Java Var.getValue方法代碼示例

import org.eclipse.rdf4j.query.algebra.Var; //導入方法依賴的package包/類
/**
 * Evaluate {@link ZeroLengthPath} query model nodes
 * @param parent
 * @param zlp
 * @param bindings
 */
private void evaluateZeroLengthPath(BindingSetPipe parent, ZeroLengthPath zlp, BindingSet bindings) {
    final Var subjectVar = zlp.getSubjectVar();
    final Var objVar = zlp.getObjectVar();
    final Var contextVar = zlp.getContextVar();
    Value subj = subjectVar.getValue() == null ? bindings.getValue(subjectVar.getName()) : subjectVar.getValue();
    Value obj = objVar.getValue() == null ? bindings.getValue(objVar.getName()) : objVar.getValue();
    if (subj != null && obj != null) {
        if (!subj.equals(obj)) {
            try {
                parent.push(null);
            } catch (InterruptedException e) {
                parent.handleException(e);
            }
            return;
        }
    }
    //temporary solution using copy of the original iterator
    //re-writing this to push model is a bit more complex task
    HalyardStatementPatternEvaluation.enqueue(parent, new ZeroLengthPathIteration(parentStrategy, subjectVar, objVar, subj, obj, contextVar, bindings), zlp);
}
 

import org.eclipse.rdf4j.query.algebra.Var; //導入方法依賴的package包/類
private Collection<FuzzyEntry<Var>> transformVar(Var v) {
    Set<FuzzyEntry<Var>> vars = new HashSet<FuzzyEntry<Var>>();

    Value val = v.getValue();
    if (val != null && val instanceof IRI) {
        Collection<EquivalentIRI> uris =  getEquivalentURI(v);
        for(EquivalentIRI uri : uris)
        {
            Var v1 = transformVar(v,uri);
            vars.add(new FuzzyEntry<Var>(v1, uri.getProximity()));
        }
    }
    else {
        vars.add(new FuzzyEntry<Var>(v));
    }
    return vars;
}
 

import org.eclipse.rdf4j.query.algebra.Var; //導入方法依賴的package包/類
protected static Value toValue(Var var, BindingSet bindings) {
	if (var.hasValue())
		return var.getValue();
	
	if (bindings.hasBinding(var.getName()))	
		return bindings.getValue(var.getName());
	
	return null;			
}
 

import org.eclipse.rdf4j.query.algebra.Var; //導入方法依賴的package包/類
/**
 * Gets a value from a {@code Var} if it has a {@code Value}. If it does not then the method will attempt to get it 
 * from the bindings using the name of the Var
 * @param var
 * @param bindings
 * @return the matching {@code Value} or {@code null} if var is {@code null}
 */
private static Value getVarValue(Var var, BindingSet bindings) {
    if (var == null) {
        return null;
    } else if (var.hasValue()) {
        return var.getValue();
    } else {
        return bindings.getValue(var.getName());
    }
}
 

import org.eclipse.rdf4j.query.algebra.Var; //導入方法依賴的package包/類
/**
 * Evaluate a {@link Var} query model node. 
 * @param var
 * @param bindings the set of named value bindings
 * @return the result of {@link Var#getValue()} from either {@code var}, or if {@code null}, from the {@ bindings}
 * @throws ValueExprEvaluationException
 * @throws QueryEvaluationException
 */
private Value evaluate(Var var, BindingSet bindings) throws ValueExprEvaluationException, QueryEvaluationException {
    Value value = var.getValue();
    if (value == null) {
        value = bindings.getValue(var.getName());
    }
    if (value == null) {
        throw new ValueExprEvaluationException();
    }
    return value;
}
 

import org.eclipse.rdf4j.query.algebra.Var; //導入方法依賴的package包/類
private boolean isSameCtx(Var v1, Var v2) {
    if ((v1 != null && v1.getValue() != null) && (v2 != null && v2.getValue() != null)) {
        return v1.getValue().equals(v2.getValue());
    }
    else if ((v1 != null && v1.getName() != null) && (v2 != null && v2.getName() != null)) {
        return v1.getName().equals(v2.getName());
    }

    return false;
}
 

import org.eclipse.rdf4j.query.algebra.Var; //導入方法依賴的package包/類
private Collection<EquivalentIRI> getEquivalentURI(Var v) {
    Value val = v.getValue();

    if (val != null && val instanceof IRI) {
        IRI uri = (IRI)val;
        return queryTransformation.retrieveEquivalentURIs(uri);
    }

    return Collections.emptySet();
}
 

import org.eclipse.rdf4j.query.algebra.Var; //導入方法依賴的package包/類
@Override
public void meet(Var var) {
	if (var.getValue()==null)
		vars.add(var.getName());
	super.meet(var);
}
 

import org.eclipse.rdf4j.query.algebra.Var; //導入方法依賴的package包/類
/**
 * Return the {@link Value} of the variable which is either taken from
 * the variable itself (bound) or from the bindingsset (unbound).
 * 
 * @param var
 * @param bindings
 * 			the bindings, must not be null, use {@link EmptyBindingSet} instead
 * 
 * @return
 * 		the value or null
 */
public static Value getVarValue(Var var, BindingSet bindings) {
	if (var == null) {
		return null;
	} else if (var.hasValue()) {
		return var.getValue();
	} else {
		return bindings.getValue(var.getName());
	}
}