Examples of de.fuberlin.wiwiss.d2rq.values.ValueMaker

de.fuberlin.wiwiss.d2rq.values.ValueMaker
Describes a set of strings that are obtained in some way from one or more database columns.
Typical implementations are {@link Attribute} (describing the setof strings contained in one database column), {@link Pattern}(describing the set of strings that is obtained by sticking the values of several database fields into a string pattern), and {@link BlankNodeID} (similar).
There are several other ValueSources that modify the behaviour of another underlying ValueSource, implementing the Decorator pattern. This includes {@link TranslationTable}.TranslatingValueSource (translates values using a translation table or translation class) and the various value restrictions (@link RegexRestriction et. al.).
ValueSources are used by NodeMakers. A node maker wraps the strings into Jena nodes, thus creating a description of a set of RDF nodes. @author Richard Cyganiak (richard@cyganiak.de)

      logger.debug("isEqual(" + variable + ", " + constant + ")");
      
      NodeMaker nm = variable.getNodeMaker();
      
      if (nm instanceof TypedNodeMaker) {
        ValueMaker vm = ((TypedNodeMaker) nm).valueMaker();
        Node node = constant.getNode();
        logger.debug("checking " + node + " with " + nm);
        
        if (XSD.isNumeric(node)) {
          DetermineNodeType filter = new DetermineNodeType();
          nm.describeSelf(filter);
          RDFDatatype datatype = filter.getDatatype();
          if (datatype != null && XSD.isNumeric(datatype)) {
            RDFDatatype numericType = XSD.getNumericType(datatype, node.getLiteralDatatype());
            nm = cast(nm, numericType);
            node = XSD.cast(node, numericType);
          }
        }
        
        boolean empty = nm.selectNode(node, RelationalOperators.DUMMY).equals(NodeMaker.EMPTY);
        logger.debug("result " + new Boolean(empty));
        if (!empty) {
          if (node.isURI())
            expression.push(vm.valueExpression(node.getURI()));
          else if (node.isLiteral()) {
            if (XSD.isSupported(node.getLiteralDatatype()))
              expression.push(vm.valueExpression(constant.value()));
            else 
              conversionFailed("cannot compare values of type " + node.getLiteralDatatypeURI(), expr);
          } else
            conversionFailed(expr); // TODO blank nodes?
          return;

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      logger.debug("isNotEqual(" + variable + ", " + constant + ")");
      
      NodeMaker nm = variable.getNodeMaker();
      
      if (nm instanceof TypedNodeMaker) {
        ValueMaker vm = ((TypedNodeMaker) nm).valueMaker();
        Node node = constant.getNode();
        logger.debug("checking " + node + " with " + nm);
        if (XSD.isNumeric(node)) {
          DetermineNodeType filter = new DetermineNodeType();
          nm.describeSelf(filter);
          RDFDatatype datatype = filter.getDatatype();
          if (datatype != null && XSD.isNumeric(datatype)) {
            RDFDatatype numericType = XSD.getNumericType(datatype, node.getLiteralDatatype());
            nm = cast(nm, numericType);
            node = XSD.cast(node, numericType);
          }
        }
        boolean empty = nm.selectNode(node, RelationalOperators.DUMMY).equals(NodeMaker.EMPTY);
        logger.debug("result " + new Boolean(empty));
        if (!empty) {
          if (node.isURI())
            expression.push(new Negation(vm.valueExpression(node.getURI())));
          else if (node.isLiteral()) {
            if (XSD.isSupported(node.getLiteralDatatype()))
              expression.push(new Negation(vm.valueExpression(constant.value())));
            else // type = boolean or an unknown type
              conversionFailed("cannot compare values of type " + node.getLiteralDatatypeURI(), expr);
          } else
            conversionFailed(expr); // TODO blank nodes?
          return;

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      logger.debug("isEqual(" + variable + ", " + constant + ")");
      
      NodeMaker nm = variable.getNodeMaker();
      
      if (nm instanceof TypedNodeMaker) {
        ValueMaker vm = ((TypedNodeMaker) nm).valueMaker();
        Node node = constant.getNode();
        logger.debug("checking " + node + " with " + nm);
                
        boolean empty = nm.selectNode(node, RelationalOperators.DUMMY).equals(NodeMaker.EMPTY);
        logger.debug("result " + new Boolean(empty));
        if (!empty) {
          if (node.isURI())
            expression.push(vm.valueExpression(node.getURI()));
          else if (node.isLiteral())
            expression.push(vm.valueExpression(constant.value()));
          else
            conversionFailed(expr); // TODO blank nodes?
          return;
        } else {
          expression.push(Expression.FALSE);

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    }
    return this.refersToClassMap.buildAliasedNodeMaker(new AliasMap(aliases()), !this.containsDuplicates);
  }


  public NodeMaker buildAliasedNodeMaker(AliasMap aliases, boolean unique) {
    ValueMaker values = wrapValueSource(buildValueSourceBase()).renameAttributes(aliases);
    return buildNodeMaker(values, unique);
  }

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Related Classes of de.fuberlin.wiwiss.d2rq.values.ValueMaker

de.fuberlin.wiwiss.d2rq.map.ResourceMap

de.fuberlin.wiwiss.d2rq.optimizer.expr.TransformExprToSQLApplyer

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