Agree, neither Property* nor Property& tracks references.
On 1/11/07, Pete Robbins <[EMAIL PROTECTED]> wrote:
Maybe the best solution would be to return a PropertyPtr (we do not like
returning raw pointers to our internal data so this is better than
Property*
... avoids lifetime of the Pointee problems):
PropertyPtr x = myType->getProperty("ID");
if (x)
{
x->what_ever_it_is_you_want_to_do_with_the_property??
}
On 11/01/07, Pete Robbins <[EMAIL PROTECTED]> wrote:
> The reason getProperty throws an exception is that it's a exceptional
> condition ;-)
> The expectation is that you KNOW the names of the properties on the SDO
> that you are dealing with. If not, then you would use getPropertyList or
> getInstanceProperties and iterate over the list.
>
> I'm assuming in your case that ALL your DO's are expected to have a
> particular property (ID)??. In which case isn't it an error if they
don't =
> exception?
>
>
>
> On 11/01/07, Adriano Crestani <[EMAIL PROTECTED]> wrote:
> >
> > I think it wouldn't be a good idea, because if you want to check if
> > there is
> > a property with the specified name using hasProperty method and later
to
> > get
> > the property with getProperty(string) it would look for the property
> > name
> > twice in the property list, for example:
> >
> > if (hasProperty("ID")) { // look on the list here
> > const Property& t = getProperty("ID"); // and here
> > }
> >
> > The best way should be:
> >
> > int propertyIndex = getPropertyIndex("ID");
> >
> > if (propertyIndex != -1) { // if it hasn't been found
> > const Property& t = getProperty(propertyIndex); // and here to get
the
> >
> > Property directly
> > }
> >
> > However, if the method getPropertyIndex(string) doesn't find any
> > property
> > with the specified name it also throws a SDOPropertyNotFoundException.
I
> > think we could purpose not a bool
> > Type::hasProperty(std::string propertyName) method, but a int
> > Type::getPropertyIndex(string) that returns a -1 value if the property
> > name
> > is not found, instead of an exception.
> >
> > Another question, where do I find the sdo spec?
> >
> > Adriano Crestani
>
>
> http://osoa.org/display/Main/Service+Data+Objects+Specifications
>
> On 1/11/07, Pete Robbins <[EMAIL PROTECTED] > wrote:
> > >
> > > On 11/01/07, Adriano Crestani < [EMAIL PROTECTED]> wrote:
> > > >
> > > > Thanks Pete, I thought there would be an easier way to do this.
But
> > if
> > > you
> > > > say so, I think it's the only way. Thanks again!
> > >
> > >
> > > That is what is in the spec. Maybe we could propose a bool
> > > Type::hasProperty(std::string propertyName); method
> > >
> > > Cheers,
> > >
> > > Adriano Crestani
> > > >
> > > > On 1/10/07, Pete Robbins <[EMAIL PROTECTED]> wrote:
> > > > >
> > > > > On 10/01/07, Adriano Crestani < [EMAIL PROTECTED]>
wrote:
> > > > > >
> > > > > > I'm begginer with C++ and I have one doubt about the function
> > > defined
> > > > in
> > > > > > Type.h: "virtual SDO_API const Property& getProperty(const
char*
> > > > > > propertyName) const = 0". It's supposed to return a reference
> > to a
> > > > > > Property
> > > > > > object that has the name equal to the parameter propertyName,
> > but if
> > > > > there
> > > > > > is no Property object with this name? What does this function
> > > return?
> > > > >
> > > > >
> > > > > It would through a SDOPropertyNotFoundException.
> > > > >
> > > > > I tried to do this...
> > > > > >
> > > > > > if (type.getProperty ("ID") == NULL)
> > > > > >
> > > > > > ...but as long as far as I know it's not possible. Is there a
> > way to
> > >
> > > > > check
> > > > > > if the function has found Property object with the specified
> > name or
> > > > > not.
> > > > > >
> > > > > > Adriano Crestani
> > > > >
> > > > >
> > > > >
> > > > > There is no easy way to do this. You would need to wrap the
> > > getProperty
> > > > in
> > > > > a
> > > > > try/catch block.
> > > > >
> > > > > Cheers,
> > > > >
> > > > > --
> > > > > Pete
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> > > --
> > > Pete
> > >
> > >
> >
> >
>
>
> --
> Pete
--
Pete
--
Yang ZHONG
