1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/samples/composition/src-api2.0-runtime/api/Arithmetica.java	Sat Jun 14 09:58:13 2008 +0200
     1.3 @@ -0,0 +1,64 @@
     1.4 +package api;
     1.5 +
     1.6 +import org.apidesign.runtime.check.RuntimeCheck;
     1.7 +
     1.8 +/** Class to simplify arithmetical operations, improved version to compute
     1.9 + * the sum for ranges, but only if the virtual machine is configured to
    1.10 + * run in incompatible mode.
    1.11 + *
    1.12 + * @author Jaroslav Tulach <jtulach@netbeans.org>
    1.13 + * @version 2.0
    1.14 + */
    1.15 +public class Arithmetica {
    1.16 +    public int sumTwo(int one, int second) {
    1.17 +        return one + second;
    1.18 +    }
    1.19 +    
    1.20 +    public int sumAll(int... numbers) {
    1.21 +        int sum = numbers[0];
    1.22 +        for (int i = 1; i < numbers.length; i++) {
    1.23 +            sum = sumTwo(sum, numbers[i]);
    1.24 +        }
    1.25 +        return sum;
    1.26 +    }
    1.27 +    
    1.28 +    public int sumRange(int from, int to) {
    1.29 +        if (calledByV2AwareLoader()) {
    1.30 +            return sumRange2(from, to);
    1.31 +        } else {
    1.32 +            return sumRange1(from, to);
    1.33 +        }
    1.34 +    }
    1.35 +
    1.36 +    private int sumRange1(int from, int to) {
    1.37 +        int len = to - from;
    1.38 +        int[] array = new int[len + 1];
    1.39 +        for (int i = 0; i <= len; i++) {
    1.40 +            array[i] = from + i;
    1.41 +        }
    1.42 +        return sumAll(array);
    1.43 +    }
    1.44 +    
    1.45 +    private int sumRange2(int from, int to) {
    1.46 +        return (from + to) * (to - from + 1) / 2;
    1.47 +    }
    1.48 +
    1.49 +    private static boolean calledByV2AwareLoader() {
    1.50 +        // BEGIN: design.composition.arith2.6.runtime
    1.51 +        StackTraceElement[] arr = Thread.currentThread().getStackTrace();
    1.52 +        ClassLoader myLoader = Arithmetica.class.getClassLoader();
    1.53 +        for (int i = 0; i < arr.length; i++) {
    1.54 +            ClassLoader caller = arr[i].getClass().getClassLoader();
    1.55 +            if (myLoader == caller) {
    1.56 +                continue;
    1.57 +            }
    1.58 +            if (RuntimeCheck.requiresAtLeast("2.6", "api.Arithmetica", caller)) {
    1.59 +                return true;
    1.60 +            }
    1.61 +            return false;
    1.62 +        }
    1.63 +        return true;
    1.64 +        // END: design.composition.arith2.6.runtime
    1.65 +    }
    1.66 +    
    1.67 +}