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package android.security;
import libcore.util.EmptyArray;
/**
* @hide
*/
abstract class ArrayUtils {
private ArrayUtils() {}
public static String[] nullToEmpty(String[] array) {
return (array != null) ? array : EmptyArray.STRING;
}
public static String[] cloneIfNotEmpty(String[] array) {
return ((array != null) && (array.length > 0)) ? array.clone() : array;
}
public static byte[] concat(byte[] arr1, byte[] arr2) {
return concat(arr1, 0, (arr1 != null) ? arr1.length : 0,
arr2, 0, (arr2 != null) ? arr2.length : 0);
}
public static byte[] concat(byte[] arr1, int offset1, int len1, byte[] arr2, int offset2,
int len2) {
if (len1 == 0) {
return subarray(arr2, offset2, len2);
} else if (len2 == 0) {
return subarray(arr1, offset1, len1);
} else {
byte[] result = new byte[len1 + len2];
System.arraycopy(arr1, offset1, result, 0, len1);
System.arraycopy(arr2, offset2, result, len1, len2);
return result;
}
}
public static byte[] subarray(byte[] arr, int offset, int len) {
if (len == 0) {
return EmptyArray.BYTE;
}
if ((offset == 0) && (len == arr.length)) {
return arr;
}
byte[] result = new byte[len];
System.arraycopy(arr, offset, result, 0, len);
return result;
}
public static int[] concat(int[] arr1, int[] arr2) {
if ((arr1 == null) || (arr1.length == 0)) {
return arr2;
} else if ((arr2 == null) || (arr2.length == 0)) {
return arr1;
} else {
int[] result = new int[arr1.length + arr2.length];
System.arraycopy(arr1, 0, result, 0, arr1.length);
System.arraycopy(arr2, 0, result, arr1.length, arr2.length);
return result;
}
}
}
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