es.ucm.fdi.gaia.jcolibri.test.test3

Class Test3

java.lang.Object

es.ucm.fdi.gaia.jcolibri.test.test3.Test3

All Implemented Interfaces:

StandardCBRApplication

public class Test3
extends Object
implements StandardCBRApplication

This example shows how to use a compound attribute in the description of a case and how to complete the CBR cycle.
Now, the description has not a string defining the region. Instead that, it has other bean named "Region" that stores different attributes about the region (nearest city, airport, currency...). This way, the structure of the case is:

 Case
  |
  +- Description
          |
          +- caseId
          +- HollidayType
          +- Price
          +- NumberOfPersons
          +- Region
          |     |
          |     +- regionId
          |     +- regionName
          |     +- NearestCity
          |     +- Airport
          |     +- Currency
          +- Transportation
          +- Duration
          +- Season
          +- Accomodation
          +- Hotel
 

This structure is mapped to the travelext data base that can be created using the travelext.sql file. It is composed by two tables: travel and region. Travel has a number in the regionid column identifying the row in the region table that contains the information:

 travel:
 +-----------+-------------+-------+-----------------+----------+----------------+----------+-----------+---------------+-----------------------------+
 | caseId    | HolidayType | Price | NumberOfPersons | regionId | Transportation | Duration | Season    | Accommodation | Hotel                       |
 +-----------+-------------+-------+-----------------+----------+----------------+----------+-----------+---------------+-----------------------------+
 | Journey11 | City        |  1978 |               2 |        1 | Plane          |        7 | April     | ThreeStars    | Hotel Victoria, Cairo       |
 | Journey21 | Recreation  |  1568 |               2 |        2 | Car            |       14 | May       | TwoStars      | Hotel Ostend, Belgium       |
  ...
 region:
 +----------+------------+-------------+---------------------------+----------------+
 | regionId | RegionName | NearestCity | Airport                   | Currency       |
 +----------+------------+-------------+---------------------------+----------------+
 |        1 | Cairo      | Cairo       | Cairo Airport             | Egyptian Pound |
 |        2 | Belgium    | Brussels    | Brussels National Airport | Euro           |
  ...
 

To map the case structure with the data base we have to modify these lines in hibernate.cfg.xml:

 <hibernate-mapping default-lazy="false">
   <class name="es.ucm.fdi.gaia.jcolibri.test.test3.TravelDescription" table="travel">
      ...
      <many-to-one name="Region" column="regionId" not-null="true" cascade="save-update"/> 
      ...
   </class>
   <class name="es.ucm.fdi.gaia.jcolibri.test.test3.Region" table="region">
        <id name="id" column="regionId">
        </id>
        <property name="region" column="RegionName"/>
        <property name="city" column="NearestCity"/>
        <property name="airport" column="Airport"/>
        <property name="currency" column="Currency"/>
   </class>
 </hibernate-mapping>
 

The many-to-one tag indicates the association between the regionId column in the travel table with the values of the region table.

This example also shows how to complete the CBR cycle including reuse, revise and retain methods:

• Reuse. To reuse a case we have to combine its solution with the description of the query. It is done by the method: CombineQueryAndCasesMethod.combine()
• Revise. A simple revision consists on defining new values for the ids of the compound attributes to save the new case into the persistence layer. It is done by: DefineNewIdsMethod.defineNewIdsMethod()
• Retain. Consists on saving a new case into the persistence layer. This is performed by: StoreCasesMethod.storeCase()

Version:

1.0

Author:

Juan A. Recio-Garcia

See Also:

TravelDescription, Region, jcolibri.method.reuse.CombineQueryAndCasesMethod, jcolibri.method.revise.DefineNewIdsMethod, jcolibri.method.retain.StoreCasesMethod

Constructor Summary

Constructors

Constructor and Description
Test3()

Method Summary

Modifier and Type	Method and Description
void	configure()
void	cycle(CBRQuery query)
static void	main(String[] args)
void	postCycle()
CBRCaseBase	preCycle()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Test3

public Test3()

Method Detail

configure

public void configure()
               throws ExecutionException

Specified by:

configure in interface StandardCBRApplication

Throws:

ExecutionException

preCycle

public CBRCaseBase preCycle()
                     throws ExecutionException

Specified by:

preCycle in interface StandardCBRApplication

Throws:

ExecutionException

cycle

public void cycle(CBRQuery query)
           throws ExecutionException

Specified by:

cycle in interface StandardCBRApplication

Throws:

ExecutionException

postCycle

public void postCycle()
               throws ExecutionException

Specified by:

postCycle in interface StandardCBRApplication

Throws:

ExecutionException

main

public static void main(String[] args)

Parameters:

args -