Examples of org.datanucleus.query.expression.DyadicExpression

Package org.datanucleus.query.expression

Examples of org.datanucleus.query.expression.DyadicExpression

org.datanucleus.query.expression.DyadicExpression
Expression between two other expressions and an operation. For example, "this.myField < myValue" will become left = PrimaryExpression, right = Literal, op = Expression.OP_LT. A special case is where we have an expression like "!(condition)". In this case we become left = expression, right = null, op = Expression.OP_NOT.


  private Object getValueFromDyadicExpression(Expression expr) {
    // In general we don't support nested dyadic expressions
    // but we special case negation:
    // select * from table where val = -33
    DyadicExpression dyadic = (DyadicExpression) expr;
    if (dyadic.getLeft() instanceof Literal &&
        ((Literal) dyadic.getLeft()).getLiteral() instanceof Number &&
        dyadic.getRight() == null &&
        Expression.OP_NEG.equals(dyadic.getOperator())) {
      Number negateMe = (Number) ((Literal) dyadic.getLeft()).getLiteral();
      return negateNumber(negateMe);
    }


    throw new UnsupportedDatastoreFeatureException(
        "Right side of expression is composed of unsupported components.  "
        + "Left: " + dyadic.getLeft().getClass().getName()
        + ", Op: " + dyadic.getOperator()
        + ", Right: " + dyadic.getRight());
  }

View Full Code Here


  private Object getValueFromDyadicExpression(Expression expr) {
    // In general we don't support nested dyadic expressions
    // but we special case negation:
    // select * from table where val = -33
    DyadicExpression dyadic = (DyadicExpression) expr;
    if (dyadic.getLeft() instanceof Literal &&
        ((Literal) dyadic.getLeft()).getLiteral() instanceof Number &&
        dyadic.getRight() == null &&
        Expression.OP_NEG.equals(dyadic.getOperator())) {
      Number negateMe = (Number) ((Literal) dyadic.getLeft()).getLiteral();
      return negateNumber(negateMe);
    }
    throw new UnsupportedDatastoreFeatureException(
        "Right side of expression is composed of unsupported components.  "
        + "Left: " + dyadic.getLeft().getClass().getName()
        + ", Op: " + dyadic.getOperator()
        + ", Right: " + dyadic.getRight());
  }

View Full Code Here


  private Object getValueFromDyadicExpression(Expression expr) {
    // In general we don't support nested dyadic expressions
    // but we special case negation:
    // select * from table where val = -33
    DyadicExpression dyadic = (DyadicExpression) expr;
    if (dyadic.getLeft() instanceof Literal &&
        ((Literal) dyadic.getLeft()).getLiteral() instanceof Number &&
        dyadic.getRight() == null &&
        Expression.OP_NEG.equals(dyadic.getOperator())) {
      Number negateMe = (Number) ((Literal) dyadic.getLeft()).getLiteral();
      return negateNumber(negateMe);
    }
    throw new UnsupportedDatastoreFeatureException(
        "Right side of expression is composed of unsupported components.  "
        + "Left: " + dyadic.getLeft().getClass().getName()
        + ", Op: " + dyadic.getOperator()
        + ", Right: " + dyadic.getRight());
  }

View Full Code Here

    protected Object processNegExpression(Expression expr)
    {
        Number val = null;
        if (expr instanceof DyadicExpression)
        {
            DyadicExpression dyExpr = (DyadicExpression)expr;
            if (dyExpr.getLeft() instanceof PrimaryExpression)
            {
                val = (Number)getValueForPrimaryExpression((PrimaryExpression)expr.getLeft());
            }
            else if (dyExpr.getLeft() instanceof ParameterExpression)
            {
                val = (Number)QueryUtils.getValueForParameterExpression(parameterValues, (ParameterExpression)expr.getLeft());
            }
            else
            {
                throw new NucleusException("No current support for negation of dyadic expression on type " + 
                    dyExpr.getLeft().getClass().getName());
            }
        }
        else if (expr instanceof Literal)
        {
            throw new NucleusException("No current support for negation of expression of type Literal");

View Full Code Here


  private Object getValueFromDyadicExpression(Expression expr) {
    // In general we don't support nested dyadic expressions
    // but we special case negation:
    // select * from table where val = -33
    DyadicExpression dyadic = (DyadicExpression) expr;
    if (dyadic.getLeft() instanceof Literal &&
        ((Literal) dyadic.getLeft()).getLiteral() instanceof Number &&
        dyadic.getRight() == null &&
        Expression.OP_NEG.equals(dyadic.getOperator())) {
      Number negateMe = (Number) ((Literal) dyadic.getLeft()).getLiteral();
      return negateNumber(negateMe);
    }
    throw new UnsupportedDatastoreFeatureException(
        "Right side of expression is composed of unsupported components.  "
        + "Left: " + dyadic.getLeft().getClass().getName()
        + ", Op: " + dyadic.getOperator()
        + ", Right: " + dyadic.getRight());
  }

View Full Code Here

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