CannotCreateElementProcessorException


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation.
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.apache.cocoon.components.elementprocessor;
17  
18  /**
19   * Exception to be thrown when an ElementProcessor cannot be created.
20   *
21   * @author Marc Johnson (marc_johnson27591@hotmail.com)
22   * @version CVS $Id: CannotCreateElementProcessorException.java 30932 2004-07-29 17:35:38Z vgritsenko $
23   */
24  public class CannotCreateElementProcessorException
25          extends Exception  
26  {
27      private String   _element_name;
28      private String   _reason;
29  
30      /**
31       * Constructor
32       *
33       * @param reason a simple explanation why the specified
34       *               ElementProcessor could not be created.
35       */
36  
37      public CannotCreateElementProcessorException(final String   reason)
38      {
39          _element_name = null;
40          _reason = (reason == null) ? "" : reason;
41      }
42  
43      public void setElementName(final String   name)
44      {
45          _element_name = name;
46      }
47  
48      /**
49       * override of Throwable's getMessage; allows us to format it
50       * with the element name
51       *
52       * @return a succinct but useful message describing the
53       *         problem and which element name we couldn't handle.
54       */
55  
56      public String   getMessage()
57      {
58          StringBuffer   buffer = new StringBuffer  ();
59  
60          buffer.append("Could not create ElementProcessor for element ");
61          buffer.append(_element_name);
62          buffer.append(" ");
63          if (_reason.length() != 0) {
64              buffer.append("(").append(_reason).append(")");
65          }
66          return buffer.toString();
67      }
68  }   // end public class CannotCreateElementProcessorException
69
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