CyclicModuleDependencyException


1   package jfun.yan.xml;
2   
3   import java.io.PrintStream  ;
4   import java.io.PrintWriter  ;
5   import java.util.Stack  ;
6   
7   /**
8    * Represents an exception when module files have circular dependency.
9    * <p>
10   * @author Ben Yu
11   * Nov 20, 2005 4:28:24 PM
12   */
13  public class CyclicModuleDependencyException extends ConfigurationException {
14    private final Stack   trace = new Stack  ();
15    
16    /**
17     * Create a CyclicModuleDependencyException object.
18     * @param msg the error message.
19     * @param loc the location where the dependency cycle is detected.
20     */
21    public CyclicModuleDependencyException(String   msg, Location loc) {
22      super(msg, loc);
23    }
24  
25    /**
26     * Pushes a frame to the exception.
27     * @param obj the frame.
28     */
29    public void push(Object   obj){
30      trace.push(obj);
31    }
32    
33    /**
34     * Get the dependency trace that caused the cycle.
35     * 
36     */
37    public Stack   getDependencyTrace(){
38      return trace;
39    }
40    
41    /**
42     * Print the dependency trace.
43     * @param out the output stream.
44     */
45    public void printDependencyTrace(PrintStream   out){
46      printDependencyTrace(new java.io.PrintWriter  (out, true));
47    }
48    /**
49     * Print the dependency trace.
50     * @param out the output writer.
51     */
52    public void printDependencyTrace(java.io.PrintWriter   out){
53      final int size = trace.size();
54      for(int i=0; i<size; i++){
55        out.println(trace.get(i));
56      }
57    }
58    /**
59     * Prints the dependency trace to the standard error output.
60     */
61    public void printDependencyTrace(){
62      printDependencyTrace(System.err);
63    }
64  
65    public void printStackTrace(PrintStream   s) {
66      printDependencyTrace(s);
67      super.printStackTrace(s);
68    }
69    public void printStackTrace(PrintWriter   s) {
70      printDependencyTrace(s);
71      super.printStackTrace(s);
72    }
73  }
74
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