RE: JESS: Jess Access Control

Thanks very much for that help!  It seems very simple now, but I couldn't figure the problem was coming from their, so I kept altering and testing the casting statment as opposed to checking the problem.  I didn't see that.  The sample program uses the Set.add() to add things to orderItems to orders, but it does it on a different statement and doesnt use the returned boolean.   It sure makes a lot of sense now!!  I actually have been constructing this piece by piece, I thought I was almost done.  I already had completed all the simpler classes by themselves and tested them and they were working.  The last demo database class Iis the one I have been really stuck on.  Even still after fixing that, after I run the program Im not getting the value of the file permission though, only the locati
 on of it.  I can't understand why this is happening.  Ill just repost the code.  At the end of the code I posted is the results of running the program.  Any help about how to fix this, or ev
 en about things I should be doing to better trouble shoot the problem wouldbe very much appreciated.

import java.util.ArrayList;
import java.util.Collection;

public interface Database
{
 public Collection getFiles();
 public Profile getProfile(int profileNumber);
}




import java.util.Iterator;
import jess.JessException;
public class Demo {
 public static void main(String[] args) {
  try {
   DemoDatabase database = new DemoDatabase();
   UserAccessEngine engine = new UserAccessEngine(database);

   processRole(database, engine, 1);
   processRole(database, engine, 2);
   processRole(database, engine, 3);
   processRole(database, engine, 4);
  }
  catch (JessException e)
  {
   e.printStackTrace();
  }
 }
 private static void processRole(DemoDatabase database, UserAccessEngine engine, int aID) throws JessException
 {
  //Iterator files, prints out a message prior to getting the needed info
  Iterator roles;
  System.out.println("First and Last Name of User " + aID + ":");
  String firstName = database.getProfile(aID).getfirst();
  String lastName = database.getProfile(aID).getlast();
  System.out.println(firstName + " " + lastName);

  roles = engine.run(aID);
  System.out.println("Roles for " + firstName + ":");
  while (roles.hasNext())
  {
   System.out.println("   " + roles.next());
  }
  System.out.println();
 }
}






import java.util.ArrayList;
import java.util.Map;
import java.util.Collection;
import java.util.HashMap;
/**
 * A toy implementation of the Database interface with some
 * hard-coded file and profile data.
 */

public class DemoDatabase implements Database {
 private ArrayList files;
 private Profile profile;
 private Map profiles;
 public DemoDatabase()
 {
  createFiles();
  createProfiles();
 }

 private void createProfiles()
 {
  profiles = new HashMap();
  ArrayList userProfiles = new ArrayList();
     profiles.put(new Integer(1), userProfiles.add(new Profile(1, "Mike", "Artz")));
     profiles.put(new Integer(2), userProfiles.add(new Profile(2, "Suzy", "Kolber")));
     profiles.put(new Integer(3), userProfiles.add(new Profile(3, "Stan", "Mikita")));
     profiles.put(new Integer(4), userProfiles.add(new Profile(4, "Nikita", "Kruschev")));

 }
 private void createFiles() {
  files = new ArrayList();
  files.add(new FileRead("Mike", "Artz", "file.txt", 1));
  files.add(new FileRead("Tom", "Saywer", "picOfYourMom.jpg", 5));
  files.add(new FileRead("Chris", "Webber", "NBAJAMS.exe", 6));
 }
 public Collection getFiles() {
  return files;
 }
 public Profile getProfile(int profileNumber)
 {
  //return new Profile(1, "Mike", "Artz");
  return (Profile)profiles.get(new Integer(profileNumber));
 }
}





public class FilePermission
{
private String fileName;
private int profileNum;
private String last;
private String first;
private String role;


public FilePermission(String aFileName, int aProfileNum, String aLast, String aFirst, String aRole)
{
last = aLast;
first = aFirst;
fileName = aFileName;
profileNum = aProfileNum;
role = aRole;
}

public String getfileName()
{
return fileName;
}

public int getprofileNum()
{
return profileNum;
}
public String getlast()
{
return last;
}

public String getfirst()
{
return first;
}

public String getrole()
{
return role;
}
}








public class FileRead
{
private String ownerFirst;
private String ownerLast;
private String file;
private int ownerID;

public FileRead(String aFirst, String aLast, String aFile, int aOwnerID)
{
ownerFirst = aLast;
ownerLast = aFirst;
file = aFile;
ownerID = aOwnerID;
}

　
public String getownerFirst()
{
return ownerFirst;
}

public String getownerLast()
{
return ownerLast;
}

public String getFile()
{
return file;
}

public int getownerID()
{
return ownerID;
}
}



public class Profile
{
private String last;
private String first;
private int idNum;


public Profile(int aID, String aFirst, String aLast)
{
idNum = aID;
last = aLast;
first = aFirst;
}

public String getlast()
{
return last;
}

public String getfirst()
{
return first;
}

public int getidNum()
{
return idNum;
}
}







import jess.*;
import java.util.Iterator;

public class UserAccessEngine
{

private Rete engine;
private WorkingMemoryMarker marker;
private Database database;

public UserAccessEngine(Database aDatabase) throws JessException
{
// Create a Jess rule engine
engine = new Rete();
engine.reset();

// Load the user access rules
engine.batch("C:\\Users\\Michael\\workspace\\JessUserAccess\\lib\\users.clp");

// Load the user access data into working memory
database = aDatabase;
engine.addAll(database.getFiles());

