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From Scott Koenig <scott.l.koe...@gmail.com>
Subject Re: using a custom Converter for elements of a Collection
Date Thu, 13 Jan 2011 16:20:34 GMT
I was able to find a solution by creating a second converter,
PlaylistsConverter, which returns a List of Playlists instead:

public Object convertFromString(Map arg0, String[] arg1, Class arg2) {
        if (arg1.length > 0 && arg1[0].trim() != "") {
            List<Playlist> playlists = new ArrayList<Playlist>();
            try {
                for (int i = 0; i < arg1.length; i++) {
                    if (arg1[i] != null && !arg1[i].trim().equals("")) {
                        playlists.add((Playlist)
repositoryAppService.retrieveContentById(Long.valueOf(arg1[i])));
                    }
                }
                return playlists;
            } catch (Exception e) {
                throw new TypeConversionException(e);
            }
        } else {
            return null;
        }
    }

This serves my purposes, but I would still prefer to reuse
PlaylistConverter, which is used by Playlists themselves to handle what we
call source Playlists:

@Override
public Object convertFromString(Map arg0, String[] arg1, Class arg2) {
        if (arg1.length > 0 && arg1[0].trim() != "") {
            List<Playlist> playlists = new ArrayList<Playlist>();
            try {
                for (int i = 0; i < arg1.length; i++) {
                    if (arg1[i] != null && !arg1[i].trim().equals("")) {
                        playlists.add((Playlist)
repositoryAppService.retrieveContentById(Long.valueOf(arg1[i])));
                    }
                }
                return playlists;
            } catch (Exception e) {
                throw new TypeConversionException(e);
            }
        } else {
            return null;
        }
    }

I'm happy to provide additional code, but I don't want to inundate you with
chaff... can you give me some idea of the wheat you are looking for?

Thanks,
~~Scott

On Wed, Jan 12, 2011 at 7:08 PM, <stanlick@gmail.com> wrote:

> Can we see your related files?
>
> On Wed, Jan 12, 2011 at 3:43 PM, Scott Koenig <scott.l.koenig@gmail.com
> >wrote:
>
> > Hello,
> >
> > In my company's internal CMS, we are implementing two new asset types,
> > Videos and Playlists (collections of Videos). In the Video UI, the user
> > designates which Playlists are to be associated with a given Video, and
> > these values are posted on save via an array called "playlists" which
> > contains the UIDs of each Playlist. These are represented as an
> > ArrayList<Playlist> in the Video POJO.
> >
> > We have implemented a PlaylistConverter to convert each String UID to a
> > Playlist instance (and back), and going off of
> >
> >
> http://struts.apache.org/2.1.8/docs/type-conversion.html#TypeConversion-CollectionandMapSupport
> > ,
> > added Element_playlists=[converterpackage].PlaylistConverter to
> > Video-conversion.properties.
> >
> > Save was not committing and there seemed to be some conversion error, so
> I
> > stepped through the conversion process to try and determine what was
> going
> > wrong. Everything seems to be fine at the Collection level; it properly
> > determines that the toType of the collection is List and the memberType
> is
> > Playlist. However, when XWorkConverter.getConverter() tries to find the
> > converter for the individual members, even though Element_playlists=class
> > [converterpackage].PlaylistConverter is present in the mappings, the
> > property String passed in is still "playlists" instead of
> > "Element_playlists" and thus it does not hook up the playlist ID with the
> > converter and falls back to the default converter (which cannot handle it
> > and is what is raising the error).
> >
> > Any guidance as to what could be going wrong here would be greatly
> > appreciated.
> >
> > Thank you very much,
> > ~~Scott
> >
> >
> > PS--If it's useful, our system depends on the following libraries:
> >
> > ognl-3.0.jar
> > struts2-core-2.1.8.1.jar
> > xwork-core-2.1.6.jar
> >
>

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