uk.org.ogsadai.client.databrowser
Class DBModel

java.lang.Object
  |
  +--java.util.Observable
        |
        +--uk.org.ogsadai.client.databrowser.DBModel

public class DBModel

extends java.util.Observable

Model for the DBClient application.

Acts as the model in the MVC pattern. It is accessed by controllers, and in turn updates views when its state changes.

In this case the model holds lists of registries and their associated factories, and updates registered observers when these lists change. It also handles the launching of queries, and notifies registered observers of the results of the queries.

Version:

$Revision: 1.10 $

Author:

Paul J Graham, EPCC, The OGSA-DAI project team

Field Summary

private static java.lang.String	COPYRIGHT_NOTICE Copyright statement
private java.util.Vector	mDataServices

Fields inherited from class java.util.Observable

Constructor Summary

DBModel()

Method Summary

void	addDataService(java.lang.String url, DBProgressModel progressModel) Adds a data service to the current list
java.util.Vector	getDataResourceIDs() Gets the resource IDs for all available data resources.
java.util.Vector	getDataServices() Gets the list of currently accessed data services.
java.util.Vector	getDataServiceURLs() Gets the URLs for all the currently accessed data services.
void	removeDataService(DBDataService service) Removes a data service from the currently accessible list and removes its associated resources.
void	retrieveSchema(DBProgressModel model, DBDataResource service) Retrieves the schema from the data resource and informs all observers.
void	runJoin(DBProgressModel pm, DBJoinParameter parameters) Runs a join.
void	updateObservers(java.lang.Object obj) Updates any Views which have registered themselves as observers of the model

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

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

Field Detail

COPYRIGHT_NOTICE

private static final java.lang.String COPYRIGHT_NOTICE

Copyright statement

See Also:

Constant Field Values

mDataServices

private java.util.Vector mDataServices

Constructor Detail

DBModel

public DBModel()

Method Detail

updateObservers

public void updateObservers(java.lang.Object obj)

Updates any Views which have registered themselves as observers of the model

Parameters:

obj - The object passed on to the observers

addDataService

public void addDataService(java.lang.String url,
                           DBProgressModel progressModel)
                    throws java.lang.Exception

Adds a data service to the current list

Parameters:

url - The URL of the data service to be added

progressModel - Follows the progress

Throws:

java.lang.Exception

removeDataService

public void removeDataService(DBDataService service)

Removes a data service from the currently accessible list and removes its associated resources.

Parameters:

service - The data service to remove.

getDataServices

public java.util.Vector getDataServices()

Gets the list of currently accessed data services.

Returns:

Vector of data services. The vector will contain objects of type DBDataService.

getDataServiceURLs

public java.util.Vector getDataServiceURLs()

Gets the URLs for all the currently accessed data services.

Returns:

Vector of URLs. The vector will contain objects of type String.

getDataResourceIDs

public java.util.Vector getDataResourceIDs()

Gets the resource IDs for all available data resources.

Returns:

Vector of resource IDs. The vector will contain objects of type String.

runJoin

public void runJoin(DBProgressModel pm,
                    DBJoinParameter parameters)
             throws java.lang.Exception

Runs a join.

Parameters:

pm - The progress monitor

parameters - The join parameters

Throws:

java.lang.Exception

retrieveSchema

public void retrieveSchema(DBProgressModel model,
                           DBDataResource service)
                    throws java.lang.Exception

Retrieves the schema from the data resource and informs all observers.

Parameters:

model - Progress model (unused)

service - The service and data resource from which to retrieve the database schema.

Throws:

java.lang.Exception - if there was a problem