AbstractUseCase


1   package org.apache.ojb.tutorial2;
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 org.odmg.Implementation;
19  
20  import java.io.BufferedReader  ;
21  import java.io.InputStreamReader  ;
22  
23  /**
24   * Base class for the use cases of tutorial 2.
25   */
26  public abstract class AbstractUseCase implements UseCase
27  {
28      /** The ODMG handle used for database operations */
29      protected Implementation odmg;
30  
31      /**
32       * Creates a new instance of the use case. Is intended to be called
33       * by sub classes.
34       * 
35       * @param odmg The odmg implementation to use
36       */
37      public AbstractUseCase(Implementation odmg)
38      {
39          this.odmg = odmg;
40      }
41  
42      /**
43       * Reads a single line from stdin and returns it.
44       * 
45       * @param message The message to print
46       * @return The text entered by the user
47       */
48      protected String   readLineWithMessage(String   message)
49      {
50          System.out.print(message + " ");
51  
52          try
53          {
54              BufferedReader   rin = new BufferedReader  (new InputStreamReader  (System.in));
55  
56              return rin.readLine();
57          }
58          catch (Exception   e)
59          {
60              return "";
61          }
62      }
63  }
64
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