// Mark end of user access data for later
marker = engine.mark();
}

private void loadOrderData(int profileNumber) throws JessException
{
// Retrive the profile from the database
Profile profile = database.getProfile(profileNumber);

if (profile != null)
{
// Add the profile to working memory
engine.add(profile);

}
}

public Iterator run(int profileNumber) throws JessException
{
// Remove any previous user access data, leaving only catalog data
engine.resetToMark(marker);

// Load data for this profile
loadOrderData(profileNumber);

// Fire the rules that apply to this profile
engine.run();

// Return the list of roles created by the rules
return engine.getObjects(new Filter.ByClass(FilePermission.class));
}
}


THIS IS MY JESS FILE


;; First define templates for the model classes so we can use them
;; in our user access rules. This doesn't create any model objects --
;; it just tells Jess to examine the classes and set up templates
;; using their properties

(import C:.Users.Michael.workspace.JessUserAccess.src*)


;; (deftemplate FilePermission (declare (from-class
;; FilePermission)))

(deftemplate FileRead (declare (from-class FileRead)))
(deftemplate Profile (declare (from-class Profile)))

;; Now define the user access rules themselves. Each rule matches a set
;; of conditions and then creates a Role object to represent a
;; role that user has on a file. The rules assume that
;; there will be just one User, along with all the Files.


(defglobal ?*read-write* = read-write)
(defglobal ?*read* = read)

(defrule owner-role
"Give a user the read-write role if he or she is the owner of the file."
(FileRead (ownerFirst ?ownerFirst)(ownerLast ?ownerLast)(file ?file)(ownerID ID?))
(Profile(first ?ownerFirst)(last ?ownerLast) (idNum ?ID))
=>
(add (new FilePermission ?file ?ID ?ownerLast ?ownerFirst
?*read-write*)))

(defrule read-role
"Give a user the read role if he or she is not the owner of the file."
(FileRead (ownerFirst ?ownerFirst)(ownerLast ?ownerLast)(file ?file) (ownerID ?ID))
(Profile(first ?First)(last ?Last) (idNum ?idNum))
=>
(add (new FilePermission ?file ?idNum ?Last ?First ?*read*)))




First and Last Name of User 1:
Mike Artz
Roles for Mike:
FilePermission@186db54
FilePermission@a97b0b
FilePermission@cd2c3c


First and Last Name of User 2:
Suzy Kolber
Roles for Suzy:
FilePermission@506411
FilePermission@1d99a4d
FilePermission@56a499


First and Last Name of User 3:
Stan Mikita
Roles for Stan:
FilePermission@1e859c0
FilePermission@c9ba38
FilePermission@1e0be38


First and Last Name of User 4:
Nikita Kruschev
Roles for Nikita:
FilePermission@1430b5c
FilePermission@1aaa14a
FilePermission@7a84e4


> From: [email protected]
> To: [email protected]
> Subject: Re: JESS: Jess Access Control
> Date: Fri, 7 Jan 2011 20:30:00 -0500
>
>
> On Jan 7, 2011, at 8:06 PM, Michael Eugene Artz wrote:
> > It's a casting error but it doesn't make any sense to me why I
> > would be getting that.
>
> userProfiles is a java.util.Set. The method Set.add() returns boolean
> (true means the add() succeeded, false means the object was already in
> the set.) So here you're mapping Integer to Boolean.
>
>
> > profiles.put(new Integer(1), userProfiles.add(new Profile(1,
> > "Mike", "Artz")));
> > profiles.put(new Integer(2), userProfiles.add(new Profile(2,
> > "Suzy", "Kolber")));
> > profiles.put(new Integer(3), userProfiles.add(new Profile(3,
> > "Stan", "Mikita")));
> > profiles.put(new Integer(4), userProfiles.add(new Profile(4,
> > "Nikita", "Kruschev")));
> >
>
> Here you're assuming that the values in profiles are Profile objects,
> but as we said, they're Booleans.
>
>
> > public Profile getProfile(int profileNumber)
> > {
> > //return new Profile(1, "Mike", "Artz");
> > return (Profile)profiles.get(new Integer(profileNumber));
> > }
> >
>
> Which is what the error says: the values are Booleans, not Profiles.
> The trace tells you exactly what line causes the errors, so a
> println() or two would have easily told you the whole story.
>
>
> > java.lang.ClassCastException: java.lang.Boolean cannot be cast to
> > Profile
> > at DemoDatabase.getProfile(DemoDatabase.java:49)
> > at Demo.processRole(Demo.java:31)
> > at Demo.main(Demo.java:13)
> >
> >
> > I wonder if I could this all much simpler and Im just wasting my
> > time completely:(
> >
>
>
> When I assemble a large program like this, I start with a small
> program that does one little thing, and I test it. I then add a little
> more, and test that, and so on. At each step, I make sure all the new
> code does what it's supposed to do. I keep all the test code so it can
> be run at any time to verify that the program still works. That way,
> you never find yourself looking at a big pile of code and wondering
> where the problem is: the problem is always just in that last little
> bit you just coded.
>
> Good luck!
>
>
> ---------------------------------------------------------
> Ernest Friedman-Hill
> Informatics & Decision Sciences Phone: (925) 294-2154
> Sandia National Labs
> PO Box 969, MS 9012 [email protected]
> Livermore, CA 94550 http://www.jessrules.com
>
>
>
>
>
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