protected override Expression VisitBinary(BinaryExpression b)
{
if (b.NodeType == ExpressionType.Coalesce)
{
sb.Append("IsNull(");
Visit(b.Left);
sb.Append(",");
Visit(b.Right);
sb.Append(")");
}
else if (b.NodeType == ExpressionType.Equal || b.NodeType == ExpressionType.NotEqual)
{
if (b.Left is ConstantExpression)
{
if (b.Right is ConstantExpression)
throw new NotSupportedException("NULL == NULL not supported");
Field field = GetField(b.Right);
sb.Append(Equals(field, ((ConstantExpression)b.Left).Value, b.NodeType == ExpressionType.Equal));
}
else if (b.Right is ConstantExpression)
{
Field field = GetField(b.Left);
sb.Append(Equals(field, ((ConstantExpression)b.Right).Value, b.NodeType == ExpressionType.Equal));
}
else
throw new NotSupportedException("Impossible to translate {0}".Formato(b.NiceToString()));
}
else
{
sb.Append("(");
this.Visit(b.Left);
switch (b.NodeType)
{
case ExpressionType.And:
case ExpressionType.AndAlso:
sb.Append(b.Type.UnNullify() == typeof(bool) ? " AND " : " & ");
break;
case ExpressionType.Or:
case ExpressionType.OrElse:
sb.Append(b.Type.UnNullify() == typeof(bool) ? " OR " : " | ");
break;
case ExpressionType.ExclusiveOr:
sb.Append(" ^ ");
break;
case ExpressionType.LessThan:
sb.Append(" < ");
break;
case ExpressionType.LessThanOrEqual:
sb.Append(" <= ");
break;
case ExpressionType.GreaterThan:
sb.Append(" > ");
break;
case ExpressionType.GreaterThanOrEqual:
sb.Append(" >= ");
break;
case ExpressionType.Add:
case ExpressionType.AddChecked:
sb.Append(" + ");
break;
case ExpressionType.Subtract:
case ExpressionType.SubtractChecked:
sb.Append(" - ");
break;
case ExpressionType.Multiply:
case ExpressionType.MultiplyChecked:
sb.Append(" * ");
break;
case ExpressionType.Divide:
sb.Append(" / ");
break;
case ExpressionType.Modulo:
sb.Append(" % ");
break;
default:
throw new NotSupportedException(string.Format("The binary operator {0} is not supported", b.NodeType));
}
this.Visit(b.Right);
sb.Append(")");
}
return b;
}
