Hi,
1. why pass ServletContext, pass the String from
sc.getRealPath to a bean.
2. you can put your ini info in an xml and use a
program generation approach.
3. you can use a 'shell' class, that reads key/value
pairs into an 'ordered' hashtable (if order is
important), and have custom get( String key ) and set(
k, v) methods to change values in the ordered
hashtable.
just some thoughts.
ron
--- Rodrigo Gevaerd <[EMAIL PROTECTED]> wrote:
> Thanks for your replies, Ron. But I think you did
> not quite understand
> the kind of problem here. The problem is how to do
> the functionallity of the
> code you wrote but without having to write another
> class like App1Constant
> or App2Constant when you add another application to
> the server. More than
> that... actually I want no change to code at all.
> This can be done, for
> example, this way:
>
> Have this start up code to run before anything
> else in the application:
>
> getServletContext().setAttribute("Const", new
> Constant(getServletContext()));
>
> And at Constant do:
>
> public Constant(ServletContext sc)
> {
> String fileNameToReadValues =
> sc.getRealPath("/constant.ini");
>
> // read values from 'fileNameToReadValues'
> }
>
> This way, when adding another application, the
> same code may be used. Only
> the constant.ini file in the new application will be
> different (because it
> will contain the values the application will use).
> But there is a problem
> doing this way: all classes that want access to
> Constant must have access to
> ServletContext, because only that way they will
> obtain the right Constant
> instance (through the getAttribute method). This
> problem can be worked out
> by giving every class a reference to ServletContext.
> But I was asking if
> anyone have a better solution for this problem than
> doing all these.
>
>
> Rodrigo.
>
>
> > -----Mensagem original-----
> > De: Ron Chan [mailto:[EMAIL PROTECTED]]
> > Enviada em: Segunda-feira, 9 de Abril de 2001
> 13:25
> > Para: [EMAIL PROTECTED]
> > Assunto: Re: Organizing Application Constants
> >
> >
> > hi,
> >
> > something like:
> >
> >
> > 1 import java.util.*;
> >
> > 2 public abstract class AbstractConstant
> > 3 {
> > 4 public final static int APP1 = 1;
> > 5 public final static int APP2 = 2;
> > 6 private final static String cdb =
> > "currentDB";
> > 7 private final static String DBURL =
> > "dbURL";
> >
> > 8 public static class App1Constant
> extends
> > AbstractConstant {
> > 9 public App1Constant() {
> > 10 super();
> > 11 setDBUrl( rb.getString( DBURL
> + currentDB
> > + APP1 ) );
> > 12 }
> > 13 }
> > 14 public static class App2Constant
> extends
> > AbstractConstant {
> > 15 public App2Constant() {
> > 16 super();
> > 17 setDBUrl( rb.getString( DBURL
> + currentDB
> > + APP2 ) );
> > 18 }
> > 19 }
> >
> > 20 private String dbURL = null;
> > 21 private String rbString = "ac";
> > 22 protected ResourceBundle rb = null;
> > 23 protected String currentDB = null;
> >
> > 24 public AbstractConstant() {
> > 25 rb = ResourceBundle.getBundle(
> rbString );
> > 26 currentDB = rb.getString( cdb );
> > 27 }
> >
> > 28 public void setDBUrl( String s ) {
> > 29 this.dbURL = s;
> > 30 }
> > 31 public String getDBUrl() {
> > 32 return this.dbURL;
> > 33 }
> > 34 public static AbstractConstant Create(
> int
> > i ) {
> > 35 AbstractConstant ap = null;
> > 36 if( APP1 == i ) {
> > 37 ap = new
> AbstractConstant.App1Constant();
> > 38 }
> > 39 else if( APP2 == i ) {
> > 40 ap = new
> AbstractConstant.App2Constant();
> > 41 }
> > 42 return ap;
> > 43 }
> > 44 }
> >
> >
> > 45 public class App1
> > 46 {
> > 47 private AbstractConstant abcon =
> > AbstractConstant.Create( AbstractConstant.APP1 );
> > 48 public App1() {
> > 49 System.out.println( "1 dburl: " +
> > abcon.getDBUrl() );
> > 50 }
> > 51 public static void main( String[] arg
> ) {
> > 52 App1 ap = new App1();
> > 53 }
> > 54 }
> >
> >
> > 55 public class App2
> > 56 {
> > 57 private AbstractConstant abcon =
> > AbstractConstant.Create( AbstractConstant.APP2 );
> > 58 public App2() {
> > 59 System.out.println( "2 dburl: " +
> > abcon.getDBUrl() );
> > 60 }
> > 61 public static void main( String[] arg
> ) {
> > 62 App2 ap = new App2();
> > 63 }
> > 64 }
> >
> > 65 currentDB=oracle
> > 66 dbURLpostgres1=something1
> > 67 dbURLpostgres2=something2
> >
> > 68 dbURLoracle1=somethingElse1
> > 69 dbURLoracle2=somethingElse2
> >
> > ron
>
>
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