001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.scxml.env;
018    
019    import java.io.Serializable;
020    
021    import org.apache.commons.scxml.ErrorReporter;
022    import org.apache.commons.scxml.SCXMLListener;
023    import org.apache.commons.scxml.model.Transition;
024    import org.apache.commons.scxml.model.TransitionTarget;
025    import org.xml.sax.ErrorHandler;
026    import org.xml.sax.SAXException;
027    import org.xml.sax.SAXParseException;
028    
029    /**
030     * A simple tracer connected to Apache Commons Logging.
031     *
032     */
033    public class Tracer implements ErrorHandler, ErrorReporter,
034                                   SCXMLListener, Serializable {
035    
036        /** Serial version UID. */
037        private static final long serialVersionUID = 1L;
038        /** ErrorHandler delegate. */
039        private ErrorHandler errHandler;
040        /** ErrorReporter delegate. */
041        private ErrorReporter errReporter;
042        /** SCXMLListener delegate. */
043        private SCXMLListener scxmlListener;
044    
045        /**
046         * Constructor.
047         */
048        public Tracer() {
049            super();
050            errHandler = new SimpleErrorHandler();
051            errReporter = new SimpleErrorReporter();
052            scxmlListener = new SimpleSCXMLListener();
053        }
054    
055        /**
056         * @see org.xml.sax.ErrorHandler#warning(org.xml.sax.SAXParseException)
057         */
058        public void warning(final SAXParseException exception)
059        throws SAXException {
060            errHandler.warning(exception);
061        }
062    
063        /**
064         * @see org.xml.sax.ErrorHandler#error(org.xml.sax.SAXParseException)
065         */
066        public void error(final SAXParseException exception)
067        throws SAXException {
068            errHandler.error(exception);
069        }
070    
071        /**
072         * @see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)
073         */
074        public void fatalError(final SAXParseException exception)
075        throws SAXException {
076            errHandler.fatalError(exception);
077        }
078    
079        /**
080         * @see ErrorReporter#onError(String, String, Object)
081         */
082        public void onError(final String errCode, final String errDetail,
083                final Object errCtx) {
084            errReporter.onError(errCode, errDetail, errCtx);
085        }
086    
087        /**
088         * @see SCXMLListener#onEntry(TransitionTarget)
089         */
090        public void onEntry(final TransitionTarget target) {
091            scxmlListener.onEntry(target);
092        }
093    
094        /**
095         * @see SCXMLListener#onExit(TransitionTarget)
096         */
097        public void onExit(final TransitionTarget target) {
098            scxmlListener.onExit(target);
099        }
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