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1   /*
2    * $Id: ExceptionUtils.java 19229 2010-08-26 20:50:55Z tcarlson $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.util;
12  
13  import java.util.List;
14  import java.util.ListIterator;
15  
16  /**
17   * Mule exception utilities.
18   */
19  public class ExceptionUtils extends org.apache.commons.lang.exception.ExceptionUtils
20  {
21  
22      /**
23       * This method returns true if the throwable contains a {@link Throwable} that
24       * matches the specified class or subclass in the exception chain. Subclasses of
25       * the specified class do match.
26       * 
27       * @param throwable the throwable to inspect, may be null
28       * @param type the type to search for, subclasses match, null returns false
29       * @return the index into the throwable chain, false if no match or null input
30       */
31      public static boolean containsType(Throwable throwable, Class<?> type)
32      {
33          return indexOfType(throwable, type) > -1;
34      }
35  
36      /**
37       * This method returns the throwable closest to the root cause that matches the
38       * specified class or subclass. Any null argument will make the method return
39       * null.
40       * 
41       * @param throwable the throwable to inspect, may be null
42       * @param type the type to search for, subclasses match, null returns null
43       * @return the throwablethat is closest to the root in the throwable chain that
44       *         matches the type or subclass of that type.
45       */
46      public static Throwable getDeepestOccurenceOfType(Throwable throwable, Class<?> type)
47      {
48          if (throwable == null || type == null)
49          {
50              return null;
51          }
52          @SuppressWarnings("unchecked")
53          List<Throwable> throwableList = getThrowableList(throwable);
54          ListIterator<Throwable> listIterator = throwableList.listIterator(throwableList.size());
55          while (listIterator.hasPrevious())
56          {
57              Throwable candidate = listIterator.previous();
58              if (type.isAssignableFrom(candidate.getClass()))
59              {
60                  return candidate;
61              }
62          }
63          return null;
64      }
65  }