public Bound max(Bound aBound) {
if (equals(MAX)) {
return this;
}
if (aBound.equals(MAX)) {
return aBound;
}
if (this.value.max(aBound.getValue()).equals(this.value)) {
return this;
} else {
return aBound;
}
}
public Bound subtract(Bound bound) {
if (bound == null) {
throw new InternalError("value shouldn't be null");
}
if (equals(MAX) && bound.equals(MAX) || equals(MIN) && bound.equals(MIN)) {
throw new InternalError("Canno't subtract + infinite and - infinite");
}
if (bound.equals(MAX) || equals(MIN)) {
return MIN;
} else if (bound.equals(MIN) || equals(MAX)) {
return MAX;
} else {
return new Bound(this.value.subtract(bound.getValue()));
}
}