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
public Period merge(Period p2, int granularity) throws TemporalException {
Instant resultStartInstant, resultFinishInstant;
Period result;
if ((intersection(p2, granularity) == null) && (!adjacent(p2, granularity)))
throw new TemporalException(
"start must be before or equal to the finish in a period: ('"
+ toString(granularity)
+ "'), ('"
+ p2.toString(granularity)
+ "')");
if (startInstant.before(p2.getStartInstant(), granularity)) resultStartInstant = startInstant;
else resultStartInstant = p2.getStartInstant();
if (getFinishInstant().before(p2.getFinishInstant(), granularity))
resultFinishInstant = p2.getFinishInstant();
else resultFinishInstant = finishInstant;
result = new Period(temporal, resultStartInstant, resultFinishInstant, granularity);
return result;
} // merge