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package org.semanticweb.karma2.model.cqparser;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.antlr.runtime.tree.CommonTree;
import org.semanticweb.HermiT.model.Atom;
import org.semanticweb.HermiT.model.AtomicConcept;
import org.semanticweb.HermiT.model.AtomicRole;
import org.semanticweb.HermiT.model.Individual;
import org.semanticweb.HermiT.model.Term;
import org.semanticweb.HermiT.model.Variable;
import org.semanticweb.karma2.exception.IllegalInputQueryException;
import org.semanticweb.karma2.model.ConjunctiveQuery;
import uk.ac.ox.cs.JRDFox.Prefixes;
import uk.ac.ox.cs.pagoda.util.Utility;
public class ConjunctiveQueryWalker {
public ConjunctiveQueryWalker() {
}
@SuppressWarnings("unchecked")
private List<CommonTree> childrenOf(CommonTree node) {
return (List<CommonTree>) node.getChildren();
}
private boolean isSafe(Term[] headTerms, Atom[] atoms) {
for (Term t : headTerms) {
if (t instanceof Variable) {
boolean res = false;
for (Atom a : atoms) {
if (a.getArity()==1) {
if (a.getArgument(0).equals(t))
res = true;
}
if (a.getArity()==2) {
if (a.getArgument(0).equals(t) || a.getArgument(1).equals(t))
res = true;
}
}
if(!res)
return false;
}
}
return true;
}
public ConjunctiveQuery walkExpressionNode(CommonTree ruleNode) throws IllegalInputQueryException {
assert (ruleNode.getType() == ConjunctiveQueryLexer.EXPRESSION);
Iterator<CommonTree> iterator = childrenOf(ruleNode).iterator();
CommonTree prefixList = iterator.next();
assert (prefixList.getType() == ConjunctiveQueryLexer.PREFIX_LIST);
Prefixes prefixes = walkPrefixList(prefixList);
CommonTree rulebody = iterator.next();
assert (rulebody.getType() == ConjunctiveQueryLexer.RULE);
return walkRuleNode(rulebody, prefixes);
}
public Prefixes walkPrefixList(CommonTree prefixlist) throws IllegalInputQueryException {
assert (prefixlist.getType() == ConjunctiveQueryLexer.PREFIX_LIST);
Prefixes pref = new Prefixes();
for (CommonTree prefixNode : childrenOf(prefixlist)) {
walkPrefixNode(prefixNode, pref);
}
return pref;
}
private void walkPrefixNode(CommonTree prefixNode, Prefixes pref) throws IllegalInputQueryException {
Iterator<CommonTree> iterator = childrenOf(prefixNode).iterator();
CommonTree shortID = iterator.next();
CommonTree longID = iterator.next();
pref.declarePrefix(shortID.getText() + ":", longID.getText());
}
public ConjunctiveQuery walkRuleNode(CommonTree ruleNode, Prefixes prefixes) throws IllegalInputQueryException {
assert (ruleNode.getType() == ConjunctiveQueryLexer.RULE);
Iterator<CommonTree> iterator = childrenOf(ruleNode).iterator();
CommonTree headNode = iterator.next();
assert (headNode.getType() == ConjunctiveQueryLexer.HEADATOM);
Term[] headTerms = walkHeadAtomNode(headNode);
Atom[] atoms = walkAtomList(iterator.next());
if (!isSafe(headTerms, atoms))
throw new IllegalInputQueryException("query is not safe");
return new ConjunctiveQuery(atoms, headTerms, prefixes);
}
private Term[] walkHeadAtomNode(CommonTree node) throws IllegalInputQueryException {
List<Term> terms = new ArrayList<Term>();
for (CommonTree termNode : childrenOf(node)) {
terms.add(walkTermNode(termNode));
}
return terms.toArray(new Term[terms.size()]);
}
private String walkCompositeId(CommonTree compositeID) {
Iterator<CommonTree> iterator = childrenOf(compositeID).iterator();
return iterator.next().getText() + ":" + iterator.next().getText() ;
}
private String walkSimpleId(CommonTree termNode) {
Iterator<CommonTree> it = childrenOf(termNode).iterator();
it.next();
CommonTree t = it.next();
return t.getText();
}
private Term walkTermNode(CommonTree termNode) throws IllegalInputQueryException {
if (termNode.getType() == ConjunctiveQueryLexer.VARIABLE) {
return Variable.create("?" + childrenOf(termNode).iterator().next().getText());
}
if (termNode.getType() == ConjunctiveQueryLexer.CONSTANT) {
Individual newind = Individual.create(walkCompositeId(childrenOf(termNode).iterator().next()));
Utility.logError(newind);
return newind;
}
if (termNode.getType() == ConjunctiveQueryLexer.SCONSTANT) {
Individual newind = Individual.create(walkSimpleId(termNode));
return newind;
}
throw new IllegalArgumentException();
}
public Atom[] walkAtomList(CommonTree node) throws IllegalInputQueryException {
assert (node.getType() == ConjunctiveQueryLexer.ATOM_LIST);
List<Atom> atoms = new ArrayList<Atom>();
for (CommonTree atomNode : childrenOf(node)) {
atoms.add(walkAtomNode(atomNode));
}
return atoms.toArray(new Atom[atoms.size()]);
}
private Atom walkAtomNode(CommonTree atomNode) throws IllegalInputQueryException {
assert (atomNode.getType() == ConjunctiveQueryLexer.ATOM);
Iterator<CommonTree> iterator = childrenOf(atomNode).iterator();
CommonTree id = iterator.next();
String predicatename = walkCompositeId(id);
List<Term> listofterms = new ArrayList<Term>();
while (iterator.hasNext()){
listofterms.add(walkTermNode(iterator.next()));
}
if(listofterms.isEmpty() || (listofterms.size()>2))
throw new IllegalInputQueryException("Problem parsing terms in the query");
Term[] terms = listofterms.toArray(new Term[listofterms.size()]);
if (terms.length == 1)
return Atom.create(AtomicConcept.create(predicatename), terms);
if (terms.length == 2)
return Atom.create(AtomicRole.create(predicatename), terms);
throw new IllegalInputQueryException("Problem parsing terms in the query");
}
}
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