I don't think there is one in Commons yet. I've had one for myself for a
bit and it can be a lifesaver sometimes.
BeanComparator bc = new BeanComparator("[1]"); was very sweet when I
realised that would work :) Not just Beans but also arrays/collections.
I'm +1 for a BeanComparator, +1 in that I plan to do it sometime but have
not had the time to learn the Jakarta BeanUtils and stop using my own.
Hen
On Fri, 7 Jun 2002, Eric Pugh wrote:
> Hi all,
>
> I have a series of Torque objects that I want to sort. Sometimes I want to
> sort by MethodA, sometiems by MethodB. (Basically mapping onto all the
> columns in my database).
>
> Right now, I have a comparator compare method that looks like this:
> public int compare( Object o1, Object o2 ) {
> Daughterboard db1 = (Daughterboard) o1;
> Daughterboard db2 = (Daughterboard) o2;
> int sort = 0;
> if ( sortMethod.equals( "ScintillationFileNumber" ) ) {
> /*
> * if ( db1 == null == db2 ) {
> * return 0;
> * }
> * else if (db1 == null &&
> */
> sort = Strings.clean( db1.getScintillationFileNumber()
>).compareTo(
> Strings.clean( db2.getScintillationFileNumber() ) );
>
> }
> else if ( sortMethod.equals( "DaughterboardId" ) ) {
> sort = db1.getDaughterboardId().compareTo(
>db2.getDaughterboardId() );
> }
> if ( sortPolarity.equals( "desc" ) ) {
> sort = sort * -1;
> }
>
> return sort;
> }
>
> What I really want to do is pass in a sortMethod like
> ScintillationFileNumber, and dynamically call the objects getter for that
> name. If I wrap my object in a WrapDynaBean, and use that to call the data,
> will is actually change the ordering of my objects? Or should I just use
> the WrapDynaBean locally inside of my compare method to facilitate calling
> the methods?
>
> First time using BeanUtils, but it looks great..
>
> Lastly, would a comparator like this be something of general interest to add
> to the collections list of comparators?
>
> Eric
>
>
>
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