ExceptionConverter


1   /*
2    * Copyright 2005 Joe Walker
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.directwebremoting.convert;
17  
18  import java.beans.IntrospectionException  ;
19  import java.beans.PropertyDescriptor  ;
20  import java.util.Map  ;
21  
22  import org.directwebremoting.extend.MarshallException;
23  import org.directwebremoting.impl.PropertyDescriptorProperty;
24  
25  /**
26   * A special case of BeanConverter that doesn't convert StackTraces
27   * @author Joe Walker [joe at getahead dot ltd dot uk]
28   */
29  public class ExceptionConverter extends BeanConverter
30  {
31      /* (non-Javadoc)
32       * @see org.directwebremoting.convert.BasicBeanConverter#getPropertyDescriptors(java.lang.Class, boolean, boolean)
33       */
34      public Map   getPropertyMapFromClass(Class   type, boolean readRequired, boolean writeRequired) throws MarshallException
35      {
36          Map   descriptors = super.getPropertyMapFromClass(type, readRequired, writeRequired);
37          descriptors.put("javaClassName", new PlainProperty("javaClassName", type.getName()));
38  
39          // Make sure Throwable's standard properties are added
40          // (fix for Bean Introspector peculiarities)
41          try
42          {
43              fixMissingThrowableProperty(descriptors, "message", "getMessage");
44              fixMissingThrowableProperty(descriptors, "cause", "getCause");
45          }
46          catch (IntrospectionException   ex)
47          {
48              throw new MarshallException(type, ex);
49          }
50  
51          return descriptors;
52      }
53  
54      /**
55       * Make sure Throwable's standard properties are added
56       * (fix for Bean Introspector peculiarities)
57       * @param descriptors The Map of the known descriptors
58       * @param name The name of the property to add
59       * @param readMethodName A method name to use when getting said property
60       * @throws IntrospectionException If we fail to build a PropertyDescriptor
61       */
62      protected void fixMissingThrowableProperty(Map   descriptors, String   name, String   readMethodName) throws IntrospectionException  
63      {
64          if (!descriptors.containsKey(name) && isAllowedByIncludeExcludeRules(name))
65          {
66              PropertyDescriptor   descriptor = new PropertyDescriptor  (name, Throwable  .class, readMethodName, null);
67              descriptors.put(name, new PropertyDescriptorProperty(descriptor));
68          }
69      }
70  }
71
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