public Period intersection(Period p2, int granularity) throws TemporalException {
Period result;
if (startInstant.equals(p2.getStartInstant(), granularity)) { // They must intersect
if (finishInstant.after(p2.getFinishInstant(), granularity)) {
result = new Period(temporal, startInstant, p2.getFinishInstant(), granularity);
} else {
result = new Period(temporal, startInstant, finishInstant, granularity);
} // if
} else if (startInstant.before(
p2.getStartInstant(), granularity)) { // p2 starts after this Period
if (finishInstant.after(p2.getStartInstant(), granularity)) { // They intersect
if (finishInstant.before(p2.getFinishInstant(), granularity)) {
result = new Period(temporal, p2.getStartInstant(), finishInstant, granularity);
} else {
result = new Period(temporal, p2.getStartInstant(), p2.getFinishInstant(), granularity);
} // if
} else {
result = null;
} // if
} else { // p2 start before this Period
if (p2.getFinishInstant().after(startInstant, granularity)) { // They intersect
if (finishInstant.before(p2.getFinishInstant(), granularity)) {
result = new Period(temporal, startInstant, finishInstant, granularity);
} else {
result = new Period(temporal, startInstant, p2.getFinishInstant(), granularity);
} // if
} else {
result = null;
} // if
} // if
return result;
} // intersection
private void orderCheck() throws TemporalException {
if (startInstant.after(finishInstant, Temporal.FINEST))
throw new TemporalException(
"start must be before or equal to finish in a period: ("
+ startInstant.toString(Temporal.FINEST)
+ ", "
+ finishInstant.toString(Temporal.FINEST)
+ ")");
} // orderCheck
