Examples with StatementPattern org.eclipse.rdf4j.query.algebra.StatementPattern used on opensource projects

Example 6 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class BaseTupleExprRenderer method toStatementPattern.

/**
 * Turn a ProjectionElemList for a construct query projection (three elements aliased as 'subject',
 * 'predicate' and 'object' in that order) into a StatementPattern.
 *
 * @param theList
 *        the elem list to render
 * @return the elem list for a construct projection as a statement pattern
 * @throws Exception
 *         if there is an exception while rendering
 */
public StatementPattern toStatementPattern(ProjectionElemList theList) throws Exception {
    ProjectionElem aSubj = theList.getElements().get(0);
    ProjectionElem aPred = theList.getElements().get(1);
    ProjectionElem aObj = theList.getElements().get(2);
    return new StatementPattern(mExtensions.containsKey(aSubj.getSourceName()) ? new Var(scrubVarName(aSubj.getSourceName()), asValue(mExtensions.get(aSubj.getSourceName()))) : new Var(scrubVarName(aSubj.getSourceName())), mExtensions.containsKey(aPred.getSourceName()) ? new Var(scrubVarName(aPred.getSourceName()), asValue(mExtensions.get(aPred.getSourceName()))) : new Var(scrubVarName(aPred.getSourceName())), mExtensions.containsKey(aObj.getSourceName()) ? new Var(scrubVarName(aObj.getSourceName()), asValue(mExtensions.get(aObj.getSourceName()))) : new Var(scrubVarName(aObj.getSourceName())));
}

Example 7 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class ConstructorBuilder method getConstructVars.

/**
 * Gets the set of variables that are relevant for the constructor. This method accumulates all subject,
 * predicate and object variables from the supplied statement patterns, but ignores any context variables.
 */
private Set<Var> getConstructVars(Collection<StatementPattern> statementPatterns) {
    Set<Var> vars = new LinkedHashSet<Var>(statementPatterns.size() * 2);
    for (StatementPattern sp : statementPatterns) {
        vars.add(sp.getSubjectVar());
        vars.add(sp.getPredicateVar());
        vars.add(sp.getObjectVar());
    }
    return vars;
}

Example 8 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class AbstractQueryBuilder method multiProjection.

private UnaryTupleOperator multiProjection() {
    MultiProjection aProjection = new MultiProjection();
    Extension aExt = null;
    for (StatementPattern aPattern : mProjectionPatterns) {
        ProjectionElemList aList = new ProjectionElemList();
        aList.addElement(new ProjectionElem(aPattern.getSubjectVar().getName(), "subject"));
        aList.addElement(new ProjectionElem(aPattern.getPredicateVar().getName(), "predicate"));
        aList.addElement(new ProjectionElem(aPattern.getObjectVar().getName(), "object"));
        if (aPattern.getSubjectVar().hasValue()) {
            if (aExt == null) {
                aExt = new Extension();
            }
            aExt.addElements(new ExtensionElem(new ValueConstant(aPattern.getSubjectVar().getValue()), aPattern.getSubjectVar().getName()));
        }
        if (aPattern.getPredicateVar().hasValue()) {
            if (aExt == null) {
                aExt = new Extension();
            }
            aExt.addElements(new ExtensionElem(new ValueConstant(aPattern.getPredicateVar().getValue()), aPattern.getPredicateVar().getName()));
        }
        if (aPattern.getObjectVar().hasValue()) {
            if (aExt == null) {
                aExt = new Extension();
            }
            aExt.addElements(new ExtensionElem(new ValueConstant(aPattern.getObjectVar().getValue()), aPattern.getObjectVar().getName()));
        }
        aProjection.addProjection(aList);
    }
    if (aExt != null) {
        aProjection.setArg(aExt);
    }
    return aProjection;
}

Example 9 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class GroupBuilder method atoms.

public GroupBuilder<T, E> atoms(Set<StatementPattern> thePatterns) {
    for (StatementPattern aPattern : thePatterns) {
        aPattern.setContextVar(mContext);
        aPattern.setScope(mScope);
    }
    mGroup.addAll(thePatterns);
    return this;
}

Example 10 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class TupleExprBuilder method createTupleExprForNegatedPropertySet.

private TupleExpr createTupleExprForNegatedPropertySet(NegatedPropertySet nps, int index) {
    Var subjVar = nps.getSubjectVar();
    Var predVar = createAnonVar();
    ValueExpr filterCondition = null;
    ValueExpr filterConditionInverse = null;
    // build (inverted) filter conditions for each negated path element.
    for (PropertySetElem elem : nps.getPropertySetElems()) {
        ValueConstant predicate = elem.getPredicate();
        if (elem.isInverse()) {
            Compare compare = new Compare(predVar, predicate, CompareOp.NE);
            if (filterConditionInverse == null) {
                filterConditionInverse = compare;
            } else {
                filterConditionInverse = new And(compare, filterConditionInverse);
            }
        } else {
            Compare compare = new Compare(predVar, predicate, CompareOp.NE);
            if (filterCondition == null) {
                filterCondition = compare;
            } else {
                filterCondition = new And(compare, filterCondition);
            }
        }
    }
    TupleExpr patternMatch = null;
    // one item)
    if (filterCondition != null) {
        for (ValueExpr objVar : nps.getObjectList()) {
            if (patternMatch == null) {
                patternMatch = new StatementPattern(nps.getScope(), subjVar, predVar, (Var) objVar, nps.getContextVar());
            } else {
                patternMatch = new Join(new StatementPattern(nps.getScope(), subjVar, predVar, (Var) objVar, nps.getContextVar()), patternMatch);
            }
        }
    }
    TupleExpr patternMatchInverse = null;
    // one item):
    if (filterConditionInverse != null) {
        for (ValueExpr objVar : nps.getObjectList()) {
            if (patternMatchInverse == null) {
                patternMatchInverse = new StatementPattern(nps.getScope(), (Var) objVar, predVar, subjVar, nps.getContextVar());
            } else {
                patternMatchInverse = new Join(new StatementPattern(nps.getScope(), (Var) objVar, predVar, subjVar, nps.getContextVar()), patternMatchInverse);
            }
        }
    }
    TupleExpr completeMatch = null;
    if (patternMatch != null) {
        completeMatch = new Filter(patternMatch, filterCondition);
    }
    if (patternMatchInverse != null) {
        if (completeMatch == null) {
            completeMatch = new Filter(patternMatchInverse, filterConditionInverse);
        } else {
            completeMatch = new Union(new Filter(patternMatchInverse, filterConditionInverse), completeMatch);
        }
    }
    return completeMatch;
}