package org.apache.ojb.broker.prevayler.demo;
/* Copyright 2003-2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import org.apache.ojb.broker.PersistenceBroker;
import org.apache.ojb.broker.PersistenceBrokerFactory;
import org.apache.ojb.broker.util.ui.AsciiSplash;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Vector;
/**
* The tutorial application.
* @author Thomas Mahler
*/
public class Application
{
private Vector useCases;
private PersistenceBroker broker;
/**
* Application constructor comment.
*/
public Application()
{
broker = null;
try
{
broker = PersistenceBrokerFactory.defaultPersistenceBroker();
}
catch (Throwable t)
{
t.printStackTrace();
}
useCases = new Vector();
useCases.add(new UCListAllProducts(broker));
useCases.add(new UCEnterNewProduct(broker));
useCases.add(new UCEditProduct(broker));
useCases.add(new UCDeleteProduct(broker));
useCases.add(new UCQuitApplication(broker));
}
/**
* Disply available use cases.
*/
public void displayUseCases()
{
System.out.println();
for (int i = 0; i < useCases.size(); i++)
{
System.out.println("[" + i + "] " + ((UseCase) useCases.get(i)).getDescription());
}
}
/**
* Insert the method's description here.
* Creation date: (04.03.2001 10:40:25)
* @param args java.lang.String[]
*/
public static void main(String[] args)
{
Application app = new Application();
app.run();
}
/**
* read a single line from stdin and return as String
*/
private String readLine()
{
try
{
BufferedReader rin = new BufferedReader(new InputStreamReader(System.in));
return rin.readLine();
}
catch (Exception e)
{
return "";
}
}
/**
* the applications main loop.
*/
public void run()
{
System.out.println(AsciiSplash.getSplashArt());
System.out.println("Welcome to the OJB PB tutorial application");
System.out.println();
// never stop (there is a special use case to quit the application)
while (true)
{
try
{
// select a use case and perform it
UseCase uc = selectUseCase();
uc.apply();
}
catch (Throwable t)
{
broker.close();
System.out.println(t.getMessage());
}
}
}
/**
* select a use case.
*/
public UseCase selectUseCase()
{
displayUseCases();
System.out.println("type in number to select a use case");
String in = readLine();
int index = Integer.parseInt(in);
return (UseCase) useCases.get(index);
}
}
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