ErrorBean


1   /*
2    * Copyright (C) 2005 Alfresco, Inc.
3    *
4    * Licensed under the Mozilla Public License version 1.1 
5    * with a permitted attribution clause. You may obtain a
6    * copy of the License at
7    *
8    *   http://www.alfresco.org/legal/license.txt
9    *
10   * Unless required by applicable law or agreed to in writing,
11   * software distributed under the License is distributed on an
12   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific
14   * language governing permissions and limitations under the
15   * License.
16   */
17  package org.alfresco.web.bean;
18  
19  import java.io.PrintWriter  ;
20  import java.io.StringWriter  ;
21  
22  import javax.servlet.ServletException  ;
23  
24  /**
25   * Bean used by the error page, holds the last exception to be thrown by the system
26   * 
27   * @author gavinc
28   */
29  public class ErrorBean
30  {
31     public static final String   ERROR_BEAN_NAME = "alfresco.ErrorBean";
32     
33     private String   returnPage;
34     private Throwable   lastError;
35  
36     /**
37      * @return Returns the page to go back to after the error has been displayed
38      */
39     public String   getReturnPage()
40     {
41        return returnPage;
42     }
43  
44     /**
45      * @param returnPage The page to return to after showing the error
46      */
47     public void setReturnPage(String   returnPage)
48     {
49        this.returnPage = returnPage;
50     }
51  
52     /**
53      * @return Returns the lastError.
54      */
55     public Throwable   getLastError()
56     {
57        return lastError;
58     }
59  
60     /**
61      * @param lastError The lastError to set.
62      */
63     public void setLastError(Throwable   lastError)
64     {
65        this.lastError = lastError;
66     }
67     
68     /**
69      * @return Returns the last error to occur in string form
70      */
71     public String   getLastErrorMessage()
72     {
73        String   message = "No error currently stored";
74        
75        if (this.lastError != null)
76        {
77           StringBuilder   builder = null;
78           Throwable   cause = null;
79           if (this.lastError instanceof ServletException   && 
80               ((ServletException  )this.lastError).getRootCause() != null)
81           {
82              // servlet exception puts the actual error in root cause!!
83              Throwable   actualError = ((ServletException  )this.lastError).getRootCause();
84              builder = new StringBuilder  (actualError.toString());
85              cause = actualError.getCause();
86           }
87           else
88           {
89              builder = new StringBuilder  (this.lastError.toString());
90              cause = this.lastError.getCause(); 
91           }
92           
93           while (cause != null)
94           {
95              builder.append("<br/><br/>caused by:<br/>");
96              builder.append(cause.toString());
97              
98              if (cause instanceof ServletException   && 
99               ((ServletException  )cause).getRootCause() != null)
100             {
101                cause = ((ServletException  )cause).getRootCause();
102             }
103             else
104             {
105                cause = cause.getCause();
106             }  
107          }
108          
109          message = builder.toString();
110       }
111       
112       return message;
113    }
114    
115    /**
116     * @return Returns the stack trace for the last error
117     */
118    public String   getStackTrace()
119    {
120       StringWriter   stringWriter = new StringWriter  ();
121       PrintWriter   writer = new PrintWriter  (stringWriter);
122       
123       if (this.lastError instanceof ServletException   && 
124           ((ServletException  )this.lastError).getRootCause() != null)
125       {
126          Throwable   actualError = ((ServletException  )this.lastError).getRootCause();
127          actualError.printStackTrace(writer);
128       }
129       else
130       {
131          this.lastError.printStackTrace(writer);
132       }
133       
134       return stringWriter.toString().replaceAll("\r\n", "<br/>");
135    }
136 }
137
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