Examples of de.fuberlin.wiwiss.d2rq.expr.Constant

de.fuberlin.wiwiss.d2rq.expr.Constant
A constant-valued expression. This class currently doesn't track its type (Is the constant a number or string, for example?). Since we need to know the type when writing the constant to SQL, we keep a reference to an attribute around. The constant is assumed to have the same type as that attribute. This is an ugly hack. TODO Should have a {@link DataType} instead of the silly column reference @author Richard Cyganiak (richard@cyganiak.de)


  // FIXME: This doesn't take column functions other than IDENTITY into account
  // The usesColumnFunctions() method is here to allow detection of this case. 
  public Expression toExpression() {
    List<Expression> parts = new ArrayList<Expression>(literalParts.size() * 2 + 1);
    parts.add(new Constant(firstLiteralPart));
    for (int i = 0; i < columns.size(); i++) {
      parts.add(new AttributeExpr(columns.get(i)));
      parts.add(new Constant(literalParts.get(i)));
    }
    return Concatenation.create(parts);
  }

View Full Code Here

    for (String attributeName: expectedValues.keySet()) {
      String attributeValue = (String) expectedValues.get(attributeName);
      Attribute attribute = SQL.parseAttribute(attributeName);
      expressions.add(Equality.create(
          new AttributeExpr(attribute), 
          new Constant(attributeValue, attribute)));
    }
    Expression expr = Conjunction.create(expressions);
    assertEquals(expr, pattern.valueExpression(value));
  }

View Full Code Here

    return result.toString();
  }
  
  public Expression toExpression() {
    List<Expression> parts = new ArrayList<Expression>();
    parts.add(new Constant(classMapID));
    for (Attribute attribute: attributes) {
      parts.add(new Constant(DELIMITER));
      parts.add(new AttributeExpr(attribute));
    }
    return Concatenation.create(parts);
  }

View Full Code Here

TOP

Related Classes of de.fuberlin.wiwiss.d2rq.expr.Constant

de.fuberlin.wiwiss.d2rq.values.BlankNodeID

de.fuberlin.wiwiss.d2rq.values.Pattern

de.fuberlin.wiwiss.d2rq.values.PatternTest

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.