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.logging.Log;
022    import org.apache.commons.logging.LogFactory;
023    import org.xml.sax.ErrorHandler;
024    import org.xml.sax.SAXParseException;
025    
026    /**
027     * Custom error handler that logs the parsing errors in the
028     * SCXML document.
029     */
030    public class SimpleErrorHandler implements ErrorHandler, Serializable {
031    
032        /** Serial version UID. */
033        private static final long serialVersionUID = 1L;
034        /** Message prefix. */
035        private static final String MSG_PREFIX = "SCXML SAX Parsing: ";
036        /** Message postfix. */
037        private static final String MSG_POSTFIX = " Correct the SCXML document.";
038    
039        /** Log. */
040        private Log log = LogFactory.getLog(getClass());
041    
042        /**
043         * Constructor.
044         */
045        public SimpleErrorHandler() {
046            super();
047        }
048    
049        /**
050         * @see ErrorHandler#error(SAXParseException)
051         */
052        public void error(final SAXParseException exception) {
053            if (log.isErrorEnabled()) {
054                log.error(MSG_PREFIX + exception.getMessage() + MSG_POSTFIX,
055                    exception);
056            }
057        }
058    
059        /**
060         * @see ErrorHandler#fatalError(SAXParseException)
061         */
062        public void fatalError(final SAXParseException exception) {
063            if (log.isFatalEnabled()) {
064                log.fatal(MSG_PREFIX + exception.getMessage() + MSG_POSTFIX,
065                    exception);
066            }
067        }
068    
069        /**
070         * @see ErrorHandler#warning(SAXParseException)
071         */
072        public void warning(final SAXParseException exception) {
073            if (log.isWarnEnabled()) {
074                log.warn(MSG_PREFIX + exception.getMessage() + MSG_POSTFIX,
075                    exception);
076            }
077        }
078    }
079