@Override
public boolean isApplicable(TableauTree tree) {
if (tree.getConcepts() == null || tree.getConcepts().isEmpty()) {
tree.addAppliedRule(this.getClass());
return false;
}
if (tree.isRuleApplied(this.getClass())) {
return false;
}
return getExistencialTerm(tree) != null;
}
/**
* This rules creates splits the current tree in two different ones.
*
* @param tree
*/
@Override
public boolean apply(TableauTree tree) {
RoleTerm eTerm = getExistencialTerm(tree);
if (eTerm == null) {
return false; // nothing to apply. It should have been call but to avoid problems return the
// same tree
}
tree.getConcepts().remove(eTerm);
tree.addChildren(
eTerm.getRole(),
new TableauTree(new IndividualTerm("a" + tree.getTotalChildren(), true), eTerm.getTerm()));
return true;
}
/**
* @return
* @author jmayaalv
*/
private RoleTerm getExistencialTerm(TableauTree tree) {
RoleTerm rTerm = null;
for (Term term : tree.getConcepts()) {
if (term instanceof RoleTerm) {
RoleTerm roleTerm = (RoleTerm) term;
if (RoleTerm.RoleTermOperation.EXISTENTIAL_RESTRICTION.equals(roleTerm.getOperation())) {
rTerm = roleTerm;
break;
}
}
}
if (rTerm == null) {
tree.addAppliedRule(this.getClass());
}
return rTerm;
}