New MapLayer constructor to pass GeneralParameterValue[] reader paramters

[Stefan Tzeggai]

Hi

In reply to my mail "How to set the transparent color on an ImagePyramidReader
or ImageMosaicReader", Simone and I figured out on IRC yesterday, that it might
be a good idea to add a new constructor to DefaultMapLayer that allows to
define the "read-parameters" for a GridCoverage2DReader.

When a user (like i did) creates a new DefaultMapLayer for an
AbstractGridCoverage2DReader, the Reader will be wrapped as a
FeatureCollection using FeatureUtilities.wrapGridCoverageReader(reader,null).
There is no way to pass GeneralParameterValues[] to the wrapper function, as
null is always used. The new constructor would roughly look like:

>public DefaultMapLayer(AbstractGridCoverage2DReader reader,  
GeneralParameterValue[] params, Style style, String title) {
> this(FeatureUtilities.wrapGridCoverageReader(reader,params), style, title);
>}

It would allow to use a
 mapContext.addLayer ( new DefaultMapLayer(Coverage2DReader ...) )
and still pass read parameters, which was rather hard to do before.

Any comments welcome.. otherwise i will write a patch tomorrow.

Greetz
Steve


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[Stefan Tzeggai]

Hi

Created a JIRA with the patch for it.

http://jira.codehaus.org/browse/GEOT-2789

Greetz,
Steve

Am Donnerstag 01 Oktober 2009 09:17:59 schrieb Stefan Krüger:

> Hi
>
> In reply to my mail "How to set the transparent color on an
> ImagePyramidReader or ImageMosaicReader", Simone and I figured out on IRC
> yesterday, that it might be a good idea to add a new constructor to
> DefaultMapLayer that allows to define the "read-parameters" for a
> GridCoverage2DReader.
>
> When a user (like i did) creates a new DefaultMapLayer for an
> AbstractGridCoverage2DReader, the Reader will be wrapped as a
> FeatureCollection using
> FeatureUtilities.wrapGridCoverageReader(reader,null). There is no way to
> pass GeneralParameterValues[] to the wrapper function, as
>
> null is always used. The new constructor would roughly look like:
> >public DefaultMapLayer(AbstractGridCoverage2DReader reader,
>
> GeneralParameterValue[] params, Style style, String title) {
>
> > this(FeatureUtilities.wrapGridCoverageReader(reader,params), style,
> > title); }
>
> It would allow to use a
>  mapContext.addLayer ( new DefaultMapLayer(Coverage2DReader ...) )
> and still pass read parameters, which was rather hard to do before.
>
> Any comments welcome.. otherwise i will write a patch tomorrow.
>
> Greetz
> Steve

--
wiki² - Softwareentwicklung
Stefan Krüger
Straßburger Weg 26
53113 Bonn

email [hidden email]
mobile [phone]
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information on every electronic information exchange with me is
retained for a period of six months.



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