1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  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  package javax.jdo.util;
19  
20  import java.io.PrintStream;
21  
22  import javax.jdo.Constants;
23  
24  import junit.framework.TestCase;
25  
26  /** */
27  public abstract class AbstractTest extends TestCase implements Constants {
28  
29      /** */
30      protected static PrintStream out = System.out;
31      
32      /** If true, print extra messages. */
33      protected boolean verbose;
34  
35      /**
36       * Construct and initialize from properties.
37       */
38      protected AbstractTest() {
39          super(null);
40          verbose = Boolean.getBoolean("verbose");
41      }
42      
43      /**
44       * Determine if a class is loadable in the current environment.
45       */
46      protected static boolean isClassLoadable(String className) {
47          try {
48              Class.forName(className);
49              return true;
50          } catch (ClassNotFoundException ex) {
51              return false;
52          }
53      }
54      
55      /**
56       */
57      protected void println(String s) {
58          if (verbose) 
59              out.println(s);
60      }
61      
62      /** New line.
63       */
64      public static final String NL = System.getProperty("line.separator");
65      
66      /** A buffer of of error messages.
67       */
68      protected static StringBuffer messages;
69      
70      /** Appends to error messages.
71       */
72      protected static synchronized void appendMessage(String message) {
73          if (message != null) {
74              if (messages == null) {
75                  messages = new StringBuffer();
76              }
77              messages.append(message);
78              messages.append(NL);
79          }
80      }
81      
82      /**
83       * Returns collected error messages, or <code>null</code> if there
84       * are none, and clears the buffer.
85       */
86      protected static synchronized String retrieveMessages() {
87          if (messages == null) {
88              return null;
89          }
90          final String msg = messages.toString();
91          messages = null;
92          return msg;
93      }
94      
95      /** 
96       * Fail the test if there are any error messages.
97       */
98      protected void failOnError() {
99          String errors = retrieveMessages();
100         if (errors != null) {
101             fail (errors);
102         }
103     }
104 }
105