Re: About the viewers

Hi Roger:

I dont understand what is wrong with your class, but i get same results with it. But when I recompile, it works ok. 

if I dissamble your class, I see:

public class saidinViewer.Start extends java.lang.Object{
   public saidinViewer.Start();
   public boolean isViewable(thredds.catalog.InvDatasetImpl);
   public java.lang.String getViewerLinkHtml(thredds.catalog.InvDatasetImpl, 
javax.servlet.http.HttpServletRequest);
}

but when i recompile your source, i get:

public class saidinViewer.Start extends java.lang.Object implements 
thredds.servlet.Viewer{
   public saidinViewer.Start();
   public boolean isViewable(thredds.catalog.InvDatasetImpl);
   public java.lang.String getViewerLinkHtml(thredds.catalog.InvDatasetImpl, 
javax.servlet.http.HttpServletRequest);
}

So im guuessing you just need to recompile the source correctly.

However, placing this code into tomcat/shared/lib does not work, i think due to 
classloading issues. For now, you will have to put it directly into 
webapps/thredds/WEB-INF/lib or classes. I will see if I can figure out a way 
around that.

Thanks for bringing this to my attention. My testing failed to see this problem.

John




Roger Olivella wrote:
> John,
>
> I'm having some problems in registering our viewer. First of all, I've 
> created a class that implements the Viewer interface (see attached file 
> Start.java). Then I've zipped this file into a JAR file (attached 
> saidin-viewer.jar) and put it into /usr/local/tomcat/shared/lib. 
> Finally, I've restarted Tomcat. Unfortunately, something goes wrong 
> because at, for example,
>
> http://ers.cmima.csic.es/thredds/catalog.html?cmd=subset&catalog=http://ers.cmima.csic.es/thredds/catalog/ers/2002/02-Feb/02/catalog.xml&dataset=ers/2002/02-Feb/02/20020202.1342.n16.nc.bz2 
>
>
> it doesn't appear our viewer. I've looked at threddsServlet.log and 
> found an error:
>
> 2007-01-31T10:14:21.607 +0100 [       607][       1] ERROR - 
> thredds.servlet.ViewServlet - Attempt to load class saidinViewer.Start 
> does not implementthredds.servlet.Viewer
>
>
> What I'm doing wrong?
>
> Thank you for your help.
>
> Roger
>
>
>
> J ohn Caron wrote:
>
> > Youre welcome, let me know how it goes. we will have the code 
> > available over an svn web server soon also.
> >
> > Roger Olivella wrote:
> >
> > > John,
> > >
> > > I've downloaded the JAR. Now I'm going to install it.
> > >
> > > Thank you very much.
> > >
> > > Roger
> > >
> > > John Caron wrote:
> > >
> > > > source is at
> > > >  ftp://ftp.unidata.ucar.edu/pub/thredds/tmp/threddsSrc-2.2.18.02.jar
> > > >
> > > > sorry that took so long.
> > > >
> > > > please let me know when you have downloaded so i can remove it.
> > > >
> > > >
> > > >
> > > > Roger Olivella wrote:
> > > >
> > > > > Hi all,
> > > > >
> > > > > We are working on installing and configuring a Thredds server at 
> > > > > http://ers.cmima.csic.es/thredds. We have two questions about the 
> > > > > viewers:
> > > > >
> > > > >    1.
> > > > >
> > > > >       When a user clicks on “Integrated Data Viewer (IDV) (webstart)”
> > > > >       (for example at
> > > > >       
> > > > > http://ers.cmima.csic.es/thredds/catalog.html?cmd=subset&catalog=http://ers.cmima.csic.es/thredds/catalog/ers/2001/08/25/catalog.xml&dataset=ers/2001/08/25/20010825.1343.n16.nc.bz2 
> > > > >
> > > > >       
> > > > > <http://ers.cmima.csic.es/thredds/catalog.html?cmd=subset&catalog=http://ers.cmima.csic.es/thredds/catalog/ers/2001/08/25/catalog.xml&dataset=ers/2001/08/25/20010825.1343.n16.nc.bz2>), 
> > > > >
> > > > >       webstart loads IDV but it doesn't load directly the
> > > > >       20010825.1343.n16.nc.bz2 file. Are we missing something?
> > > > >
> > > > >    2.
> > > > >
> > > > >       We are trying to add another external viewer. According to
> > > > >       
> > > > > http://www.unidata.ucar.edu/projects/THREDDS/tech/tutorial/Viewers.html, 
> > > > >
> > > > >       fisrt of all we have to implement the Viewer interface. The
> > > > >       question is: where is this interface? At the documentation it 
> > > > > can
> > > > >       be read that “Your class must implement the
> > > > >       *thredds.servlet.Viewer* interface” but where can we find
> > > > >       “thredds.servlet” package?
> > > > >
> > > > > Thanks in advance,
> > > > >
> > > > > Roger Olivella-Pujol
> > > > > Institute of Marine Sciences (CMIMA-CSIC)
> > > > > Barcelona, Catalonia (Spain)
> > > > > (+34) 932 309 500 voice
> > > > > http://saidin.cmima.csic.es <http://saidin.cmima.csic.es/>
>
> ------------------------------------------------------------------------
>
> package saidinViewer;
>
> import thredds.catalog.*;
> import javax.servlet.http.HttpServletRequest;
> import java.net.*;
> import thredds.servlet.Viewer;
>
>
> public class Start implements Viewer {
>
>          public boolean isViewable( InvDatasetImpl ds) {
>            InvAccess access = ds.getAccess(ServiceType.DODS);
>            if (access == null) access = ds.getAccess(ServiceType.OPENDAP);
>          if (access == null) return false;
>
>          return (ds.getDataType() == DataType.GRID);
>          }
>
>          public String getViewerLinkHtml( InvDatasetImpl ds, HttpServletRequest 
> req) {
>            InvAccess access = ds.getAccess(ServiceType.DODS);
>          if (access == null) access = ds.getAccess(ServiceType.OPENDAP);
>
>          URI dataURI = access.getStandardUri();
>            try {
>             URI base = new URI( req.getRequestURI().toString());
>            dataURI = base.resolve( dataURI);
>            } catch (URISyntaxException e) {
>                    e.printStackTrace();
>                    System.out.println("Resolve URL with "+req.getRequestURI());
>            }
>
>          //return "<a 
> href='/thredds/view/idv.jnlp?url="+dataURI.toString()+"'>IDV</a>";
>            return "<a 
> href='http://ers.cmima.csic.es/saidin?img="+dataURI.toString()+"'>SAIDIN</a>";
>          }
> }