Source Code Cross Referenced for DiscGeneratorImpl.java in  » J2EE » Enhydra-Demos » discRack » business » disc » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Enhydra Demos » discRack.business.disc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Enhydra Java Application Server Project
003:         * 
004:         * The contents of this file are subject to the Enhydra Public License
005:         * Version 1.1 (the "License"); you may not use this file except in
006:         * compliance with the License. You may obtain a copy of the License on
007:         * the Enhydra web site ( http://www.enhydra.org/ ).
008:         * 
009:         * Software distributed under the License is distributed on an "AS IS"
010:         * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See 
011:         * the License for the specific terms governing rights and limitations
012:         * under the License.
013:         * 
014:         * The Initial Developer of the Enhydra Application Server is Lutris
015:         * Technologies, Inc. The Enhydra Application Server and portions created
016:         * by Lutris Technologies, Inc. are Copyright Lutris Technologies, Inc.
017:         * All Rights Reserved.
018:         * 
019:         * Contributor(s):
020:         * 
021:         * $Id: DiscGeneratorImpl.java,v 1.1 2006-09-11 12:31:47 sinisa Exp $
022:         */
023:
024:        package discRack.business.disc;
025:
026:        import discRack.data.disc.*;
027:        import discRack.spec.*;
028:        import discRack.business.DiscRackBusinessException;
029:        import discRack.data.person.PersonDO;
030:
031:        import com.lutris.dods.builder.generator.query.*;
032:        import com.lutris.appserver.server.sql.ObjectId;
033:        import org.enhydra.dods.exceptions.AssertionDataObjectException;
034:
035:        /**
036:         * Used to find the instances of disc.
037:         */
038:        public class DiscGeneratorImpl implements  DiscGenerator {
039:
040:            /** 
041:             * The findDiscsForPerson method performs a database query to
042:             * return an array of <CODE>Disc</CODE> objects
043:             * representing all the rows in the <CODE>disc</CODE> table
044:             * that have and owner matching <CODE>Person owner</CODE>. 
045:             *
046:             * @param owner The owner of the discs
047:             * @return
048:             *     array of discs. 
049:             * @exception DiscRackBusinessException
050:             *   If there is a problem retrieving disc information.
051:             */
052:            public Disc[] findDiscsForPerson(Person owner)
053:                    throws DiscRackBusinessException {
054:                DiscImpl[] theDiscArray = null;
055:
056:                try {
057:                    DiscQuery query = new DiscQuery();
058:                    //set query
059:                    query.setQueryOwner(PersonDO.createExisting(owner
060:                            .getHandle()));
061:                    // Order discs alphabetically by artist
062:                    query.addOrderByArtist();
063:                    DiscDO[] DOarray = query.getDOArray();
064:                    theDiscArray = new DiscImpl[DOarray.length];
065:                    for (int i = 0; i < DOarray.length; i++)
066:                        theDiscArray[i] = new DiscImpl(DOarray[i]);
067:                } catch (Exception ex) {
068:                    throw new DiscRackBusinessException(
069:                            "Exception in findDiscsForPerson()", ex);
070:                }
071:
072:                return theDiscArray;
073:            }
074:
075:            /** 
076:             * The findDiscByID method performs a database query to
077:             * return a <CODE>Disc</CODE> object
078:             * representing the row in the <CODE>disc</CODE> table
079:             * that matches the object id. 
080:             *
081:             * @param id , the object id of the disc table.
082:             * @return
083:             *    the disc. null if there isn't a person associated
084:             *    the id
085:             * @exception DiscRackBusinessException
086:             *    if there is a problem retrieving person information.
087:             */
088:            public Disc findDiscByID(String id)
089:                    throws DiscRackBusinessException {
090:                DiscImpl theDisc = null;
091:
092:                try {
093:                    DiscQuery query = new DiscQuery();
094:                    //set query
095:                    query.setQueryOId(new ObjectId(id));
096:                    // Throw an exception if more than one user by this name is found
097:                    query.requireUniqueInstance();
098:                    DiscDO theDiscDO = query.getNextDO();
099:                    theDisc = new DiscImpl(theDiscDO);
100:                    return theDisc;
101:                } catch (Exception ex) {
102:                    throw new DiscRackBusinessException(
103:                            "Exception in findDiscsByID()", ex);
104:                }
105:            }
106:
107:        }
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