3 import org.apidesign.runtime.check.RuntimeCheck;
5 /** Class to simplify arithmetical operations, improved version to compute
6 * the sum for ranges, but only if the virtual machine is configured to
7 * run in incompatible mode.
9 * @author Jaroslav Tulach <jtulach@netbeans.org>
12 public class Arithmetica {
13 public int sumTwo(int one, int second) {
17 public int sumAll(int... numbers) {
19 for (int i = 1; i < numbers.length; i++) {
20 sum = sumTwo(sum, numbers[i]);
25 public int sumRange(int from, int to) {
26 if (calledByV2AwareLoader()) {
27 return sumRange2(from, to);
29 return sumRange1(from, to);
33 private int sumRange1(int from, int to) {
35 int[] array = new int[len + 1];
36 for (int i = 0; i <= len; i++) {
42 private int sumRange2(int from, int to) {
43 return (from + to) * (to - from + 1) / 2;
46 private static boolean calledByV2AwareLoader() {
47 // BEGIN: design.composition.arith2.6.runtime
48 StackTraceElement[] arr = Thread.currentThread().getStackTrace();
49 ClassLoader myLoader = Arithmetica.class.getClassLoader();
50 for (int i = 0; i < arr.length; i++) {
51 ClassLoader caller = arr[i].getClass().getClassLoader();
52 if (myLoader == caller) {
55 if (RuntimeCheck.requiresAtLeast("2.6", "api.Arithmetica", caller)) {
61 // END: design.composition.arith2.6.runtime