NestedException


1   package org.crazybob.util;
2   
3   import java.io.*;
4   
5   /**
6    * Turns a nested exception into a runtime exception. Shields client
7    * from vendor-specific implementations. Use for exceptions that you don't
8    * know how to or shouldn't handle in your code. Maintains original
9    * exception's message and stack trace.
10   *
11   * @author Bob Lee (crazybob@crazybob.org)
12   */
13  public class NestedException extends RuntimeException   {
14  
15      /** Wrap another exeception in a RuntimeException. */
16      public static RuntimeException   wrap(Throwable   t) {
17          if (t instanceof RuntimeException  ) return (RuntimeException  ) t;
18          return new NestedException(t);
19      }
20  
21      private String   message;
22      private String   stackTrace;
23  
24      /** Wraps another exeception. */
25      private NestedException(Throwable   t) {
26          super();
27          this.message = t.getMessage();
28          StringWriter out = new StringWriter();
29          t.printStackTrace(new PrintWriter(out));
30          this.stackTrace = out.toString();
31      }
32  
33      public String   toString() {
34          return this.getMessage();
35      }
36  
37      public String   getMessage() {
38          return this.message;
39      }
40  
41      public void printStackTrace() {
42          System.err.print(this.stackTrace);
43      }
44  
45      public void printStackTrace(PrintStream out) {
46          printStackTrace(new PrintWriter(out));
47      }
48  
49      public void printStackTrace(PrintWriter out) {
50          out.print(this.stackTrace);
51      }
52  
53  }
54

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