Re: Wait for User Input

Hi,

Thanks for your help.

Best regards,

/Ari


>>> Ichiro Furusato  05/16/13 11:00 AM >>>
Ack. @#$%*&! Gmail. It sent if off before I was done editing. The only
thing that actually needs changing is that the line preceding the
declaration file should read:

---------------------- declare-option-dialog.xpl ---------------------


and not the Java class. Sorry for any confusion.


Ichiro



On Thu, May 16, 2013 at 8:56 PM, Ichiro Furusato
<ichiro.furusato@gmail.com> wrote:
Hi Ari,

I've had a number of occasions to develop what are essentially
pass-through steps, i.e., steps that do something related to the
pipeline but don't alter the actual content flowing through. Below is a
very quick shell of a step that displays a JOptionPane that displays a
dialog upon encountering the step. This could obviously be improved by
adding passed arguments, actually altering processing based upon the
chosen option, etc., but I leave that as an exercise to the implementer
since I don't know what you'd plan to do with it. 

Hopefully it's helpful.

Here's the declaration:

---------------------- OptionDialogStep.java ---------------------
    
    http://acme.com/xproc/1.0/"
        xmlns:p="http://www.w3.org/ns/xproc">
    
       
       
    
    

This must be imported into an existing pipeline using:

    

and then used as a step, e.g.,

    
        
            This is a step used to display an option dialog.
        
    

And here's the Java code (which I release without license restriction):

---------------------- OptionDialogStep.java ---------------------

package com.acme.transform;

import net.sf.saxon.s9api.SaxonApiException;
import net.sf.saxon.s9api.XdmNode;

import com.xmlcalabash.core.XProcRuntime;
import com.xmlcalabash.io.ReadablePipe;
import com.xmlcalabash.io.WritablePipe;
import com.xmlcalabash.library.DefaultStep;
import com.xmlcalabash.runtime.XAtomicStep;
import javax.swing.JOptionPane;

/**
 *  An XProc step that displays a dialog box.
 * 
 * @author Ichiro Furusato
 */
public class OptionDialogStep extends DefaultStep
{
    private ReadablePipe source = null;  // the source of this step
    private WritablePipe result = null;  // the result of this step


    public OptionDialogStep( XProcRuntime runtime, XAtomicStep step )
    {
        super(runtime, step);
    }


    @Override
    public final void setInput( String port, ReadablePipe pipe )
    {
        source = pipe;
    }


    @Override
    public final void setOutput( String port, WritablePipe pipe )
    {
        result = pipe;
    }
    

    @Override
    public void reset()
    {
        if ( source != null ) {
            source.resetReader();
        }
        if ( result != null ) {
            result.resetWriter();
        }
    }
    
    
    @Override
    public void run() throws SaxonApiException
    {
        try {
            Object message = "Dialog message here.";
            String title   = "Dialog Title";
            int option = JOptionPane.showConfirmDialog(null,
                    message, title, JOptionPane.YES_NO_CANCEL_OPTION);  
         
            switch ( option ) {
                case JOptionPane.YES_OPTION:
                    System.out.println("option: YES_OPTION");
                    break;
                case JOptionPane.NO_OPTION:
                    System.out.println("option: NO_OPTION");
                    break;
                case JOptionPane.CANCEL_OPTION:
                    System.out.println("option: CANCEL_OPTION");
                    break;
                default:
                    System.out.println("option: default");
                    break;
            }            
            super.run();
            
            // get Saxon document from pipeline
            XdmNode doc = source.read();
            if ( doc == null ) {
                throw new IllegalStateException("null document.");
            }
            // pass through pipeline
            result.write(doc);
            
        } catch ( Exception e ) {
            throw new SaxonApiException(e.getClass().getName()
                    + " thrown by OptionDialogStep: "
                    + e.getLocalizedMessage(), e);
        }
    }

  
} // end OptionDialogStep







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