AbstractUseCase


1   package org.apache.ojb.tutorial5;
2   
3   /* Copyright 2002-2004 The Apache Software Foundation
4    *
5    * Licensed under the Apache License, Version 2.0 (the "License");
6    * you may not use this file except in compliance with the License.
7    * You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  import javax.jdo.PersistenceManagerFactory;
19  
20  import java.io.BufferedReader  ;
21  import java.io.InputStreamReader  ;
22  
23  /**
24   * Base class for the use cases of tutorial 5.
25   */
26  public abstract class AbstractUseCase implements UseCase
27  {
28      /** The persistence manager factory used to acquire persistence managers
29          for database operations */
30      protected PersistenceManagerFactory factory;
31  
32      /**
33       * Creates a new instance of the use case. Is intended to be called
34       * by sub classes.
35       * 
36       * @param factory The factory for getting persistence managers
37       */
38      public AbstractUseCase(PersistenceManagerFactory factory)
39      {
40          this.factory = factory;
41      }
42  
43      /**
44       * Reads a single line from stdin and returns it.
45       * 
46       * @param message The message to print
47       * @return The text entered by the user
48       */
49      protected String   readLineWithMessage(String   message)
50      {
51          System.out.print(message + " ");
52  
53          try
54          {
55              BufferedReader   rin = new BufferedReader  (new InputStreamReader  (System.in));
56  
57              return rin.readLine();
58          }
59          catch (Exception   e)
60          {
61              return "";
62          }
63      }
64  }
65
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