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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.scxml.env;
18  
19  import java.io.Serializable;
20  
21  import org.apache.commons.scxml.ErrorReporter;
22  import org.apache.commons.scxml.SCXMLListener;
23  import org.apache.commons.scxml.model.Transition;
24  import org.apache.commons.scxml.model.TransitionTarget;
25  import org.xml.sax.ErrorHandler;
26  import org.xml.sax.SAXException;
27  import org.xml.sax.SAXParseException;
28  
29  /***
30   * A simple tracer connected to Jakarta Commons Logging.
31   *
32   */
33  public class Tracer implements ErrorHandler, ErrorReporter,
34                                 SCXMLListener, Serializable {
35  
36      /*** Serial version UID. */
37      private static final long serialVersionUID = 1L;
38      /*** ErrorHandler delegate. */
39      private ErrorHandler errHandler;
40      /*** ErrorReporter delegate. */
41      private ErrorReporter errReporter;
42      /*** SCXMLListener delegate. */
43      private SCXMLListener scxmlListener;
44  
45      /***
46       * Constructor.
47       */
48      public Tracer() {
49          super();
50          errHandler = new SimpleErrorHandler();
51          errReporter = new SimpleErrorReporter();
52          scxmlListener = new SimpleSCXMLListener();
53      }
54  
55      /***
56       * @see org.xml.sax.ErrorHandler#warning(org.xml.sax.SAXParseException)
57       */
58      public void warning(final SAXParseException exception)
59      throws SAXException {
60          errHandler.warning(exception);
61      }
62  
63      /***
64       * @see org.xml.sax.ErrorHandler#error(org.xml.sax.SAXParseException)
65       */
66      public void error(final SAXParseException exception)
67      throws SAXException {
68          errHandler.error(exception);
69      }
70  
71      /***
72       * @see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)
73       */
74      public void fatalError(final SAXParseException exception)
75      throws SAXException {
76          errHandler.fatalError(exception);
77      }
78  
79      /***
80       * @see ErrorReporter#onError(String, String, Object)
81       */
82      public void onError(final String errCode, final String errDetail,
83              final Object errCtx) {
84          errReporter.onError(errCode, errDetail, errCtx);
85      }
86  
87      /***
88       * @see SCXMLListener#onEntry(TransitionTarget)
89       */
90      public void onEntry(final TransitionTarget target) {
91          scxmlListener.onEntry(target);
92      }
93  
94      /***
95       * @see SCXMLListener#onExit(TransitionTarget)
96       */
97      public void onExit(final TransitionTarget target) {
98          scxmlListener.onExit(target);
99      }
100 
101     /***
102 * @see SCXMLListener#onTransition(TransitionTarget,TransitionTarget,Transition)
103      */
104     public void onTransition(final TransitionTarget from,
105             final TransitionTarget to, final Transition transition) {
106         scxmlListener.onTransition(from, to, transition);
107     }
108 
109 }
110