Examples with IteratorException fr.lirmm.graphik.util.stream.IteratorException used on opensource projects

Example 11 with IteratorException

use of fr.lirmm.graphik.util.stream.IteratorException in project graal by graphik-team.

the class SccChase method next.

// /////////////////////////////////////////////////////////////////////////
// PUBLIC METHODS
// /////////////////////////////////////////////////////////////////////////
@Override
public void next() throws ChaseException {
    ++this.level;
    tmpAtom = new LinkedList<Atom>();
    for (Integer scc : layers[level]) {
        Set<Rule> component = this.sccg.getComponent(scc);
        GraphOfRuleDependencies subGraph = this.grd.getSubGraph(component);
        if (component.size() == 1 && !subGraph.hasCircuit()) {
            try {
                CloseableIterator<Atom> it = this.getRuleApplier().delegatedApply(component.iterator().next(), atomSet);
                while (it.hasNext()) {
                    tmpAtom.add(it.next());
                }
                it.close();
            } catch (RuleApplicationException e) {
                throw new ChaseException("", e);
            } catch (IteratorException e) {
                throw new ChaseException("", e);
            }
        } else {
            Chase chase = new ChaseWithGRD<T>(subGraph, atomSet, this.getRuleApplier());
            chase.execute();
        }
    }
    try {
        atomSet.addAll(new CloseableIteratorAdapter<Atom>(tmpAtom.iterator()));
    } catch (AtomSetException e) {
        throw new ChaseException("", e);
    }
}

Example 12 with IteratorException

use of fr.lirmm.graphik.util.stream.IteratorException in project graal by graphik-team.

the class FrontierRestrictedChaseHaltingCondition method apply.

@Override
public CloseableIterator<Atom> apply(Rule rule, Substitution substitution, AtomSet data) throws HomomorphismFactoryException, HomomorphismException {
    Set<Term> fixedVars = substitution.getValues();
    if (ruleIndex.get(rule) == null) {
        ruleIndex.put(rule, _currentRuleIndex++);
    }
    final int index = ruleIndex.get(rule).intValue();
    StringBuilder frontierSb = new StringBuilder();
    SortedSet<Variable> frontierSet = new TreeSet<Variable>(rule.getFrontier());
    for (Term t : frontierSet) {
        frontierSb.append("_");
        frontierSb.append(t.getLabel());
        frontierSb.append(substitution.createImageOf(t).getLabel());
    }
    String frontier = frontierSb.toString();
    for (Variable t : rule.getExistentials()) {
        substitution.put(t, DefaultTermFactory.instance().createConstant("f_" + index + "_" + t.getIdentifier() + frontier));
    }
    InMemoryAtomSet newFacts = substitution.createImageOf(rule.getHead());
    ConjunctiveQuery query = new ConjunctiveQueryWithFixedVariables(newFacts, fixedVars);
    if (LOGGER.isDebugEnabled()) {
        LOGGER.debug("Fixed Query:" + query);
    }
    try {
        if (SmartHomomorphism.instance().execute(query, data).hasNext()) {
            return new CloseableIteratorAdapter<Atom>(Collections.<Atom>emptyList().iterator());
        }
    } catch (IteratorException e) {
        throw new HomomorphismException("An errors occurs while iterating results", e);
    }
    return newFacts.iterator();
}

Example 13 with IteratorException

use of fr.lirmm.graphik.util.stream.IteratorException in project graal by graphik-team.

the class DefaultUCQHomomorphism method exist.

@Override
public boolean exist(UnionOfConjunctiveQueries q, AtomSet a) throws HomomorphismException {
    try {
        CloseableIterator<Substitution> execute = this.execute(q, a);
        boolean res = execute.hasNext();
        execute.close();
        return res;
    } catch (IteratorException e) {
        throw new HomomorphismException(e);
    }
}

Example 14 with IteratorException

use of fr.lirmm.graphik.util.stream.IteratorException in project graal by graphik-team.

the class RuleApplierIterator method hasNext.

@Override
public boolean hasNext() throws IteratorException {
    if (!this.hasNextCallDone) {
        this.hasNextCallDone = true;
        if (this.localIt != null && !this.localIt.hasNext()) {
            this.localIt.close();
            this.localIt = null;
        }
        while ((this.localIt == null || !this.localIt.hasNext()) && this.substitutionIt.hasNext()) {
            try {
                localIt = haltingCondition.apply(rule, substitutionIt.next(), atomset);
            } catch (HomomorphismFactoryException e) {
                throw new IteratorException("Error during rule application", e);
            } catch (HomomorphismException e) {
                throw new IteratorException("Error during rule application", e);
            }
        }
    }
    return this.localIt != null && this.localIt.hasNext();
}

Example 15 with IteratorException

use of fr.lirmm.graphik.util.stream.IteratorException in project graal by graphik-team.

the class UnionConjunctiveQueriesSubstitutionIterator method hasNext.

@Override
public boolean hasNext() throws IteratorException {
    if (!this.hasNextCallDone) {
        this.hasNextCallDone = true;
        if (this.tmpIt != null && !this.tmpIt.hasNext()) {
            this.tmpIt.close();
            this.tmpIt = null;
            this.getProfiler().stop("SubQuery" + i++);
        }
        while ((this.tmpIt == null || !this.tmpIt.hasNext()) && this.cqueryIterator.hasNext()) {
            ConjunctiveQuery q = this.cqueryIterator.next();
            this.getProfiler().start("SubQuery" + i);
            try {
                if (this.homomorphism == null) {
                    this.tmpIt = SmartHomomorphism.instance().execute(q, this.atomSet, this.compilation);
                } else {
                    if (this.compilation != null && !(this.compilation instanceof NoCompilation)) {
                        if (this.homomorphism instanceof HomomorphismWithCompilation) {
                            this.tmpIt = ((HomomorphismWithCompilation<ConjunctiveQuery, AtomSet>) this.homomorphism).execute(q, this.atomSet, this.compilation);
                        } else {
                            throw new IteratorException("There is a compilation and selected homomorphism can't handle it : " + this.homomorphism.getClass());
                        }
                    } else {
                        this.tmpIt = this.homomorphism.execute(q, this.atomSet);
                    }
                }
                if (this.isBooleanQuery && this.tmpIt.hasNext()) {
                    this.cqueryIterator.close();
                }
            } catch (HomomorphismException e) {
                return false;
            }
        }
    }
    return this.tmpIt != null && this.tmpIt.hasNext();
}