Hi again list,
I'm doing some investigations on the first option (update the mapping
before creating the feature) for this task.
As you know, we need to add new entries in records containing the
DownloadLinks.
That means, adding:
- additional references
<http://dublincore.org/documents/dcmi-terms/#terms-references> elements in
the DublinCore format
- additional OnlineReference
<http://www.isotc211.org/2005/gmd/citation.xsd> elements in ISOTC211
I say *additional* since the default properties already contain these
static mappings:
*DC records.*
references.scheme='OGC:WMS'
references.value=strConcat('${url.wms}?service=WMS&request=GetMap&layers=',
prefixedName)
*ISOTC211 metadata.*
distributionInfo.MD_Distribution.transferOptions.MD_DigitalTransferOptions.onLine.CI_OnlineResource%
*.linkage.**URL=list('${url.wfs}','${url.wms}')*
distributionInfo.MD_Distribution.transferOptions.MD_DigitalTransferOptions.onLine.CI_OnlineResource%
*.protocol.CharacterString=**list('OGC:WFS','OGC:WMS')*
distributionInfo.MD_Distribution.transferOptions.MD_DigitalTransferOptions.onLine.CI_OnlineResource%.name.CharacterString=name
So, I need to add more references.value / linkage.URL entries to the
feature.
What I would like to do is adding elements to the RecordBuilder in the
CatalogStoreFeatureIterator.mapProperties before it creates the feature.
I have checked the underlying treeNodes structure and I'm having some
issues in understanding how should I add these new entries to the builder
for the existing mappings.
One Idea I have is checking the mappingKey and, in case it matches a
specific value (as "references.value" or whatelse), adds more values to the
elements array to be provided to the builder. (I would setup some
mappingCustomizer which does this: updating the elements array in case the
resource has the DirectDownload capability enabled).
However, it seems to me that the underlying TreeNode structure + path
splitting doesn't allow to add elements not having the same tree structure.
I mean: in case I add a OnlineResource.linkage.URL value, the builder will
complain since it notices that the current OnlineResource tree has 2 leaves
(the previously created OnlineResource for wfs and wms protocol) whilst the
URL array has now 3 elements throwing an IllegalArgumentException due to
number not matching.
I'm wondering if I should delay the addElement invokations once I have all
the elements ready for all mappings OR if I should relax somehow these
cardinality checks. Still need to understand how, since the treeNodes are
progressively added to the tree. Moreover, "linkage" is the only mandatory
element of CI_OnlineResource so some treeNodes may have less leaves (as an
instance, the optional "protocol" element).
Feedbacks are very welcome.
Cheers,
Daniele
(Sorry Niels if I have put you on CC but I would like to get some hints
from you being the one with top experience on the topic).
On Wed, Sep 23, 2015 at 11:30 AM, Daniele Romagnoli <
[email protected]> wrote:
> Hi List,
> we are back working on the "Direct Download links from CSW" topic started
> by Andrea some months ago.
> We would like to share some opinions on it in order to collect couple of
> feedbacks.
>
> Summarizing the main concept and restoring previous discussions:
> For a Layer, we would like to enable a "DirectDownload" capability.
> (We can consider adding a checkBox on wicket in the layer config panel,as
> well as a Global option to enable/disable this operation).
> Then, for that layer we would like to provide a DirectDownload of the raw
> data as part of a CSW record/metadata, something like:
> http://host:port/geoserver/ows?service
> =CSW&version=2.0.1&request=DirectDownload&resourceId=<layerName>
>
> As you know, an ImageMosaic based layer may refer to multiple files so we
> will show several links (1 for each file composing the mosaic) with
> summarizing details on dimensions ranges for that file. Something like this:
>
> http://host:port/geoserver/ows?service=CSW&version=2.0.1&;
> request=DirectDownload&resourceId=<layerName>:<fileName>&time=from/to&
> elevation=from/to&bbox=xmin,ymin,xmax,ymax&custDim=from/to
>
> At the moment, CSW entries are built through a static mapping based on
> property file which allows to populate CSW keys from internal GeoServer
> Catalog elements.
> As an instance, quoting some entries from Record.default.properties
> mapping file:
>
> *title.value=if_then_else(isNull(title), name, title)*
> *creator.value='GeoServer Catalog'*
> *subject.value=keywords*
> *abstract.value=abstract*
>
> CatalogStoreMappingElements are Key,Expression pairs.
> Adding a new entry to the mapping for this new capability could be an
> option but I'm a bit against that since it depends on status of global
> Download enabled.
> Moreover, it could be tricky to encode the mapping as an Expression (to be
> supported by a FilterFunction).
>
> Therefore, we are thinking about 2 alternative options:
> 1) Adding a way to change the mappings before they are applied.
> We could think about adding a mechanism which checks if the layer has the
> DirectDownload capability enabled and then add a new mapping element which
> queries the underlying store to return the associated files to be used to
> setup the link.
>
> 2) Setting up a plugin (something like a FeatureCustomizer) which
> customizes the feature being built by the RecordBuilder, in order to add
> the download link.
>
> What do you think about it?
> Any feedback will be appreciated.
>
> Cheers,
> Daniele
>
>
>
>
>
>
>
>
>
> --
> ==
> GeoServer Professional Services from the experts! Visit
> http://goo.gl/it488V for more information.
> ==
>
> Ing. Daniele Romagnoli
> Senior Software Engineer
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
> phone: +39 0584 962313
> fax: +39 0584 1660272
>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
> -------------------------------------------------------
>
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> The information in this message and/or attachments, is intended solely for
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--
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/it488V for more information.
==
Ing. Daniele Romagnoli
Senior Software Engineer
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
-------------------------------------------------------
*AVVERTENZE AI SENSI DEL D.Lgs. 196/2003*
Le informazioni contenute in questo messaggio di posta elettronica e/o
nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
loro utilizzo è consentito esclusivamente al destinatario del messaggio,
per le finalità indicate nel messaggio stesso. Qualora riceviate questo
messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
darcene notizia via e-mail e di procedere alla distruzione del messaggio
stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
utilizzarlo per finalità diverse, costituisce comportamento contrario ai
principi dettati dal D.Lgs. 196/2003.
The information in this message and/or attachments, is intended solely for
the attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act
(Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
Code).Any use not in accord with its purpose, any disclosure, reproduction,
copying, distribution, or either dissemination, either whole or partial, is
strictly forbidden except previous formal approval of the named
addressee(s). If you are not the intended recipient, please contact
immediately the sender by telephone, fax or e-mail and delete the
information in this message that has been received in error. The sender
does not give any warranty or accept liability as the content, accuracy or
completeness of sent messages and accepts no responsibility for changes
made after they were sent or for other risks which arise as a result of
e-mail transmission, viruses, etc.
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