NestedSlideException


1   /*
2    * $Header: /home/cvs/jakarta-slide/src/share/org/apache/slide/common/NestedSlideException.java,v 1.7 2004/07/28 09:38:17 ib Exp $
3    * $Revision: 1.7 $
4    * $Date: 2004/07/28 09:38:17 $
5    *
6    * ====================================================================
7    *
8    * Copyright 1999-2002 The Apache Software Foundation 
9    *
10   * Licensed under the Apache License, Version 2.0 (the "License");
11   * you may not use this file except in compliance with the License.
12   * You may obtain a copy of the License at
13   *
14   *     http://www.apache.org/licenses/LICENSE-2.0
15   *
16   * Unless required by applicable law or agreed to in writing, software
17   * distributed under the License is distributed on an "AS IS" BASIS,
18   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19   * See the License for the specific language governing permissions and
20   * limitations under the License.
21   *
22   */
23  
24  package org.apache.slide.common;
25  
26  import java.util.Vector  ;
27  import java.util.Enumeration  ;
28  
29  /**
30   * Nested Slide exception.
31   *
32   * @version $Revision: 1.7 $
33   */
34  public class NestedSlideException extends SlideException {
35      
36      
37      // ----------------------------------------------------------- Constructors
38      
39      
40      /**
41       * Constructor.
42       */
43      public NestedSlideException(String   message) {
44          super(message, false);
45          exceptions = new Vector  ();
46      }
47      
48      
49      // ----------------------------------------------------- Instance Variables
50      
51      
52      /**
53       * Vector of exceptions which have been put in this exception.
54       */
55      protected Vector   exceptions;
56      
57      
58      // ------------------------------------------------------------- Properties
59      
60      
61      /**
62       * Add a new nested exception.
63       *
64       * @param exception Exception to be added
65       */
66      public void addException(SlideException exception) {
67          exceptions.addElement(exception);
68      }
69      
70      
71      /**
72       * Enumerate nested exceptions.
73       *
74       * @return Enumeration nested exceptions list
75       */
76      public Enumeration   enumerateExceptions() {
77          return exceptions.elements();
78      }
79      
80      
81      /**
82       * Return the count of nested exceptions.
83       *
84       * @return int count of nested exceptions
85       */
86      public int getExceptionsCount() {
87          return exceptions.size();
88      }
89      
90      
91      
92      /**
93       * Return the count of nested exceptions.
94       *
95       * @return int count of nested exceptions
96       */
97      public SlideException unpackSingleException() {
98          if (getExceptionsCount() != 1) return null;
99          return (SlideException)enumerateExceptions().nextElement();
100     }
101     
102     
103     /**
104      * Returns true if no exceptions have been put in this exception.
105      *
106      * @return boolean
107      */
108     public boolean isEmpty() {
109         return exceptions.isEmpty();
110     }
111     
112     
113     // --------------------------------------------------------- Object Methods
114     
115     
116     /**
117      * Displays the exception message.
118      *
119      * @return String exception message
120      */
121     public String   toString() {
122         String   result = new String  ();
123         if( exceptions != null ) {
124             Enumeration   list = exceptions.elements();
125             while (list.hasMoreElements()) {
126                 SlideException e = (SlideException) list.nextElement();
127                 result = result + e.getMessage() + "\n";
128             }
129         }
130         return result;
131     }
132     
133 }
134
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