RollerException


1   
2   package org.roller;
3   
4   import java.io.PrintStream  ;
5   import java.io.PrintWriter  ;
6   
7   /**
8    * Roller services interfaces throw this exception.
9    */ 
10  public class RollerException extends Exception  
11  {
12      private Throwable   mRootCause = null;
13      
14      /**
15       * Construct RollerException, wrapping existing throwable.
16       * @param s Error message
17       * @param t Existing connection to wrap.
18       */
19      public RollerException(String   s,Throwable   t)
20      {
21          super(s);
22          mRootCause = t;
23      }
24      /**
25       * Construct RollerException, wrapping existing throwable.
26       * @param t Existing exception to be wrapped.
27       */
28      public RollerException(Throwable   t)
29      {
30          mRootCause = t;
31      }
32      /**
33       * Construct RollerException with message string.
34       * @param s Error message string.
35       */
36      public RollerException(String   s)
37      {
38          super(s);
39      }
40      /**
41       * Construct emtpy exception object.
42       */
43      public RollerException()
44      {
45          super();
46      }
47      /**
48       * Get root cause object, or null if none.
49       * @return Root cause or null if none.
50       */
51      public Throwable   getRootCause()
52      {
53          return mRootCause;
54      }
55     
56      /**
57       * Print stack trace for exception and for root cause exception if htere is one.
58       * @see java.lang.Throwable#printStackTrace()
59       */
60      public void printStackTrace()
61      {
62          super.printStackTrace();
63          if (mRootCause != null)
64          {
65              System.out.println("--- ROOT CAUSE ---");
66              mRootCause.printStackTrace();
67          }
68      }
69  
70      /**
71       * Print stack trace for exception and for root cause exception if htere is one.
72       * @param s Stream to print to.
73       */
74      public void printStackTrace(PrintStream   s)
75      {
76          super.printStackTrace(s);
77          if (mRootCause != null)
78          {
79              s.println("--- ROOT CAUSE ---");
80              mRootCause.printStackTrace(s);
81          }
82      }
83  
84      /**
85       * Print stack trace for exception and for root cause exception if htere is one.
86       * @param s Writer to write to.
87       */
88      public void printStackTrace(PrintWriter   s)
89      {
90         super.printStackTrace(s);
91         if (null != mRootCause) 
92         {
93             s.println("--- ROOT CAUSE ---");
94             mRootCause.printStackTrace(s);
95         }
96      }
97  
98      /**
99       * Get root cause message.
100      * @return Root cause message.
101      */
102     public String   getRootCauseMessage() 
103     {
104         String   rcmessage = null;
105         if (getRootCause()!=null) 
106         {
107             if (getRootCause().getCause()!=null)
108             {
109                 rcmessage = getRootCause().getCause().getMessage();
110             }
111             rcmessage = (rcmessage == null) ? getRootCause().getMessage() : rcmessage;
112             rcmessage = (rcmessage == null) ? super.getMessage() : rcmessage;
113             rcmessage = (rcmessage == null) ? "NONE" : rcmessage;
114         }
115         return rcmessage;
116     }
117 }
118 
119
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