NestedExceptionUtils


1   /*
2    * Copyright 2002-2006 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.core;
18  
19  /**
20   * Helper class for implementing exception classes which are capable of
21   * holding nested exceptions. Necessary because we can't share a base
22   * class among different exception types.
23   *
24   * <p>Mainly for use within the framework.
25   *
26   * @author Juergen Hoeller
27   * @since 2.0
28   * @see NestedRuntimeException
29   * @see NestedCheckedException
30   * @see NestedIOException
31   * @see org.springframework.web.util.NestedServletException
32   */
33  public abstract class NestedExceptionUtils {
34  
35      /**
36       * Build a message for the given base message and root cause.
37       * @param message the base message
38       * @param cause the root cause
39       * @return the full exception message
40       */
41      public static String   buildMessage(String   message, Throwable   cause) {
42          if (cause != null) {
43              StringBuffer   buf = new StringBuffer  ();
44              if (message != null) {
45                  buf.append(message).append("; ");
46              }
47              buf.append("nested exception is ").append(cause);
48              return buf.toString();
49          }
50          else {
51              return message;
52          }
53      }
54  
55  }
56
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