/*
    Create Version.Txt from JExpress Control File

    This example shows 
      1. how to create a panel which does *not* interact with the user
      2. how to extract information from the installer's property list
      3. it inherits from StatusPanel instead of WizardPanel to maintain a
         consistent look between non-interactive panels.

    Important Note:
     1. This panel should not really be used because JExpress installers
        already create the version info in the JExpress subdirectory of
        your installation directory. This class is strictly as a simple
        example of how to create a custom class.

    Copyright (C) 1998-2012 DeNova
    Last modified: 2012-01-12
    
*/


import java.io.File;
import java.io.FileOutputStream;
import com.denova.ui.UserNotices;
import com.denova.util.PropertyList;
import com.denova.JExpress.Installer.CustomInstaller;
import com.denova.JExpress.Installer.CustomUninstaller;
import com.denova.JExpress.Installer.InstallPropertyNames;
import com.denova.JExpress.Installer.StatusPanel;


public class VersionPanel extends StatusPanel 
                          implements InstallPropertyNames {

    private String progressLabel = CustomInstaller.getLocalizedString("UpdatingVersion");
    
    
    public VersionPanel(PropertyList properties)
    {
        super (properties);
        
        updateProgressBarLabel(progressLabel);
    }
    
    /** 
     * Enter the panel. 
     *
     * Do not call this method; only the wizard should call it.
     */
     public void enter()
     {
        // let them know what's happening
        updateProgressBarLabel(progressLabel);
        
        // we don't actually want to interact with the user
    
        // this panel simply copies key information from jex.control
        // to a text file in the installation directory
    
        String applicationDirectory =
               getPropertyList (). getProperty ( ApplicationDirectory, "" );

        // only do this after we know where the installation directory is
        if ( applicationDirectory != null ) {

            // let's create a local property list that holds just the info we want
            PropertyList list = new PropertyList();

            // get the following properties from the control file
            // and if any of the properties don't exist, then default them to blank fields
            list. setProperty ( PackageName,
                                getPropertyList ().getProperty ( PackageName, "" ) );
            list. setProperty ( WebSite,
                                getPropertyList ().getProperty( WebSite, "" ) );
            list. setProperty ( PackageCopyright,
                                getPropertyList ().getProperty( PackageCopyright, "" ) );
            list. setProperty ( PackageVersion,
                                getPropertyList ().getProperty( PackageVersion, "" ) );

            // save the information to a text file
            File f = new File ( applicationDirectory, VersionFilename );
            try {
                FileOutputStream o = new FileOutputStream ( f );

                // save the property list
                list. save ( o, "Version" );

                // close the output stream
                o. close ();
           }
           catch ( Exception e ) {

               // if anything goes wrong, let the user know
               UserNotices un = new UserNotices();
               un.noteError ( "Unable to save the version information" );

           }

            // append the appropriate commands to the uninstaller
            CustomUninstaller customUninstaller = new CustomUninstaller ();

            File versionFile = new File ( applicationDirectory, VersionFilename );
            customUninstaller. deleteFile ( versionFile. getPath () );

            customUninstaller. append ( applicationDirectory );
        }


        // we don't want any user interaction
        // so move them to the next panel automatically
        showNextPanel ();
    }


    static final String VersionFilename = "version.txt";

}  // VersionPanel