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/*--



 Copyright (C) 2001 Brett McLaughlin.

 All rights reserved.



 Redistribution and use in source and binary forms, with or without

 modification, are permitted provided that the following conditions

 are met:



 1. Redistributions of source code must retain the above copyright

    notice, this list of conditions, and the following disclaimer.



 2. Redistributions in binary form must reproduce the above copyright

    notice, this list of conditions, and the disclaimer that follows

    these conditions in the do*****entation and/or other materials

    provided with the distribution.



 3. The name "Building Java Enterprise Applications" must not be used

    to endorse or promote products derived from this software without

    prior written permission.  For written permission, please contact

    brett@newInstance.com.



 In addition, we request (but do not require) that you include in the

 end-user do*****entation provided with the redistribution and/or in the

 software itself an acknowledgement equivalent to the following:

     "This product includes software developed for the

      'Building Java Enterprise Applications' book, by Brett McLaughlin

      (O'Reilly & Associates)."



 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED

 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 DISCLAIMED.  IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT

 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT

 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 SUCH DAMAGE.



 */

package com.forethought.ejb.event;



import java.rmi.RemoteException;

import java.util.Collection;

import java.util.Date;

import java.util.Iterator;

import java.util.LinkedList;

import javax.ejb.CreateException;

import javax.ejb.EJBException;

import javax.ejb.FinderException;

import javax.naming.Context;

import javax.naming.InitialContext;

import javax.naming.NamingException;



import com.forethought.ejb.sequence.SequenceException;

import com.forethought.ejb.sequence.SequenceLocal;

import com.forethought.ejb.sequence.SequenceLocalHome;

import com.forethought.ejb.util.EntityAdapter;



// User bean

import com.forethought.ejb.user.User;

import com.forethought.ejb.user.UserHome;

import com.forethought.ejb.user.UserInfo;

import com.forethought.ejb.user.UserLocal;

import com.forethought.ejb.user.UserLocalHome;



public abstract class EventBean extends EntityAdapter {



    public Integer ejbCreate(String description, Date dateTime,

                             Collection attendees)

        throws CreateException {

        // Get the next primary key value

        try {

            Context context = new InitialContext();



            // Note that RMI-IIOP narrowing is not required

            SequenceLocalHome home = (SequenceLocalHome)

                context.lookup("java:comp/env/ejb/SequenceLocalHome");

            SequenceLocal sequence = home.create();

            String eventKey =

                (String)context.lookup(

                    "java:comp/env/constants/EventKey");

            Integer id = sequence.getNextValue(eventKey);



            // Set values

            setId(id);

            setDescription(description);

            setDateTime(dateTime);



            return null;

        } catch (NamingException e) {

            throw new CreateException("Could not obtain an " +

                "InitialContext.");

        } catch (SequenceException e) {

            throw new CreateException("Error getting primary key value: " +

                e.getMessage());

        }

    }



    public void ejbPostCreate(String description, Date dateTime,

                              Collection attendees) {

        // Handle CMP relationships

        setAttendees(attendees);

    }



    public EventInfo getInfo() throws RemoteException {

        EventInfo eventInfo =

            new EventInfo(getId().intValue(), getDescription(), getDateTime(),

                          getAttendees());

        return eventInfo;

    }



    public void setInfo(EventInfo eventInfo) {

        setDescription(eventInfo.getDescription());

        setDateTime(eventInfo.getDateTime());

        setAttendees(eventInfo.getAttendees());

    }



    public Collection getAttendees() {

        try {

            Collection attendeesLocal = getAttendeesLocal();

            Collection attendees = new LinkedList();



            // Get the UserHome interface

            Context context = new InitialContext();

            UserHome userHome =

                (UserHome)context.lookup(

                    "java:comp/env/ejb/UserHome");



            // Convert each local User into a remote User

            for (Iterator i = attendeesLocal.iterator(); i.hasNext(); ) {

                UserLocal userLocal = (UserLocal)i.next();



                // Construct primary key for this office

                Integer userID = userLocal.getId();



                User user = userHome.findByPrimaryKey(userID);

                attendees.add(user);

            }



            return attendees;

        } catch (NamingException e) {

            throw new EJBException("Error looking up User bean: " +

                e.getMessage());

        } catch (RemoteException e) {

            throw new EJBException("Error looking up User bean: " +

                e.getMessage());

        } catch (FinderException shouldNeverHappen) {

            // This should never happen; the ID from a user's remote

            //   interface should match a user's ID in a local interface

            throw new EJBException("Error matching remote User to " +

                "local User: " + shouldNeverHappen.getMessage());

        }

    }



    public void setAttendees(Collection attendees) {

        try {

            // Handle case where no attendees supplied

            if (attendees == null) {

                setAttendeesLocal(null);

                return;

            }



            // Get the local User home interface

            Context context = new InitialContext();

            UserLocalHome userLocalHome =

                (UserLocalHome)context.lookup(

                    "java:comp/env/ejb/UserLocalHome");



            Collection attendeesLocal = new LinkedList();

            // Convert each remote User to a local User

            for (Iterator i = attendees.iterator(); i.hasNext(); ) {

                // Construct primary key for this office

                Integer userID;

                Object obj = i.next();



                if (obj instanceof User) {

                    userID = ((User)obj).getId();

                } else if (obj instanceof UserInfo) {

                    userID = new Integer(((UserInfo)obj).getId());

                } else {

                    throw new EJBException("Invalid object type in attendee " +

                        "list.");

                }



                // Find the local interface for this user

                UserLocal userLocal =

                    userLocalHome.findByPrimaryKey(userID);

                attendeesLocal.add(userLocal);

            }



            setAttendeesLocal(attendeesLocal);



        } catch (NamingException e) {

            throw new EJBException("Error looking up User bean: " +

                e.getMessage());

        } catch (RemoteException e) {

            throw new EJBException("Error looking up User bean: " +

                e.getMessage());

        } catch (FinderException shouldNeverHappen) {

            // This should never happen; the ID from a user's remote

            //   interface should match a user's ID in a local interface

            throw new EJBException("Error matching remote User to " +

                "local User: " + shouldNeverHappen.getMessage());

        }

    }



    public abstract Integer getId();

    public abstract void setId(Integer id);



    public abstract String getDescription();

    public abstract void setDescription(String description);



    public abstract Date getDateTime();

    public abstract void setDateTime(Date dateTime);



    public abstract Collection getAttendeesLocal();

    public abstract void setAttendeesLocal(Collection attendeesLocal);

}





/*

 *   Building Java Enterprise Applications

 *   By Brett McLaughlin

 *   First Edition March 2002

 *   ISBN: 0-596-00123-1

 *   http://www.oreilly.com/catalog/javentappsv1/

 */