if (array2 == null) {
return clone(array1);
}
Object[] joinedArray = (Object[]) Array.newInstance(array1.getClass().getComponentType(),
array1.length + array2.length);
System.arraycopy(array1, 0, joinedArray, 0, array1.length);
System.arraycopy(array2, 0, joinedArray, array1.length, array2.length);
return joinedArray;
}
/**
* <p>
* Shallow clones an array returning a typecast result and handling
* <code>null</code>.
* </p>
*
* <p>
* The objects in the array are not cloned, thus there is no special
* handling for multi-dimensional arrays.
* </p>
*
* <p>
* This method returns <code>null</code> for a <code>null</code> input
* array.
* </p>
*
* @param array
* the array to shallow clone, may be <code>null</code>
* @return the cloned array, <code>null</code> if <code>null</code> input
*/
public static Object[] clone(Object[] array) {
if (array == null) {
return null;
}
return (Object[]) array.clone();
}
}