1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/samples/composition/src-api2.0-property/org/apidesign/math/Arithmetica.java Sat Feb 14 17:30:06 2009 +0100
1.3 @@ -0,0 +1,54 @@
1.4 +package org.apidesign.math;
1.5 +
1.6 +/** Class to simplify arithmetical operations, improved version to compute
1.7 + * the sum for ranges, but only if the virtual machine is configured to
1.8 + * run in incompatible mode.
1.9 + *
1.10 + * @author Jaroslav Tulach <jtulach@netbeans.org>
1.11 + * @version 2.0
1.12 + */
1.13 +// BEGIN: design.composition.arith2.0.property
1.14 +public class Arithmetica {
1.15 + public int sumTwo(int one, int second) {
1.16 + return one + second;
1.17 + }
1.18 +
1.19 + public int sumAll(int... numbers) {
1.20 + if (numbers.length == 0) {
1.21 + return 0;
1.22 + }
1.23 + int sum = numbers[0];
1.24 + for (int i = 1; i < numbers.length; i++) {
1.25 + sum = sumTwo(sum, numbers[i]);
1.26 + }
1.27 + return sum;
1.28 + }
1.29 +
1.30 + public int sumRange(int from, int to) {
1.31 + // BEGIN: design.composition.arith2.0.property.if
1.32 + if (Boolean.getBoolean("arithmetica.v2")) {
1.33 + return sumRange2(from, to);
1.34 + } else {
1.35 + return sumRange1(from, to);
1.36 + }
1.37 + // END: design.composition.arith2.0.property.if
1.38 + }
1.39 +
1.40 + private int sumRange1(int from, int to) {
1.41 + int len = to - from;
1.42 + if (len < 0) {
1.43 + len = -len;
1.44 + from = to;
1.45 + }
1.46 + int[] array = new int[len + 1];
1.47 + for (int i = 0; i <= len; i++) {
1.48 + array[i] = from + i;
1.49 + }
1.50 + return sumAll(array);
1.51 + }
1.52 +
1.53 + private int sumRange2(int from, int to) {
1.54 + return (from + to) * (Math.abs(to - from) + 1) / 2;
1.55 + }
1.56 +}
1.57 +// END: design.composition.arith2.0.property