org.argeo.cms/src/org/argeo/cms/util/ExceptionsChain.java

   1 package org.argeo.cms.util;
   2
   3 import java.util.ArrayList;
   4 import java.util.List;
   5
   6 /**
   7  * Serialisable wrapper of a {@link Throwable}. typically to be written as XML
   8  * or JSON in a server error response.
   9  */
  10 public class ExceptionsChain {
  11         private List<SystemException> exceptions = new ArrayList<>();
  12
  13         public ExceptionsChain() {
  14         }
  15
  16         public ExceptionsChain(Throwable exception) {
  17                 writeException(exception);
  18         }
  19
  20         /** recursive */
  21         protected void writeException(Throwable exception) {
  22                 SystemException systemException = new SystemException(exception);
  23                 exceptions.add(systemException);
  24                 Throwable cause = exception.getCause();
  25                 if (cause != null)
  26                         writeException(cause);
  27         }
  28
  29         public List<SystemException> getExceptions() {
  30                 return exceptions;
  31         }
  32
  33         public void setExceptions(List<SystemException> exceptions) {
  34                 this.exceptions = exceptions;
  35         }
  36
  37         /** An exception in the chain. */
  38         public static class SystemException {
  39                 private String type;
  40                 private String message;
  41                 private List<String> stackTrace;
  42
  43                 public SystemException() {
  44                 }
  45
  46                 public SystemException(Throwable exception) {
  47                         this.type = exception.getClass().getName();
  48                         this.message = exception.getMessage();
  49                         this.stackTrace = new ArrayList<>();
  50                         StackTraceElement[] elems = exception.getStackTrace();
  51                         for (int i = 0; i < elems.length; i++)
  52                                 stackTrace.add("at " + elems[i].toString());
  53                 }
  54
  55                 public String getType() {
  56                         return type;
  57                 }
  58
  59                 public void setType(String type) {
  60                         this.type = type;
  61                 }
  62
  63                 public String getMessage() {
  64                         return message;
  65                 }
  66
  67                 public void setMessage(String message) {
  68                         this.message = message;
  69                 }
  70
  71                 public List<String> getStackTrace() {
  72                         return stackTrace;
  73                 }
  74
  75                 public void setStackTrace(List<String> stackTrace) {
  76                         this.stackTrace = stackTrace;
  77                 }
  78
  79                 @Override
  80                 public String toString() {
  81                         return "System exception: " + type + ", " + message + ", " + stackTrace;
  82                 }
  83
  84         }
  85
  86         @Override
  87         public String toString() {
  88                 return exceptions.toString();
  89         }
  90 }