1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/task4/solution11/src/org/apidesign/apifest08/currency/DateUtil.java	Fri Oct 17 17:34:40 2008 +0200
     1.3 @@ -0,0 +1,68 @@
     1.4 +package org.apidesign.apifest08.currency;
     1.5 +
     1.6 +import java.util.Date;
     1.7 +
     1.8 +/**
     1.9 + * Date util helper class.
    1.10 + * @author ked
    1.11 + */
    1.12 +final class DateUtil {
    1.13 +
    1.14 +    private DateUtil() {};
    1.15 +
    1.16 +    static boolean isInRange(Date instant, Date from, Date till) {
    1.17 +        if ((from == null || instant.equals(from) || instant.after(from)) &&
    1.18 +                (till == null || instant.before(till))) {
    1.19 +            return true;
    1.20 +        } else {
    1.21 +            return false;
    1.22 +        }
    1.23 +    }
    1.24 +
    1.25 +    static boolean isRangesOverlapping(Date fromA, Date tillA, Date fromB, Date tillB) {
    1.26 +        if ((fromA == null && tillA == null) || (fromB == null && tillB == null)) {
    1.27 +            return true;
    1.28 +        }
    1.29 +        if (fromA != null && isInRange(fromA, fromB, tillB)) {
    1.30 +            return true;
    1.31 +        }
    1.32 +        if (tillA != null && !tillA.equals(fromB) && isInRange(tillA, fromB, tillB)) {
    1.33 +            return true;
    1.34 +        }
    1.35 +        if (fromB != null && isInRange(fromB, fromA, tillA)) {
    1.36 +            return true;
    1.37 +        }
    1.38 +        if (tillB != null && !tillB.equals(fromA) && isInRange(tillB, fromA, tillA)) {
    1.39 +            return true;
    1.40 +        }
    1.41 +        return false;
    1.42 +    }
    1.43 +
    1.44 +    static Date getRangesIntersectionBottom(Date fromA, Date fromB) {
    1.45 +        if (fromA == null) {
    1.46 +            return fromB;
    1.47 +        }
    1.48 +        if (fromB == null) {
    1.49 +            return fromA;
    1.50 +        }
    1.51 +        if (fromA.after(fromB)) {
    1.52 +            return fromA;
    1.53 +        } else {
    1.54 +            return fromB;
    1.55 +        }
    1.56 +    }
    1.57 +
    1.58 +    static Date getRangesIntersectionTop(Date tillA, Date tillB) {
    1.59 +        if (tillA == null) {
    1.60 +            return tillB;
    1.61 +        }
    1.62 +        if (tillB == null) {
    1.63 +            return tillA;
    1.64 +        }
    1.65 +        if (tillA.before(tillB)) {
    1.66 +            return tillA;
    1.67 +        } else {
    1.68 +            return tillB;
    1.69 +        }
    1.70 +    }
    1.71 +}